Mahieddine Lahoubi | Badji Mokhtar - Annaba University (original) (raw)
Papers by Mahieddine Lahoubi
Instrumentation Science & Technology, 2021
Abstract A polarization beam splitter (PBS) based on a magnetic fluid-filled dual-core photonic c... more Abstract A polarization beam splitter (PBS) based on a magnetic fluid-filled dual-core photonic crystal fiber is characterized. This is the first time that anisotropy of magnetic fluid is applied to the fiber polarization beam splitter. The designed device is able to separate x and y polarization modes completely by applying an external magnetic field. When the length of the device is 9.905 mm (or 16.795 mm), the maximum bandwidth of the effective working wavelength is 26 nm (or 70 nm) and the tunable magnetic field width is approximately 5 Oe (or 165 Oe) corresponding to magnetic field range from 24 to 29 Oe (or 135 to 300 Oe). By tuning the external magnetic field, the proposed beam splitter may be selected to operate in the S, C, and L bands, and the working wavelength bandwidth and center wavelength are tunable.
IOP Conference Series: Materials Science and Engineering, 2020
This work is aimed to study the influence of the replacement of the magnetic cations Tb3+ by diam... more This work is aimed to study the influence of the replacement of the magnetic cations Tb3+ by diamagnetic cations Y3+ on the low-temperature point’, TB predicted by Belov for ferrimagnets with and without magnetic compensation point, Tcomp. Isothermal magnetizations, MT(H) are carried out on single crystals of two mixed terbium-yttrium ferrite garnets TbxY3-xFe5O12 (x = 1.98 and 0.37). The measurements are performed using DC magnetic field, H up to 80 kOe applied along the <111> and <100> crystallographic directions in the 1.5-300 temperature range. From the approximation to the second order of H, the expansion of MT(H) is analyzed on the basis of the T-dependences of the spontaneous magnetization, MS, the paraprocess magnetic susceptibility, χp and the parameter, |b| of the bH2 term. The manifestation of ferromagnetic-and antiferromagnetic-type low-temperature paraprocess and other concomitant effects is observed in the temperature dependences of the derivative, dMS/dT w...
Nanophotonics
A novel fiber-optic vector magnetic field sensor and its sensing quality dependent of fabrication... more A novel fiber-optic vector magnetic field sensor and its sensing quality dependent of fabrication method has been proposed and investigated. The proposed sensor has two surfaces on the tip of a multimode fiber, which is used as the sensing probe. By plating different thickness of gold film on the surfaces, surface plasmon resonance (SPR) can be generated and the signal can be reflected by the surfaces as well. Meanwhile, magnetic fluid (MF) as the magnetic field sensitive material is packed around the sensing probe. The experimental results prove that the response of MF to external magnetic field can be used to sense magnetic field intensity and direction via monitoring the dip wavelength of SPR. The obtained refractive index (RI) sensitivities are 2105 nm/RIU (RI range: 1.332–1.365) and 6692 nm/RIU (RI range: 1.372–1.411), magnetic field intensity sensitivities are 11.67 nm/mT (0°), and −0.47 nm/mT (90°). Besides, the proposed sensing probe is ultracompact and the footprint is extr...
Optics Express
Fiber-optic magnetic field sensors based on magnetic fluid (MF) is encountering with thermal effe... more Fiber-optic magnetic field sensors based on magnetic fluid (MF) is encountering with thermal effects and demand for vectorization for several years. A common solution is to use axially processed fiber cascaded with fiber Bragg grating (FBG). However, the length of such sensors is usually in centimeter-level, which restricts the sensing applications in narrow space and gradient field cases. In this work, we present an ultracompact reflection-type dual-channel sensor for vector magnetic field (Channel 1, referred as CH1) and temperature (Channel 2, referred as CH2) monitoring, which is composed of a pair of gold-plated wedge-shaped multimode fiber (MMF) tip and gold-plated multimode-no-core fiber (MNF) tip. The surface plasmon resonance (SPR) effect was adopted. The two sensor probes are coated with magnetic-field-sensitive MF and temperature-sensitive polydimethylsiloxane (PDMS), respectively. The issue of vector magnetic field and temperature cross-sensitivity is tactfully resolved....
2019 18th International Conference on Optical Communications and Networks (ICOCN), 2019
In this paper, a kind of magnetic photonic crystal fiber of Yttrium iron garnet (YIG) is presente... more In this paper, a kind of magnetic photonic crystal fiber of Yttrium iron garnet (YIG) is presented. The influence of gyrotropy on TE-TM mode conversion is analysed, which depends on Faraday rotation. The structure parameters are simulated and optimized. The optimum efficiency of 93.57% is obtained. Faraday rotation and modal birefringence have been calculated by varying gyrotropy from 0.01 to 0.04. The numerical results reveal an increased Faraday rotation and a reduced modal birefringence of 10-5. The enhanced properties of the structure could improve photonic devices performance, which make it suitable for magneto-optical isolators.
Journal of Physics: Conference Series, 2019
In this work, a polarization-independent waveguide based on magnetic photonic crystal (MPC) with ... more In this work, a polarization-independent waveguide based on magnetic photonic crystal (MPC) with a triangular lattice of air holes in Yttrium Iron Garnet (YIG) slab grown on alumina (Al2O3) substrate is proposed, where both TE-like and TM-like periodic band gaps overlap. YIG is well known for its attracting magneto-optical (MO) properties and used to produce a coupling between the TE and TM modes. Thus, a nonreciprocal effect can be obtained by applying an external magnetic field parallel to the direction of propagation. At 1550 nm, the complete photonic band gap is simulated and optimized using the three dimensional plane-wave expansion method. The aim of this study is to enhance Faraday rotation (FR) while maintaining a low modal birefringence. A numerical analysis in function of magnetic gyration (g) has been reported, using the BeamProp software. The results reveal a proportional relation between FR, Δ n and g, such for g = 0.5, a large FR of 26.11×104 °/cm with Δ n = 7×10−6. Th...
IEEE Sensors Journal, 2017
Two kinds of magnetic field sensors based on Sagnac loop and knot resonator configurations with m... more Two kinds of magnetic field sensors based on Sagnac loop and knot resonator configurations with microfiber coupling structures are proposed and investigated experimentally. The designed sensors are made from the microfiber coupler, whose coupling region is coated with magnetic fluid. The as-fabricated sensors have the same sensing/coupling region, but the achieved sensitivities are greatly different, which are 19.4 pm/Oe and 171.8 pm/Oe for the microfiber Sagnac loop and microfiber knot resonator structures, respectively. Comparing with the microfiber Sagnac loop and other similar microfiber knot resonator (or silicon microring) sensing structures, the sensitivity of the as-designed microfiber knot resonator sensing structure is enhanced significantly. The underlying mechanisms are expounded physically in terms of the microscopic formation of the coupling region and the essence of interference for the microfiber knot resonator structure. The designed structures could potentially lead to highly sensitive magnetic field sensors and other new-fashioned magneto-optical photonic devices.
Optics express, Jan 13, 2015
A kind of reflective all-fiber magnetic field sensor based on a non-adiabatically tapered microfi... more A kind of reflective all-fiber magnetic field sensor based on a non-adiabatically tapered microfiber with magnetic fluid is proposed and experimentally demonstrated. The modal interference effect is caused by the abrupt tapers, which result in an approximately sinusoidal spectral response. The reflection spectra of the proposed sensor under different magnetic field strengths have been measured and theoretically analyzed. The maximum sensitivity of 174.4 pm/Oe is achieved at wavelength of around 1511 nm. Besides, an intensity tunability of -0.02 dB/Oe is also achieved. Comparing with the traditional sensors operating at transmission mode, the presented sensor in this work owns the advantages of smaller size and higher sensitivity and resolution due to the enhanced extinction ratio. The proposed structure is also promising for designing other tunable all-in-fiber photonic devices.
Optics Express, 2021
A novel, compact, and easy fabrication vector magnetic field sensor has been proposed and investi... more A novel, compact, and easy fabrication vector magnetic field sensor has been proposed and investigated. The proposed sensor consists of a U-bent single-mode fiber fixed in a magnetic-fluid-filled vessel. Neither mechanical modification nor additional fiber grating is needed during the sensor fabrication. The results show that the response of magnetic fluid to magnetic field can be used to measure the direction and intensity of magnetic field via whispering gallery modes supported by the U-bent fiber structure with suitable bending radius. The sensitivity of direction is 0.251 nm/°, and the maximum magnetic field intensity sensitivity is 0.517 nm/mT. Besides, the results of this work prove the feasibility for realizing vector magnetic sensors based on other bending structures (such as bending multimode interference, bending SPR structure) in the future.
Applied Surface Science, 2016
IEEE Transactions on Applied Superconductivity, 2016
IEEE Transactions on Magnetics, 2015
Journal of Magnetism and Magnetic Materials, 2015
Using single crystals of terbium iron garnet (TbIG), magnetic properties were studied in high dc ... more Using single crystals of terbium iron garnet (TbIG), magnetic properties were studied in high dc magnetic fields up to 200 kOe, within the 4. 2 to 300 K temperature range. Two kinds of magnetic behavior were found in the two regions separated by the compensation temperature, 244 ± 2 K. Above Tcomp, the ferrimagnetic model was verified. Below Tcomp, the exchange anisotropy associated with the "double umbrella" magnetic structure became important. In the case of H parallel to the [100] direction, two distinct transitions were observed below 20 K. The experimental results obtained in both dc and pulsed fields were compared, and the differences are discussed here.
Journal of Magnetism and Magnetic Materials, 2015
ABSTRACT This paper is devoted to the description of the magnetic phase diagrams (MPD) together w... more ABSTRACT This paper is devoted to the description of the magnetic phase diagrams (MPD) together with a special interest to the determination of more precise values of some reliable parameters at the compensation point, Tcomp=243.5 5±0.5 K of the terbium iron garnet, Tb3Fe5O12 or TbIG. Using isothermal magnetizations performed on single crystal in strong dc magnetic fields up to 200 kOe applied along the <111>, <110> and <100> directions within the temperature range 128-295 K, field-induced phase transitions between collinear and canted phases are observed in the vicinity of Tcomp at critical fields, Hc2. By comparison with the measurement at zero external magnetic field, the specific heat, Cp(T) at 80 kOe along <111> shows an excess around Tcomp characterized by an anomaly with a width in the boundaries of the canted phase and a maximum at 252 K, the more accurate value of the critical temperature, TC⁎ of the MPD in the (Hc2-T) plane. Better determinations of the molecular field coefficients which represent the magnetic interactions on the Tb sublattice are obtained by an improved molecular field model based on the saturation effects of the Tb sublattice and the differential susceptibility contribution due to the Fe sublattices to the total magnetic susceptibility of TbIG. The results are discussed in terms of the previous theoretical studies of the MPD predicted for weakly anisotropic ferrimagnets.
Physica B: Condensed Matter, 2015
Neutron Diffraction, 2012
Physica B, 2000
The low-temperature variations of the thermal expansion coefficient α(T) of a PrBa2Cu3O6+x cerami... more The low-temperature variations of the thermal expansion coefficient α(T) of a PrBa2Cu3O6+x ceramic are reported for two oxygenation states (x=0.4 and 0.9). They show a peak at the ordering temperature of Pr deduced from the susceptibility χ(T) and the specific heat Cp(T), i.e. at TN=9.5 and 14.5 K, for x=0.4 and 0.9, respectively. The deduced Grüneisen parameter Γeff is rather large, show almost no anomaly at TN, but a sharp increase below ≈5K. The origin of these variations is discussed in terms of magnetic behaviour of the Pr and Cu sublattices.
Physica C: Superconductivity, 1994
ABSTRACT Low temperature remanent (REM), Field-Cooled (FC) and Zero-Field-Cooled (ZFC) magnetizat... more ABSTRACT Low temperature remanent (REM), Field-Cooled (FC) and Zero-Field-Cooled (ZFC) magnetizations of YBa2Cu3O7−δ single crystal (Tc ≈ 91 K) have been studied in 10 to 100 Oe field range and for various orientations θ between the -axis and the applied magnetic field. Shape effects are minimized by using a cylindrical form crystal with the -axis lying in the circular section. The “well known” relation MREM = MFC − MZFC is observed. Our main results show anisotropy on REM and FC magnetizations which can be interpreted as resulting from intrinsic pinning of vortices between CuO2 layers. A quantitative interpretation is given.
Physica B: Condensed Matter, 2000
The magnetic anisotropy of the RE> ions in rare earth iron garnets (REIG) can be often described ... more The magnetic anisotropy of the RE> ions in rare earth iron garnets (REIG) can be often described by an e!ective spin Hamiltonian with an exchange tensor G representing the iron-RE anisotropic interactions. Some experimental results in DyIG and mixed Tb : YIG compounds, showing the so-called 1uuw2 angular phases, are tentatively compared to the predictions of this model, especially in terms of the anisotropic part of the G tensor related to the classical cubic anisotropy constants K , K and K .
Instrumentation Science & Technology, 2021
Abstract A polarization beam splitter (PBS) based on a magnetic fluid-filled dual-core photonic c... more Abstract A polarization beam splitter (PBS) based on a magnetic fluid-filled dual-core photonic crystal fiber is characterized. This is the first time that anisotropy of magnetic fluid is applied to the fiber polarization beam splitter. The designed device is able to separate x and y polarization modes completely by applying an external magnetic field. When the length of the device is 9.905 mm (or 16.795 mm), the maximum bandwidth of the effective working wavelength is 26 nm (or 70 nm) and the tunable magnetic field width is approximately 5 Oe (or 165 Oe) corresponding to magnetic field range from 24 to 29 Oe (or 135 to 300 Oe). By tuning the external magnetic field, the proposed beam splitter may be selected to operate in the S, C, and L bands, and the working wavelength bandwidth and center wavelength are tunable.
IOP Conference Series: Materials Science and Engineering, 2020
This work is aimed to study the influence of the replacement of the magnetic cations Tb3+ by diam... more This work is aimed to study the influence of the replacement of the magnetic cations Tb3+ by diamagnetic cations Y3+ on the low-temperature point’, TB predicted by Belov for ferrimagnets with and without magnetic compensation point, Tcomp. Isothermal magnetizations, MT(H) are carried out on single crystals of two mixed terbium-yttrium ferrite garnets TbxY3-xFe5O12 (x = 1.98 and 0.37). The measurements are performed using DC magnetic field, H up to 80 kOe applied along the <111> and <100> crystallographic directions in the 1.5-300 temperature range. From the approximation to the second order of H, the expansion of MT(H) is analyzed on the basis of the T-dependences of the spontaneous magnetization, MS, the paraprocess magnetic susceptibility, χp and the parameter, |b| of the bH2 term. The manifestation of ferromagnetic-and antiferromagnetic-type low-temperature paraprocess and other concomitant effects is observed in the temperature dependences of the derivative, dMS/dT w...
Nanophotonics
A novel fiber-optic vector magnetic field sensor and its sensing quality dependent of fabrication... more A novel fiber-optic vector magnetic field sensor and its sensing quality dependent of fabrication method has been proposed and investigated. The proposed sensor has two surfaces on the tip of a multimode fiber, which is used as the sensing probe. By plating different thickness of gold film on the surfaces, surface plasmon resonance (SPR) can be generated and the signal can be reflected by the surfaces as well. Meanwhile, magnetic fluid (MF) as the magnetic field sensitive material is packed around the sensing probe. The experimental results prove that the response of MF to external magnetic field can be used to sense magnetic field intensity and direction via monitoring the dip wavelength of SPR. The obtained refractive index (RI) sensitivities are 2105 nm/RIU (RI range: 1.332–1.365) and 6692 nm/RIU (RI range: 1.372–1.411), magnetic field intensity sensitivities are 11.67 nm/mT (0°), and −0.47 nm/mT (90°). Besides, the proposed sensing probe is ultracompact and the footprint is extr...
Optics Express
Fiber-optic magnetic field sensors based on magnetic fluid (MF) is encountering with thermal effe... more Fiber-optic magnetic field sensors based on magnetic fluid (MF) is encountering with thermal effects and demand for vectorization for several years. A common solution is to use axially processed fiber cascaded with fiber Bragg grating (FBG). However, the length of such sensors is usually in centimeter-level, which restricts the sensing applications in narrow space and gradient field cases. In this work, we present an ultracompact reflection-type dual-channel sensor for vector magnetic field (Channel 1, referred as CH1) and temperature (Channel 2, referred as CH2) monitoring, which is composed of a pair of gold-plated wedge-shaped multimode fiber (MMF) tip and gold-plated multimode-no-core fiber (MNF) tip. The surface plasmon resonance (SPR) effect was adopted. The two sensor probes are coated with magnetic-field-sensitive MF and temperature-sensitive polydimethylsiloxane (PDMS), respectively. The issue of vector magnetic field and temperature cross-sensitivity is tactfully resolved....
2019 18th International Conference on Optical Communications and Networks (ICOCN), 2019
In this paper, a kind of magnetic photonic crystal fiber of Yttrium iron garnet (YIG) is presente... more In this paper, a kind of magnetic photonic crystal fiber of Yttrium iron garnet (YIG) is presented. The influence of gyrotropy on TE-TM mode conversion is analysed, which depends on Faraday rotation. The structure parameters are simulated and optimized. The optimum efficiency of 93.57% is obtained. Faraday rotation and modal birefringence have been calculated by varying gyrotropy from 0.01 to 0.04. The numerical results reveal an increased Faraday rotation and a reduced modal birefringence of 10-5. The enhanced properties of the structure could improve photonic devices performance, which make it suitable for magneto-optical isolators.
Journal of Physics: Conference Series, 2019
In this work, a polarization-independent waveguide based on magnetic photonic crystal (MPC) with ... more In this work, a polarization-independent waveguide based on magnetic photonic crystal (MPC) with a triangular lattice of air holes in Yttrium Iron Garnet (YIG) slab grown on alumina (Al2O3) substrate is proposed, where both TE-like and TM-like periodic band gaps overlap. YIG is well known for its attracting magneto-optical (MO) properties and used to produce a coupling between the TE and TM modes. Thus, a nonreciprocal effect can be obtained by applying an external magnetic field parallel to the direction of propagation. At 1550 nm, the complete photonic band gap is simulated and optimized using the three dimensional plane-wave expansion method. The aim of this study is to enhance Faraday rotation (FR) while maintaining a low modal birefringence. A numerical analysis in function of magnetic gyration (g) has been reported, using the BeamProp software. The results reveal a proportional relation between FR, Δ n and g, such for g = 0.5, a large FR of 26.11×104 °/cm with Δ n = 7×10−6. Th...
IEEE Sensors Journal, 2017
Two kinds of magnetic field sensors based on Sagnac loop and knot resonator configurations with m... more Two kinds of magnetic field sensors based on Sagnac loop and knot resonator configurations with microfiber coupling structures are proposed and investigated experimentally. The designed sensors are made from the microfiber coupler, whose coupling region is coated with magnetic fluid. The as-fabricated sensors have the same sensing/coupling region, but the achieved sensitivities are greatly different, which are 19.4 pm/Oe and 171.8 pm/Oe for the microfiber Sagnac loop and microfiber knot resonator structures, respectively. Comparing with the microfiber Sagnac loop and other similar microfiber knot resonator (or silicon microring) sensing structures, the sensitivity of the as-designed microfiber knot resonator sensing structure is enhanced significantly. The underlying mechanisms are expounded physically in terms of the microscopic formation of the coupling region and the essence of interference for the microfiber knot resonator structure. The designed structures could potentially lead to highly sensitive magnetic field sensors and other new-fashioned magneto-optical photonic devices.
Optics express, Jan 13, 2015
A kind of reflective all-fiber magnetic field sensor based on a non-adiabatically tapered microfi... more A kind of reflective all-fiber magnetic field sensor based on a non-adiabatically tapered microfiber with magnetic fluid is proposed and experimentally demonstrated. The modal interference effect is caused by the abrupt tapers, which result in an approximately sinusoidal spectral response. The reflection spectra of the proposed sensor under different magnetic field strengths have been measured and theoretically analyzed. The maximum sensitivity of 174.4 pm/Oe is achieved at wavelength of around 1511 nm. Besides, an intensity tunability of -0.02 dB/Oe is also achieved. Comparing with the traditional sensors operating at transmission mode, the presented sensor in this work owns the advantages of smaller size and higher sensitivity and resolution due to the enhanced extinction ratio. The proposed structure is also promising for designing other tunable all-in-fiber photonic devices.
Optics Express, 2021
A novel, compact, and easy fabrication vector magnetic field sensor has been proposed and investi... more A novel, compact, and easy fabrication vector magnetic field sensor has been proposed and investigated. The proposed sensor consists of a U-bent single-mode fiber fixed in a magnetic-fluid-filled vessel. Neither mechanical modification nor additional fiber grating is needed during the sensor fabrication. The results show that the response of magnetic fluid to magnetic field can be used to measure the direction and intensity of magnetic field via whispering gallery modes supported by the U-bent fiber structure with suitable bending radius. The sensitivity of direction is 0.251 nm/°, and the maximum magnetic field intensity sensitivity is 0.517 nm/mT. Besides, the results of this work prove the feasibility for realizing vector magnetic sensors based on other bending structures (such as bending multimode interference, bending SPR structure) in the future.
Applied Surface Science, 2016
IEEE Transactions on Applied Superconductivity, 2016
IEEE Transactions on Magnetics, 2015
Journal of Magnetism and Magnetic Materials, 2015
Using single crystals of terbium iron garnet (TbIG), magnetic properties were studied in high dc ... more Using single crystals of terbium iron garnet (TbIG), magnetic properties were studied in high dc magnetic fields up to 200 kOe, within the 4. 2 to 300 K temperature range. Two kinds of magnetic behavior were found in the two regions separated by the compensation temperature, 244 ± 2 K. Above Tcomp, the ferrimagnetic model was verified. Below Tcomp, the exchange anisotropy associated with the "double umbrella" magnetic structure became important. In the case of H parallel to the [100] direction, two distinct transitions were observed below 20 K. The experimental results obtained in both dc and pulsed fields were compared, and the differences are discussed here.
Journal of Magnetism and Magnetic Materials, 2015
ABSTRACT This paper is devoted to the description of the magnetic phase diagrams (MPD) together w... more ABSTRACT This paper is devoted to the description of the magnetic phase diagrams (MPD) together with a special interest to the determination of more precise values of some reliable parameters at the compensation point, Tcomp=243.5 5±0.5 K of the terbium iron garnet, Tb3Fe5O12 or TbIG. Using isothermal magnetizations performed on single crystal in strong dc magnetic fields up to 200 kOe applied along the <111>, <110> and <100> directions within the temperature range 128-295 K, field-induced phase transitions between collinear and canted phases are observed in the vicinity of Tcomp at critical fields, Hc2. By comparison with the measurement at zero external magnetic field, the specific heat, Cp(T) at 80 kOe along <111> shows an excess around Tcomp characterized by an anomaly with a width in the boundaries of the canted phase and a maximum at 252 K, the more accurate value of the critical temperature, TC⁎ of the MPD in the (Hc2-T) plane. Better determinations of the molecular field coefficients which represent the magnetic interactions on the Tb sublattice are obtained by an improved molecular field model based on the saturation effects of the Tb sublattice and the differential susceptibility contribution due to the Fe sublattices to the total magnetic susceptibility of TbIG. The results are discussed in terms of the previous theoretical studies of the MPD predicted for weakly anisotropic ferrimagnets.
Physica B: Condensed Matter, 2015
Neutron Diffraction, 2012
Physica B, 2000
The low-temperature variations of the thermal expansion coefficient α(T) of a PrBa2Cu3O6+x cerami... more The low-temperature variations of the thermal expansion coefficient α(T) of a PrBa2Cu3O6+x ceramic are reported for two oxygenation states (x=0.4 and 0.9). They show a peak at the ordering temperature of Pr deduced from the susceptibility χ(T) and the specific heat Cp(T), i.e. at TN=9.5 and 14.5 K, for x=0.4 and 0.9, respectively. The deduced Grüneisen parameter Γeff is rather large, show almost no anomaly at TN, but a sharp increase below ≈5K. The origin of these variations is discussed in terms of magnetic behaviour of the Pr and Cu sublattices.
Physica C: Superconductivity, 1994
ABSTRACT Low temperature remanent (REM), Field-Cooled (FC) and Zero-Field-Cooled (ZFC) magnetizat... more ABSTRACT Low temperature remanent (REM), Field-Cooled (FC) and Zero-Field-Cooled (ZFC) magnetizations of YBa2Cu3O7−δ single crystal (Tc ≈ 91 K) have been studied in 10 to 100 Oe field range and for various orientations θ between the -axis and the applied magnetic field. Shape effects are minimized by using a cylindrical form crystal with the -axis lying in the circular section. The “well known” relation MREM = MFC − MZFC is observed. Our main results show anisotropy on REM and FC magnetizations which can be interpreted as resulting from intrinsic pinning of vortices between CuO2 layers. A quantitative interpretation is given.
Physica B: Condensed Matter, 2000
The magnetic anisotropy of the RE> ions in rare earth iron garnets (REIG) can be often described ... more The magnetic anisotropy of the RE> ions in rare earth iron garnets (REIG) can be often described by an e!ective spin Hamiltonian with an exchange tensor G representing the iron-RE anisotropic interactions. Some experimental results in DyIG and mixed Tb : YIG compounds, showing the so-called 1uuw2 angular phases, are tentatively compared to the predictions of this model, especially in terms of the anisotropic part of the G tensor related to the classical cubic anisotropy constants K , K and K .