Magnetocrystalline anisotropy of a novel Y (Fe, V)< sub> 9.66 intermetallic compound and its nitride with a disordered CaCu< sub> 5-type structure (original) (raw)
Effects of Ga substitution in Y2Fe17 compounds on the magnetocrystalline anisotropy
Journal of Alloys and Compounds, 1995
X-ray diffraction patterns of Y2Fel7_xGax show that the samples prepared with 0 < x < 7.5 are single phase having the hexagonal Th2Ni17type structure and/or the rhombohedral Th2Zn~7-type structure. The substitution of Ga for Fe in Y2Fe17 leads to a linear increase of the unit cell volume and a linear decrease of the saturation magnetization. The Curie temperature Tc is found first to increase with increasing gallium content x, attains a maximum value of about 540 K between x = 3 and 4, and then decreases monotonically. X-ray diffraction measurements on magnetically aligned powder samples of Y2Fe17_xGa x reveal a change in the easy magnetization direction from easy plane to easy c axis with increasing Ga concentration. The samples with x > 7.0 have a uniaxial magnetocrystalline anisotropy at room temperature.
Modern Physics Letters B, 2011
The structural and magnetoelastic properties of polycrystalline samples of Y 3 Fe 27.2 Cr 1.8 and Ce 3 Fe 25 Cr 4 intermetallic compounds are investigated by means of X-ray diffraction, thermomagnetic, thermal expansion and magnetostriction measurements in the temperature range of 77–500 K under applied magnetic fields up to 1.5 T. The well defined anomalies observed in the linear thermal expansion coefficient curves are associated with the magnetic phase transitions and presence of small amounts of 1:12 phase in the Ce 3 Fe 25 Cr 4 sample; the latter is also confirmed by AC susceptibility measurements. For Y 3 Fe 27.2 Cr 1.8, saturation behavior is observed in the anisotropic magnetostriction isotherms near the magnetic ordering temperature (TC), whereas for Ce 3 Fe 25 Cr 4 compound, saturation starts well below TC. The additional anomalies observed in the volume magnetostriction isotherms of both compounds are explained based on the anisotropy field in the a–b plane and along the ...
Journal of Alloys and Compounds, 2007
The structural and magnetic properties of compounds with nominal composition Y 3 (Fe 1−x Co x) 29−y Cr y (x = 0.6-1.0 and y = 5-7) have been investigated. The main phase formed was that of Nd 3 (Fe,Ti) 29-type structure (3:29) with a significant amount of a disordered variant of the hexagonal Th 2 Ni 17-type structure (2:17H) as a secondary phase (25-50 wt.%), especially for higher Co (80% and above) content. The unit cell volume is decreasing with the increase of the Co and Cr content, as well as all the cell parameters. The Curie temperature of both phases decreases monotonically with x and y. The x = 1.0 compound is paramagnetic at room temperature. The x = 0.6, 0.8 compounds present uniaxial anisotropy along the [2 0 4] direction of the monoclinic Nd 3 (Fe,Ti) 29-type structure, which should be attributed to the transition metal sublattice. The saturation magnetization and the anisotropy field are lower in the sample with x = 0.8 compared to the one with x = 0.6. This reduction is also observed in the Mössbauer spectra of the materials at room temperature which are also presented.
Structural and magnetic properties of the rare-earth iron nitride solution series Y2(Fe1−xCox)17N3−δ
Journal of Magnetism and Magnetic Materials, 1991
The powders in the micrometer scale of Sm(Co 0.86 Fe 0.1 B 0.04 ) 7.5 , Sm(Co 0.82 Fe 0.1 Zr 0.04 B 0.04 ) 7.5 , Sm(Co 0.715 Fe 0.1 Cu 0.12 Zr 0.04 B 0.025 ) 7.5 , Sm(Co 0.69 Fe 0.1 Cu 0.12 Zr 0.04 B 0.05 ) 7.5 compounds have been prepared by using a high-energy planetary ball miller. The X-ray diffraction patterns have an amorphous state after 42 hours milling while the average grain size is in the range of 0.5-10 µm, as measured by using a scanning electron microscope. Amorphization has been achieved at shorter milling times for samples with higher boron content. Depending on the annealing temperature, the major phases are 1:7, 2:17 hexagonal or fcc-Co as revealed from the Xray patterns. The annealing at temperature over 900 o C for 1h helps the formation of the fcc-Co which becomes the dominant phase, mostly on the higher boron doped samples. From the hysteresis curve of Sm(Co 0.715 Fe 0.1 Cu 0.12 Zr 0.04 B 0.025 ) 7.5 , a coercive field of ~9 kOe has been determined. For this sample there is difference between the two coercive fields, Η c(χirr=max) and Η c(M=0) . The zirconium doped sample has higher coercive field than the Sm(Co 0.86 Fe 0.1 B 0.04 ) 7.5 one. The coercive field is significant increases to the copper doped samples. In the thermomagnetic curves of the asmilled powders, it has been evidenced that there is crystallization, connected to the increase of the magnetization under the constant applied field. The initial and demagnetization curves exhibit slope variations that are connected to the soft fcc-Co phase. Almost zero hydrogen absorption was found for the Cu-doped samples at room temperature.
Structural and magnetic properties of Y 6 (Fe 1-x Mn x ) 23
Le Journal de Physique Colloques, 1979
The ternary system Y 6 (Fe 1 _ x Mn ;e) 2 3 exhibits unusual magnetic behavior. Although both Y 6 Mn 23 and Y g Fe 23 are magnetically ordered, these ternaries show a striking reduction in both Curie temperature and magnetization. In the compositional range of JC = 0.5 to 0.75, there exists no magnetic ordering at liquid helium temperatures. The Mn and Fe atoms are found to exhibit strong site preference in the Y 6 (Fe 0 25 Mn 075) 2 3 unannealed, Y 6 (Fe 0 25 Mn 0 75) 23 annealed and Y 6 (Fe 0 5 Mn 0 5) 23 unannealed samples. The magnetization of these compounds is field-dependent and suggests possible spin glass behavior.
A comparative study of the magnetoelastic properties of the YFe 10V 2 and NdFe 10V 2 compounds
Journal of Magnetism and Magnetic Materials, 2007
The magnetoelastic properties of iron-rich REFe 10 V 2 (RE ¼ Nd, Y) compounds were studied via magnetostriction and thermal expansion measurements in the 5-300 K range of temperature in up to 6 T external fields. Results of thermal expansion analysis show that the spontaneous magnetostriction of the compounds mostly originates from itinerant magnetization. Besides, the small volume striction appearing in the thermal expansion of the Nd compound close to 50 K suggests the existence of a basal to conical spin reorientation transition. The volume magnetostriction isotherms of both compounds take minimum values for external field corresponding to the anisotropy field. In addition, the anisotropic and the volume magnetostriction traces of the NdFe 10 V 2 take marked maxima under low field, with a relatively large initial magnetostrictivity, again more pronounced at the conical-axial spin re-orientation transition (T SR ¼ 130 K). Analysis of the anisotropic magnetostriction of the Nd compound leads to the conclusion that the contribution of Nd-Fe interactions is negligible. The temperature dependence of volume magnetostriction is in good agreement with prediction of a phenomenological model based upon a fluctuating local band theory. This analysis shows that the difference between the forced volume strictions of Y and Nd compounds below and above T SR originates from the Nd sublattice magnetization. r
Magnetic properties of Y/sub 2/Fe/sub 17-x/M/sub x/N/sub y/ compounds, with M=Mo, V or Ti
IEEE Transactions on Magnetics, 1994
Results of X-ray diffraction studies and magnetic measurements performed on Y2Fe17-& compounds (M=Mo,V or Ti) and their nitrides are reported. By nitrogenation of the parent alloys, the lattice parameters increase significantly, this fact determining a substantial increase of the Curie temperature. The volume effects on the variation of Curie temperatures in YZFe17-xlMxNy decrease when increasing M content The dlnTJdlnV values show a h e a r dependence on the Curie temperatures. The experimental data are analysed in a model which supposes that the greatest fraction of iron 3d electrons are localized.
Magnetocrystalline anisotropy of Nd3(Fe1-xCox)27.7Ti1.3Ny compounds
J. Alloys Compd. 458 pp. 37-40 (2008)
The effect of Co substitution for Fe in Nd3(Fe1-xCox)27.7Ti1.3Ny (0≤x≤0.4) compounds on the magnetocrystalline anisotropy has been investigated. The anisotropy constants K's and the anisotropy field HA have been deduced from the magnetization curves measured on magnetically aligned powder (4-7 m) samples. The obtained results show that at RT the anisotropy is uniaxial and HA (about 10 T) and does not change substantially upon the substitution. At 5 K the results for K's give evidence for the presence of easy-cone-type anisotropy. The cone angle as well as the anisotropy field decrease upon the substitution from 21.6 to 11.8 degrees and from 22.8 to 18.6 T respectively.
Magnetoelastic effects in the YFe10V2 ferromagnetic alloy
Physica Status Solidi (c), 2006
Magnetoelastic effects in the YFe10V2 alloy between 5 and 300 K, and under magnetic fields up to 6 T are studied. Results show that spontaneous magnetostriction of the sample is positive in agreement with what is observed in similar iron based compounds and with the well known increase of the exchange interactions with interatomic distances. Two mechanisms of the forced magnetostriction, in polycrystalline samples, were clearly identified. The mechanism associated with the rotation of magnetization is of single ion origin and leads to a negative contribution to the volume magnetostriction. The other mechanism, mainly of two ions origin, is the same as the one responsible for the spontaneous magnetostriction. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Journal of Physics: Condensed Matter, 2009
The magnetic properties of the YFe 12-x M x compounds (M=Ti, Mo or V; x=1 to 3.5) have been determined in the ordered ferromagnetic state as well as in the paramagnetic state. The iron magnetic moment has been determined from 4K up to the Curie temperature whereas the analysis of the paramagnetic region has led to the determination of the effective iron magnetic moment. The number of spins has been calculated below and above the Curie temperature in order to discuss the degree of itinerancy of the Fe magnetic behavior in the YFe 12-x M x compounds. All the YFe 12-x M x compounds (M=Ti, Mo or V; x=1 to 3.5) have very similar crystalline properties: they crystallize in the same crystal structure and all the M elements used here are known to substitute for iron on the same crystal site. On the contrary, they exhibit a wide range of magnetic behavior: the Curie temperature varies from 63 to 539K and the mean magnetic moment per iron atom is also very dependent upon the M element used and its concentration. Furthermore the degree of itinerancy of the iron is not preserved along YFe 12-
Magnetic properties of Y(Fe 0.95 Mn 0.05 ) 2 compound
Hyperfine Interactions, 1999
Mssbauer spectroscopy, magnetization and X-ray diffrraction measurements of the ternary compound Y(Fe0.95Mn0.05)2 prepared by melting were performed in order to investigate the effect of the substitution of Mn on the magnetic properties of YFe2. The experimental results show change of the lattice parameter. The magnetization and the Curie temperature decrease with substitution of Fe by Mn.
Journal of Alloys and Compounds, 2000
A far-from-equilibrium preparation route and using a particular combination of starting materials led us to obtain nonstoichiometric Y(Fe, V) and its interstitial carbide. Structural analysis and EDAX results reveal the formation of the main 1:12 phase with the 12 ThMn-type structure, with 13-15% vacancies at the 3d metal sites. Insertion of interstitial carbon increases the T and magnetization of 12 Cẗ he 1:12 phase, whereas the unit cell volume remains unchanged. The effects of vacancies and interstitial carbon on the Mossbauer hyperfine fields and isomer shifts are discussed with reference to the calculated quantities.
Compositional Dependence of Magnetocrystalline Anisotropy in Fe-, Co-, and Cu-Alloyed Ni-Mn-Ga
Metals, 2022
The key for the existence of magnetic induced reorientation is strong magnetocrystalline anisotropy, i.e., the coupling between ferroelastic and ferromagnetic ordering. To increase the transformation temperatures and thus functionality, various elemental alloying in Ni-Mn-Ga is tried. We analyzed more than twenty polycrystalline alloys alloyed by small amount (up to 5atom%) of transitional metals Co, Fe, Ni, and Cu for the value of magnetic anisotropy in search of general trends with alloying. In agreement with previous reports, we found that maximum anisotropy occurs at stoichiometric Ni2MnGa and any alloying decreases its value. The strongest decrease of the anisotropy is observed in the case where the alloyed elements substitute Ga.
Effect of nitrogenation on the magnetic properties of Y2Fe17-xMx compounds, with M = Al, Ga or Si
Solid State Communications, 1994
Results of X-ray diffraction studies and magnetic measurements performed on Y2Fel7_xM x compounds with M = AI, Ga or Si as well as on their nitrides are reported. The lattice constants of Y2Fel7_xMx compounds increase when Fe is substituted by AI or Ga and decrease when Fe is replaced by Si. By nitrogenation of the samples, the lattice parameters increase significantly. The volume effect on the variation of Curie temperatures in Y2Fe17_xMxNy compounds decreases when Fe is substituted by A1, Ga or Si. Magnetization data evidence a linear dependence of the mean iron moment on the Curie temperatures in the nitrides.
Structural and Magnetic Properties of Ni0.45-xCu(x+y)Zn0.55-yFe2O4
2011
CITATIONS 0 READS 41 4 authors, including: Some of the authors of this publication are also working on these related projects: Multiferroic composites View project Structural, Optical and Electromagnetic Properties of calcium and strontium substituted soft ferrite by solid state reaction method View project
Structural and magnetic properties of chemically synthesized yttrium-substituted nickel nanoferrite
Journal of Particle Science and Technology, 2022
In this paper, yttrium-substituted nickel ferrite (NiY2xFe2-2xO4) nanostructures were synthesized via the co-precipitation method with different concentrations of yttrium (x = 0.00, 0.02, 0.06, and 0.12 %, where x is the dopant concentration in molar percent) after calcination at 500 ºC. Structural studies of the samples were analyzed using X-ray diffractometry (XRD) technique. XRD results showed that the addition of Y led to an increase in synthesized nanoparticles. Molecular studies have been done using Fourier transform infrared (FT-IR) spectroscopy. FT-IR results showed that the bands at about 550-560 and 433 cm-1 are associated with tetrahedral and octahedral Metal-O bonds, respectively. Field emission scanning electron microscopy (FE-SEM) exhibit that adding Y3+ ions dopant up to x = 0.06 led to a considerable decrease in the powders’ particle size. Adding more dopant up to x = 0.12 led to an amorphous and crystalline phase formation. The size of nanoparticles before substitution estimated from FE-SEM images were 39.49, 36.49, and 50.78 nm, which increased to 63.07, 64.02, and 73.56 nm after the substitution, respectively. The magnetic behavior of the samples was investigated using vibrating sample magnetometry (VSM) at room temperature (RT). VSM results showed that the saturation magnetization and coercivity (Hc) values decreased with the increase of yttrium contents up to x = 0.12. This was referred to as the redistribution of cations on the octahedral bonds.
A survey on the effect of vanadium content on the magnetoelastic properties of YFe 12− x V x alloys
Journal of Magnetism and Magnetic Materials, 2011
Experimental results on the thermal expansion and magnetostriction of YFe 12 À x V x (1.5 r x r 3.5) alloys are reported. The results show that the anisotropic magnetostriction (Dl) at a finite field (1.5 T) increases with increasing vanadium content in the range of x o 2. But for x 42, a decrease in the magnetic anisotropy with increasing vanadium content causes a decrease in the saturation values of Dl. In addition, the thermal expansion coefficient becomes a minimum for x E 2. Experimental curves exhibit that the forced volume magnetostriction (DV/V) is positive and increases linearly with the applied field at high fields. But in the low field region (r0.5 T), a minimum appears in the isothermal curves of DV/V around the saturation field. The results are explained by considering the influence of vanadium content on the magnetization anisotropy of YFe 12 À x V x compounds.
Journal of Magnetism and Magnetic Materials, 2008
Experimental results on the thermal expansion and magnetostriction of YFe 10 V 2 composites are reported and the influence of H and N interstitial atoms is studied. The anisotropic magnetostriction is about 30% larger in the composite than in the starting alloy. Also, the anisotropic magnetostriction remains positive after insertion of H (N) ion while the sign of volume magnetostriction changes by hydrogenation. The anisotropic magnetoelastic interactions are enhanced by insertion of H and especially N interstitial atoms. The results are discussed considering the effect of H and N, and of temperature on magnetic anisotropy and microstructure. r