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)
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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)