Metamagnetic transition in Nd{sub 6}Fe{sub 14{minus}x}Al{sub x} compounds
- Instituto de Fisica, Universidade de Sao Paulo, Caixa Postal 66318, 05315-970 Sao Paulo (Brazil)
Ferrimagnetic Nd{sub 6}Fe{sub 14{minus}x}Al{sub x} compounds with x=3, 3.5, and 4 have been studied by magnetization measurements in fields up to 9 T. N{acute e}el temperatures were determined from M{umlt o}ssbauer spectra to be 308, 286, and 239 K, respectively. The net magnetization at T=4.2 K is 3.6 {mu}{sub B}/f.u.(x=3), 2.2 {mu}{sub B}/f.u.(x=3.5), and zero for x=4. Metamagnetic transitions were observed for all samples, at decreasing critical fields with increasing x. Both the metamagnetic transition hysteresis and the net magnetization decrease with increasing temperature and become negligible near 40 K. The initial susceptibility of Nd{sub 6}Fe{sub 10}Al{sub 4} shows an anomalous temperature dependence near T=25 K, which might be associated with a spin reorientation. The electrical resistance of the latter compound, measured as a function of applied field, exhibits an abrupt 3{percent} increase at the metamagnetic transition. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 496426
- Report Number(s):
- CONF-961141-; ISSN 0021-8979; TRN: 97:016129
- Journal Information:
- Journal of Applied Physics, Vol. 81, Issue 8; Conference: 41. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 12-15 Nov 1996; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
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