A study of anisotropic magnetoresistance in a-FeNiMnBSi alloys

Longitudinal and transverse magnetoresistivity measurements have been performed on amorphous Fe sub 40--x Ni sub 40 Mn sub x B sub 12 Si sub 8 alloys (0 < = x < = 5.5) in fields < = 40 kG, at 4.2, 100, 200 and 300K. Above technical saturation, all the alloys exhibit a negative slope, i.e. t...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 1994-07, Vol.6 (28), p.5493-5506
Main Authors: Sharma, N, Prasad, S, Nigam, A K, Chandra, G, Shringi, S N, Krishnan, R
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic conduction in metals and alloys
Electronic transport in condensed matter
Exact sciences and technology
Galvanomagnetic and other magnetotransport effects
Metals. Metallurgy
Physics
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Summary:Longitudinal and transverse magnetoresistivity measurements have been performed on amorphous Fe sub 40--x Ni sub 40 Mn sub x B sub 12 Si sub 8 alloys (0 < = x < = 5.5) in fields < = 40 kG, at 4.2, 100, 200 and 300K. Above technical saturation, all the alloys exhibit a negative slope, i.e. the resistivity, decreases as a function of the magnetic field. The high-field magnetoresistivity slope becomes more and more negative with increasing manganese concentration. Assuming that the negative slope of magnetoresistance is caused by the suppression of spin waves, the temperature and composition dependence of magnetoresistivity of the present series could be qualitatively, understood. The spin-wave contribution to the zero-field resistivity has been estimated using a simplified approach. Furthermore, the ferromagnetic anisotropy of resistivity has been calculated and the results are analysed in the light of a two-current conduction model generalized to weak ferromagnets and amorphous alloys.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/6/28/022