Structural, Magnetic and Transport Properties of Ni-Fe-Al Alloys

Abstract:

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Melt spun ribbons (MSR) of the Ni55Fe20Al25 alloy exhibit a first-order martensitic transition (MT) in the vicinity of a second-order ferromagnetic-to-paramagnetic phase transition. Contrasted with a sharp, complete and thermoelastic MT in MSR, a partial, sluggish and non-thermoelastic MT occurs in annealed Ni55Fe20Al25 alloy that possesses a much higher degree of atomic order. However, the annealed samples have stronger local magnetocrystalline anisotropy and higher Curie temperature (TC) than MSR. Negative magnetoresistance, || / , is two times larger in MSR than in the annealed case. || /  vs. H isotherms in MSR change curvature from concave-upwards to concave-downwards as the temperature is raised through TC whereas concave-downward curvature persists over the entire temperature range in the annealed counterpart.

Info:

Periodical:

Edited by:

V. A. Chernenko and J. M. Barandiaran

Pages:

111-116

DOI:

10.4028/www.scientific.net/MSF.635.111

Citation:

S.N. Kaul et al., "Structural, Magnetic and Transport Properties of Ni-Fe-Al Alloys", Materials Science Forum, Vol. 635, pp. 111-116, 2010

Online since:

December 2009

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