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Structures and magnetic properties in nano-crystalline Fe-rich Fe-Ni and Fe-Co alloys

Published online by Cambridge University Press:  24 January 2007

Yongsheng Liu ,
Jincang Zhang ,
Shixun Cao ,
Liming Yu  and
Chuanbing Cai
Yongsheng Liu*
Affiliation:
Department of Mathematics and Physics, Shanghai University of Electric Power, Shanghai 200090, P.R. China
Jincang Zhang
Affiliation:
Department of Physics, Shanghai University, Shanghai 200444, P.R. China
Shixun Cao
Affiliation:
Department of Physics, Shanghai University, Shanghai 200444, P.R. China
Liming Yu
Affiliation:
Department of Physics, Shanghai University, Shanghai 200444, P.R. China
Chuanbing Cai
Affiliation:
Department of Physics, Shanghai University, Shanghai 200444, P.R. China
*
lysly99313@sohu.com
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Abstract

Nano-crystalline magnetic alloys of Fe-Ni and Fe-Co are fabricated by high-energy milling. The coexistence of bcc and fcc lattice structures is observed in some of Fe-Ni alloys, as opposed to Fe-Co ones which exhibit the bcc phase only. The grain sizes increase linearly with the lattice strains for Fe-Co, and exponentially so for Fe-Ni. The cut-off frequency decreases with increasing nickel content in Fe-Ni alloys, but increases with increasing cobalt content in Fe-Co alloys. The larger the cut-off frequency is, the smaller the initial permeability. Resonant behaviour is observed in the pure Fe and Fe-Ni samples, which is replaced by relaxant behaviour in Fe-Co, implying that the Co plays an important role in hindering the resonance. The initial permeability at 10 kHz varies inverse proportionally with the coercivity Hc. It reaches a maximum while Hc goes to a minimum at 7.69 at.% Ni or Co. It is interesting that average atomic moments of nanocrystalline alloys are inconsistent with the Slater-Pauling relation.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 37 , Issue 2 , February 2007 , pp. 197 - 201
Copyright
© EDP Sciences, 2007

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