Giant magnetoresistance of melt-spun Cu-Ni-Fe alloys with spinodally-decomposed structure

Author

Chen, L.H. ; Yang, Y.K. ; Chang, Y.H.

Author_Institution

Dept of Mater. Eng., Kaohsiung Polytech. Inst., Taiwan

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

4012

Lastpage

4014

Abstract

We report the observation of giant magnetoresistance effect in as-spun and annealed spinodally decomposed Cu-Ni-Fe alloy ribbons. The magnetoresistance ratio of 9.5% was observed at 4.2 K for as-spun Cu₇₀Ni₁₅Fe₁₅ ribbon, which could be increased to 12.0% by annealing at 400 C for 15 min. In contrast to the temperature dependence of the magnetoresistance ratio of sputtered Cu-Ni-Fe films, melt-spun Cu-Ni-Fe ribbons show an increase in the magnetoresistance ratio upon cooling from room temperature to 4.2 K. The observed giant magnetoresistance behavior in Cu-Ni-Fe ribbons is mostly caused by the spin-dependent scattering at the two-phase interface and in the ferromagnetic phase, as well as scattering due to magnetic fluctuations such as very fine ferromagnetic particles

Keywords

annealing; copper alloys; ferromagnetic materials; giant magnetoresistance; iron alloys; magnetic particles; magnetic thin films; magnetoresistance; nickel alloys; spinodal decomposition; sputtered coatings; 15 min; 4.2 K; 400 C; Cu₇₀Ni₁₅Fe₁₅; as-spun Cu₇₀Ni₁₅Fe₁₅ ribbon; ferromagnetic phase; giant magnetoresistance effect; magnetic fluctuations; magnetoresistance ratio; melt-spun Cu-Ni-Fe alloys; spin-dependent scattering; spinodally-decomposed structure; two-phase interface; very fine ferromagnetic particles; Annealing; Copper alloys; Fluctuations; Giant magnetoresistance; Magnetic field measurement; Magnetic superlattices; Magnetization; Metallic superlattices; Particle scattering; Temperature dependence;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.489846

Filename

489846