Giant magnetoresistance and microstructure in Cr-Fe and Cu-Co heterogeneous alloys

K. Takanashi; J. Park; T. Sugawara; K. Hono; A. Goto; H. Yasuoka; H. Fujimori

doi:10.1016/0040-6090(95)07064-8

Giant magnetoresistance and microstructure in Cr-Fe and Cu-Co heterogeneous alloys

K. Takanashi, J. Park, T. Sugawara, K. Hono, A. Goto, H. Yasuoka, H. Fujimori

Collaborative Research Center on Energy Materials

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

We have investigated the relationship between the giant magnetoresistance (GMR) and the microstructure in sputter-deposited Cu-Co heterogeneous alloy films. MR varies depending on Co concentration, x, and it shows a maximum around x=20 at.%Co. The transmission electron microscopy and nuclear magnetic resonance measurements reveal that the size of Co particles and the compositional profile near the interfaces of Co particles do not depend on x. The magnetization measurements suggest that the particle density increases with increasing x. When the particle density is too high, the ferromagnetic coupling between Co particles is dominant, resulting in a reduction in MR. The particle density for x ∼ 20 at.%Co is considered to be optimum for GMR.

Original language	English
Pages (from-to)	106-110
Number of pages	5
Journal	Thin Solid Films
Volume	275
Issue number	1-2
DOIs	https://doi.org/10.1016/0040-6090(95)07064-8
Publication status	Published - 1996 Apr 1

Keywords

Alloys
Magnetic properties and measurements
Nuclear magnetic resonance
Transmission electron microscopy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Surfaces and Interfaces
Surfaces, Coatings and Films
Metals and Alloys
Materials Chemistry

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abstract = "We have investigated the relationship between the giant magnetoresistance (GMR) and the microstructure in sputter-deposited Cu-Co heterogeneous alloy films. MR varies depending on Co concentration, x, and it shows a maximum around x=20 at.%Co. The transmission electron microscopy and nuclear magnetic resonance measurements reveal that the size of Co particles and the compositional profile near the interfaces of Co particles do not depend on x. The magnetization measurements suggest that the particle density increases with increasing x. When the particle density is too high, the ferromagnetic coupling between Co particles is dominant, resulting in a reduction in MR. The particle density for x ∼ 20 at.%Co is considered to be optimum for GMR.",

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