Tunneling giant magnetoresistance in heterogeneous Fe-SiO2 granular films

被引：127

作者：

Honda, S ^{[1
]}

Okada, T ^{[1
]}

Nawate, M ^{[1
]}

Tokumoto, M ^{[1
]}

机构：

[1] ELECTROTECH LAB,TSUKUBA,IBARAKI 305,JAPAN

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.56.14566

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic and transport properties are examined for heterogeneous Fe-SiO2 granular films prepared on glass substrates by rf sputteriug. The superparamagnetic nature and the tunneling giant magnetoresistance are observed in the films having Fe volume fractions smaller than 45%. The magnetization and magnetoresistance (MR) curves;Ire systematically anal?zed by the summation of two Langevin functions. The dependence of the MR ratio on the Fe volume fraction is explained phenomenologically by the distance between the nearest-neighbor grain surfaces. The temperature dependence uf the MR ratio is also discussed.

引用

页码：14566 / 14573

页数：8

共 16 条

[1]

ABELES B, 1975, ADV PHYS, V24, P407, DOI 10.1080/00018737500101431

[2] GIANT MAGNETORESISTANCE OF (001)FE/(001) CR MAGNETIC SUPERLATTICES [J].