Magnetoresistance of mechanically induced grain boundaries in La0.7Ca0.3MnO3 films

被引：49

作者：

Srinitiwarawong, C ^{[1
]}

Ziese, M ^{[1
]}

机构：

[1] Univ Sheffield, Dept Phys, Sheffield S3 7RH, S Yorkshire, England

来源：

APPLIED PHYSICS LETTERS | 1998年 / 73卷 / 08期

关键词：

D O I：

10.1063/1.122109

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The magnetoresistance of mechanically induced grain boundaries in La0.7Ca0.3MnO3 thin films is investigated. The grain boundaries are fabricated by a mechanical deformation of the LaAIO(3) substrate prior to film deposition. During film deposition, the deformed substrate region induces some growth disorder in the film leading to a wide grain boundary. The resulting structures show a reproducible, substantial magnetoresistance in magnetic fields below 2 kG. We discuss the temperature and direction dependence of the magnetoresistance and argue that two contributions due to spin-polarized electron tunneling and the suppression of magnetic frustration by a magnetic field can be identified. (C) 1998 American Institute of Physics. [S0003-6951(98)02634-5]

引用

页码：1140 / 1142

页数：3

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