Low-field colossal magnetoresistance in manganite tunnel spin valves

被引：269

作者：

Viret, M ^{[1
]}

Drouet, M ^{[1
]}

Nassar, J ^{[1
]}

Contour, JP ^{[1
]}

Fermon, C ^{[1
]}

Fert, A ^{[1
]}

机构：

[1] THOMSON CSF,LCR,CNRS,F-91404 ORSAY,FRANCE

来源：

EUROPHYSICS LETTERS | 1997年 / 39卷 / 05期

关键词：

D O I：

10.1209/epl/i1997-00391-2

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the magnetoresistive properties of all-oxide tunnel spin valves in which electrodes of mixed valence manganites (La0.7Sr0.3MnO3) are separated by a thin insulating layer. The structures were prepared by Pulsed Laser Deposition and several tunnel barriers were used including PrBa2(CuGa)(3)O-7, CeO2 and SrTiO3. The latter gives the largest magnetoresistive effect where the trilayer's resistance is increased by a factor of 5.5 at 50 Gauss and 4.2 K. Analysis of the temperature variation of the barrier resistivity shows that the dramatic loss of the magnetoresistive effect above 150 K is due to a reduced oxygen content of the interface between La0.7Sr0.3MnO3 and SrTiO3. Solving this problem should lead to similar results at room temperature.

引用

页码：545 / 549

页数：5

共 10 条

[1] TUNNELING CONDUCTANCE OF ASYMMETRICAL BARRIERS [J].