Observation of spin-dependent transport and large magnetoresistance in La0.7SrO3MnO3/SrTiO3/La0.7Sr0.3MnO3 ramp-edge junctions

被引：20

作者：

Kwon, C ^{[1
]}

Jia, QX ^{[1
]}

Fan, Y ^{[1
]}

Hundley, MF ^{[1
]}

Reagor, DW ^{[1
]}

机构：

[1] Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA

来源：

JOURNAL OF APPLIED PHYSICS | 1998年 / 83卷 / 11期

关键词：

D O I：

10.1063/1.367569

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have fabricated ferromagnet-insulator-ferromagnet junctions using a ramp-edge geometry based on (La0.7Sr0.3)MnO3 ferromagnetic electrodes and a SrTiO3 insulator. Pulsed laser deposition was used to deposit the multilayer thin films and the devices were patterned using photolithography and ion milling. As expected from the spin-dependent tunneling, the junction magnetoresistance is dependent on the relative orientation of the magnetization in the electrodes. A junction magnetoresistance (JMR) as large as 30% is observed at low temperatures and low fields. In addition, we have found that JMR is reduced at high temperatures (T > 100 K) and decreases monotonically with increasing field at high fields (0.5 T < H < 1T). Possible causes for these are also discussed. (C) 1998 American Institute of Physics.[S0021-8979(98)20411-7].

引用

页码：7052 / 7054

页数：3

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