Temperature dependence of tunnel-type GMR in insulating granular systems

被引：26
作者：
Mitani, S
Fujimori, H
Ohnuma, S
机构：
[1] Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 98077, Japan
[2] Res Inst Elect & Magnet Mat, Sendai, Miyagi 982, Japan
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1998年 / 177卷
关键词：
magnetoresistance-giant; granular systems; tunneling; thin films sputtered;
D O I：
10.1016/S0304-8853(97)00498-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have investigated temperature dependence of tunnel-type giant magnetoresistance (GMR) in insulating granular systems of Co-Al-O and Fe-Al-O. Below 50 K the magnetoresistance Delta/rho(max) remarkably increases with decreasing temperature, resulting in Delta rho/rho(max) = 16% and 25% at 4.2 K for Co52Al20O28 and Fe44Al17O39, respectively. This increase cannot be interpreted well by means of extending the theory for tunnel-type GMR in ferromagnetic tunnel junctions, but it suggests that the magnitude of GMR is influenced by Coulomb blockade in insulating granular systems. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：919 / 920
页数：2
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