Tunneling magnetoresistance of Co clusters in MgF2

被引：19

作者：

Hackenbroich, B ^{[1
]}

Zare-Kolsaraki, H ^{[1
]}

Micklitz, H ^{[1
]}

机构：

[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

来源：

APPLIED PHYSICS LETTERS | 2002年 / 81卷 / 03期

关键词：

D O I：

10.1063/1.1494467

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Samples of Co clusters embedded in a MgF2 matrix have been prepared by the codeposition of well-defined Co clusters (mean diameter Lsimilar or equal to4.5 nm) and MgF2 molecules onto a cold substrate. This system shows a temperature-dependent tunneling magnetoresistance (TMR) which has a value of 34.7(2)% at 2.5 K, the largest TMR value reported for a granular Co system. This large TMR value either is due to an antiferromagnetic coupling of those Co clusters between which the tunneling occurs or is caused by an enhanced spin-polarization of the tunneling electrons. The latter may be caused by a cluster-surface/matrix interaction leading to dominated d-electron tunneling due to Co(3d)-F(2p) hybridization. (C) 2002 American Institute of Physics.

引用

页码：514 / 516

页数：3

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