Transition from granular to dilute magnetic semiconducting multilayers in ion-beam-deposited ZnO/Co

被引：44

作者：

Pakhomov, AB ^{[1
]}

Roberts, BK ^{[1
]}

Krishnan, KM ^{[1
]}

机构：

[1] Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA

来源：

APPLIED PHYSICS LETTERS | 2003年 / 83卷 / 21期

关键词：

D O I：

10.1063/1.1629369

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Multilayers of Co/ZnO, with varying nominal thickness of metal (2-10 A) and semiconductor (2-20 A), were prepared by ion-beam sputtering. Magnetic, transport, and magnetotransport measurements were carried out over a temperature range of 2.5 to 300 K. Upon decreasing Co thickness and increasing ZnO thickness in the multilayer stack, the properties of the samples undergo a crossover from those of granular metallic Co/semiconductor multilayers to a dilute magnetic semiconductor superlattice. We interpret ferromagnetism in the latter case as due to ordering in the Co-rich layers, mediated by carriers from lightly doped, high carrier concentration layers. (C) 2003 American Institute of Physics.

引用

页码：4357 / 4359

页数：3

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