Magnetization study of nanograined pure and Mn-doped ZnO films: Formation of a ferromagnetic grain-boundary foam

被引：340

作者：

Straumal, Boris B. ^{[1
,2
,3
]}

Mazilkin, Andrei A. ^{[1
,2
]}

Protasova, Svetlana G. ^{[1
,2
]}

Myatiev, Ata A. ^{[3
]}

Straumal, Petr B. ^{[3
,4
]}

Schuetz, Gisela ^{[1
]}

van Aken, Peter A. ^{[1
]}

Goering, Eberhard ^{[1
]}

Baretzky, Brigitte ^{[1
]}

机构：

[1] Max Planck Inst Met Res, D-70569 Stuttgart, Germany

[2] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Moscow District, Russia

[3] Technol Univ, Moscow Steel & Alloys Inst, Moscow 119991, Russia

[4] Univ Munster, Inst Mat Phys, D-48149 Munster, Germany

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 20期

基金：

俄罗斯基础研究基金会;

关键词：

ferromagnetic materials; grain boundaries; magnetisation; manganese; nanostructured materials; vacancies (crystal); zinc compounds; ROOM-TEMPERATURE FERROMAGNETISM; THIN-FILMS; OPTICAL-PROPERTIES; SEMICONDUCTORS; CO; NANOWIRES; MAGNETISM; NANORODS; SYSTEM; ZNMNO;

D O I：

10.1103/PhysRevB.79.205206

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to elucidate room-temperature (RT) ferromagnetism (FM) in ZnO, we have analyzed a multitude of experimental publications with respect to the ratio of grain-boundary (GB) area to grain volume. FM only appears if this ratio exceeds a certain threshold value s(th). Based on these important results nanograined pure and Mn-doped ZnO films have been prepared, which reveal reproducible RT FM and magnetization proportional to the film thickness, even for pure ZnO films. Our findings strongly suggest that grain boundaries and related vacancies are the intrinsic origin for RT ferromagnetism.

引用

页数：6

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