Origin of ferromagnetism in Zn1-xCoxO from magnetization and spin-dependent magnetoresistance measurements

被引：121

作者：

Dietl, T. ^{[1
,2
,3
]}

Andrearczyk, T. ^{[1
]}

Lipinska, A. ^{[1
]}

Kiecana, M. ^{[1
]}

Tay, Maureen ^{[4
]}

Wu, Yihong ^{[4
]}

机构：

[1] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland

[2] Warsaw Univ, Inst Theoret Phys, PL-00681 Warsaw, Poland

[3] ERATO Semicond Spintron Project, Japan Sci & Technol Agcy, PL-02668 Warsaw, Poland

[4] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore

来源：

PHYSICAL REVIEW B | 2007年 / 76卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.76.155312

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to elucidate the nature of ferromagnetic signatures observed in (Zn,Co)O, we have examined experimentally and theoretically magnetic properties and spin-dependent quantum localization effects that control low-temperature magnetoresistance. Our findings, together with a through structural characterization, substantiate the model assigning spontaneous magnetization of (Zn,Co)O to uncompensated spins at the surface of antiferromagnetic nanocrystal of Co-rich wurtzite (Zn,Co)O. The model explains a large anisotropy observed in both magnetization and magnetoresistance in terms of spin Hamiltonian of Co ions in the crystal field of the wurtzite lattice.

引用

页数：5

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