Enhancement of magnetic coercivity and macroscopic quantum tunneling in monodispersed Co/CoO cluster assemblies

被引：20

作者：

Peng, DL

Sumiyama, K

Hihara, T

Yamamuro, S

机构：

[1] Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan

[2] Japan Sci & Technol Corp, CREST, Kawaguchi 3320012, Japan

来源：

APPLIED PHYSICS LETTERS | 1999年 / 75卷 / 24期

关键词：

D O I：

10.1063/1.125479

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Magnetic properties have been measured for monodisperse-sized Co/CoO cluster assemblies prepared by a plasma-gas-condensation-type cluster beam deposition technique. The clear correlation obtained between exchange bias field and coercivity suggests the enhancement of uniaxial anisotropy owing to the exchange coupling between the ferromagnetic Co core and antiferromagnetic CoO shell, and magnetic disorder at the core-shell interface. A nonthermal magnetic relaxation observed below 8 K, being referred to as macroscopic quantum tunneling of the magnetization, is ascribed to the enhanced uniaxial anisotropy. (C) 1999 American Institute of Physics. [S0003-6951(99)02150-6].

引用

页码：3856 / 3858

页数：3

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