Particle size and temperature dependence of exchange bias in NiO nanoparticles

被引：92

作者：

Makhlouf, Salah A. ^{[1
]}

Al-Attar, H. ^{[1
]}

Kodama, R. H. ^{[2
]}

机构：

[1] Assiut Univ, Fac Sci, Dept Phys, Assiut 71516, Egypt

[2] Univ Illinois, Dept Phys, Chicago, IL 60607 USA

来源：

SOLID STATE COMMUNICATIONS | 2008年 / 145卷 / 1-2期

关键词：

A. nickel oxide; A; nanoparticle; A antiferromagnet; D. exchange and superexchange;

D O I：

10.1016/j.ssc.2007.10.019

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Zero-field cooled (ZFC) and field cooled (FC) magnetizations are measured for NiO nanoparticles of size 5-55 nm. Variations with particle size (d) and temperature of the coercivity (H-C), exchange bias field (HE), coercivity enhancement (Delta H-C) are discussed. The results are interpreted in terms of exchange bias (EB) models. H-E and the ferromagnetic magnetization (M-FM) arising from uncompensated surface spins of otherwise antiferromagnetic (AF) NiO show inverse trends when presented as functions of particle size. An interfacial exchange energy Delta sigma of similar to 0.03 erg/cm(2), comparable to those of NiO/Co and NiO/permalloy bilayers, is observed. Finally, it has been found that the coercivity enhancement Delta H-C = H-C (FC) - H-C (ZFC) scales with the interfacial exchange energy in the present system. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：1 / 4

页数：4

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