High field surface magnetic study of Fe3O4 nanoparticles

被引：10

作者：

Kihal, A. ^{[1
]}

Fillion, G. ^{[1
]}

Bouzabata, B.

Barbara, B. ^{[2
]}

机构：

[1] CNRS UJF, LNCMI G, F-38042 Grenoble 9, France

[2] CNRS UJF, Inst Neel, F-38042 Grenoble 9, France

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2012年 / 249卷 / 03期

关键词：

ball-milling; magnetic saturation laws; magnetite nanoparticles; random anisotropy; surface spin canting; STRUCTURAL DISORDER; TRANSITION POINT; ANISOTROPY; SATURATION; DEPENDENCE; MOSSBAUER; LAW; NANOCRYSTALLINE; CONDUCTIVITY; BEHAVIOR;

D O I：

10.1002/pssb.201147412

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Magnetic properties of magnetite (Fe3O4) powders, milled for various times up to 15?h, are studied by magnetization measurements. For the starting powder, like in the bulk single crystal, the approach to magnetic saturation is mainly ruled by the usual 1/H and 1/H2 terms. But for the milled samples, as the grain size decreases, a 1/H1/2 term rises as the leading term and is interpreted in the framework of the theory of Chudnovsky et al. accounting for the effect of a random anisotropy generated near the surface, aside from a large constant high field susceptibility related to the canted spins at the surface.

引用

页码：604 / 614

页数：11

共 51 条

[1] MAGNETOCRYSTALLINE ANISOTROPY OF LOW-TEMPERATURE PHASE OF MAGNETITE [J].