Origin of Surface Canting within Fe3O4 Nanoparticles

被引：62

作者：

Krycka, K. L. ^{[1
]}

Borchers, J. A. ^{[1
]}

Booth, R. A. ^{[2
]}

Ijiri, Y. ^{[3
]}

Hasz, K. ^{[3
]}

Rhyne, J. J. ^{[4
]}

Majetich, S. A. ^{[2
]}

机构：

[1] NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

[2] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[3] Oberlin Coll, Oberlin, OH 44074 USA

[4] US DOE, Washington, DC 20585 USA

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 14期

基金：

美国国家科学基金会;

关键词：

ANGLE NEUTRON-SCATTERING; POLARIZED NEUTRONS; SEPARATION; MAGNETISM;

D O I：

10.1103/PhysRevLett.113.147203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The nature of near-surface spin canting within Fe3O4 nanoparticles is highly debated. Here we develop a neutron scattering asymmetry analysis which quantifies the canting angle to between 23 degrees and 42 degrees at 1.2 T. Simultaneously, an energy-balance model is presented which reproduces the experimentally observed evolution of shell thickness and canting angle between 10 and 300 K. The model is based on the concept of T-d site reorientation and indicates that surface canting involves competition between magnetocrystalline, dipolar, exchange, and Zeeman energies.

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页数：5

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