Alignment of iron nanoparticles in a magnetic field due to shape anisotropy

被引：7

作者：

Radhakrishnan, B. ^{[1
]}

Nicholson, D. M. ^{[1
]}

Eisenbach, M. ^{[1
]}

Parish, C. ^{[1
]}

Ludtka, G. M. ^{[1
]}

Rios, O. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2015年 / 394卷

关键词：

Monte Carlo; Shape anisotropy; Magnetic field; Scaling; Alignment;

D O I：

10.1016/j.jmmm.2015.07.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

During high magnetic field solidification processing there is evidence for the alignment of nanoscale metallic particles with elongated morphologies that nucleate from a liquid metal. Such alignment occurs well above the Curie temperature of the particle where the magneto-crystalline anisotropy energy and exchange energy contributions are negligible. The main driving force for alignment is the magnetic shape anisotropy. Current understanding of the phenomenon is not adequate to quantify the effect of particle size, aspect ratio, temperature and the magnetic field on particle alignment. We demonstrate a Monte Carlo approach coupled with a scaling law for the dipole-dipole interaction energy as a function of the particle size to identify the conditions under which such alignment is possible. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：481 / 490

页数：10

共 15 条

[1]

Du, 2015, J MATER RES, V30, P1043

[2] Phase selection, growth, and interface kinetics in undercooled Fe-Ni melt droplets [J].