Role of dipole-dipole interactions in half-field quantum transitions in magnetic nanoparticles

被引:7
|
作者
Noginova, N. [1 ]
Barnakov, Yu. [1 ]
Radocea, A. [2 ]
Atsarkin, V. A. [3 ]
机构
[1] Norfolk State Univ, Ctr Mat Res, Norfolk, VA USA
[2] Cornell Univ, Ithaca, NY USA
[3] Kotelnikov Inst Radio Engn & Elect RAS, Moscow, Russia
基金
美国国家科学基金会; 俄罗斯基础研究基金会;
关键词
Superparamagnetic nanoparticles; Electron magnetic resonance; RESONANCE; NI; NANOWIRES;
D O I
10.1016/j.jmmm.2011.03.042
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In order to better understand the origin of "forbidden" quantum transitions observed in superparamagnetic nanoparticles at low magnetic fields, electron magnetic resonance (EMR) studies have been performed at room temperature on iron oxide nanoparticles assembled inside parallel nanosized channels penetrating the anodic alumina membrane. The positions of both the main resonance and "forbidden" (2Q) transitions observed at the half-field demonstrate the characteristic angular dependence with the line shifts proportional to 3cos(2)theta-1, where theta is the angle between the channel axis and external magnetic field B. This result can be attributed to the inter-particle dipole-dipole interactions within elongated aggregates inside the channels. The angular dependence of the 2Q intensity is found to be proportional to sin(2)theta cos(2)theta, that is consistent with the predictions of quantum-mechanical calculations with the account for the mixing of states by non-secular inter-particle dipole-dipole interactions. Good agreement is obtained between different kinds of measurements (magnetization curves, line shifts and 2Q intensity), pointing to possibility of the quantum approach to the magnetization dynamics of superparamagnetic objects. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:2264 / 2270
页数:7
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