On the shape of the gamma resonance spectra of slowly relaxing nanoparticles in a magnetic field

被引：38

作者：

Chuev, M. A. ^{[1
]}

Cherepanov, V. M. ^{[2
]}

Polikarpov, M. A. ^{[2
]}

机构：

[1] Russian Acad Sci, Inst Phys & Technol, Moscow 117218, Russia

[2] Russian Res Ctr, Kurchatov Inst, Moscow 123182, Russia

来源：

JETP LETTERS | 2010年 / 92卷 / 01期

基金：

俄罗斯基础研究基金会;

关键词：

FERROMAGNETIC FECUNBB ALLOYS; COMPLEX MOSSBAUER-SPECTRA; GAMMA-FE2O3; NANOPARTICLES; HYPERFINE-STRUCTURE; RELAXATION MODEL; PARTICLE; SUPERPARAMAGNETS; SPECTROSCOPY; DYNAMICS; SYSTEMS;

D O I：

10.1134/S0021364010130047

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A nonstandard shape of the gamma resonance spectra of nanoparticles in the form of inverted five-step pedestal has been predicted, observed, and analytically described. This shape corresponds to the limit of high temperatures and slow relaxation of the homogeneous magnetization of single-domain particles with axial magnetic anisotropy. To describe the Mossbauer spectra of the ensemble of chaotically oriented nanoparticles in a magnetic field, a continual magnetic-dynamics model has been developed in the limit of slow relaxation. This model adequately describes the polarization effects observed in the experimental absorption spectra. The revealed features significantly expand the methodical capabilities of Mossbauer spectroscopy for the diagnostics of magnetic nanomaterials.

引用

页码：21 / 27

页数：7

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