Uniform excitations in magnetic nanoparticles

被引：43
作者：
Morup, Steen [1 ]
Frandsen, Cathrine [1 ]
Hansen, Mikkel Fougt [2 ]
机构：
[1] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark
[2] Tech Univ Denmark, Dept Micro & Nanotechnol, DTU Nanotech, DK-2800 Lyngby, Denmark
来源：
BEILSTEIN JOURNAL OF NANOTECHNOLOGY | 2010年 / 1卷
关键词：
collective magnetic excitations; Mossbauer spectroscopy; neutron scattering; spin waves; superparamagnetic relaxation;
D O I：
10.3762/bjnano.1.6
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We present a short review of the magnetic excitations in nanoparticles below the superparamagnetic blocking temperature. In this temperature regime, the magnetic dynamics in nanoparticles is dominated by uniform excitations, and this leads to a linear temperature dependence of the magnetization and the magnetic hyperfine field, in contrast to the Bloch T-3/2 law in bulk materials. The temperature dependence of the average magnetization is conveniently studied by Mossbauer spectroscopy. The energy of the uniform excitations of magnetic nanoparticles can be studied by inelastic neutron scattering.
引用
收藏
页码：48 / 54
页数：7
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