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
相关论文
共 32 条
  • [1] [Anonymous], 1997, International Series of Monographs on Physics
  • [2] [Anonymous], 1996, SPRINGER SERIES SOLI
  • [3] Uniform spin wave modes in antiferromagnetic nanoparticles with uncompensated moments
    Bahl, C. R. H.
    Garde, J.
    Lefmann, K.
    Jensen, T. B. S.
    Lindgard, P. -A.
    Madsen, D. E.
    Morup, S.
    [J]. EUROPEAN PHYSICAL JOURNAL B, 2008, 62 (01) : 53 - 57
  • [4] Size dependence of the properties of hematite nanoparticles
    Bodker, F
    Morup, S
    [J]. EUROPHYSICS LETTERS, 2000, 52 (02): : 217 - 223
  • [5] SURFACE EFFECTS IN METALLIC IRON NANOPARTICLES
    BODKER, F
    MORUP, S
    LINDEROTH, S
    [J]. PHYSICAL REVIEW LETTERS, 1994, 72 (02) : 282 - 285
  • [6] THERMAL FLUCTUATIONS OF A SINGLE-DOMAIN PARTICLE
    BROWN, WF
    [J]. PHYSICAL REVIEW, 1963, 130 (05): : 1677 - +
  • [7] Coey J M. D., 2010, Magnetism and Magnetic Materials, P464, DOI DOI 10.1017/CBO9780511845000
  • [8] Magnetic dynamics of weakly and strongly interacting hematite nanoparticles
    Hansen, MF
    Koch, CB
    Morup, S
    [J]. PHYSICAL REVIEW B, 2000, 62 (02): : 1124 - 1135
  • [9] Dynamics of magnetic nanoparticles studied by neutron scattering
    Hansen, MF
    Bodker, F
    Morup, S
    Lefmann, K
    Clausen, KN
    Lindgard, PA
    [J]. PHYSICAL REVIEW LETTERS, 1997, 79 (24) : 4910 - 4913
  • [10] Magnetic dynamics of fine particles studied by inelastic neutron scattering
    Hansen, MF
    Bodker, F
    Morup, S
    Lefmann, K
    Clausen, KN
    Lindgård, PA
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2000, 221 (1-2) : 10 - 25
1234