Finite temperature magnetization reversal in ultrathin magnetic films

被引:13
作者
Chui, ST
机构
[1] Bartol Research Institute, University of Delaware, Newark
关键词
D O I
10.1063/1.361600
中图分类号
O59 [应用物理学];
学科分类号
摘要
We study the magnetization reversal of Heisenberg spins in a two-dimensional plane under an external reversing field at finite temperatures. In the Ising limit dominated by uniaxial anisotropy and exchange, we observe nucleation of domains in Monte Carlo simulations. Analysis of the probability distribution in the energy provides for an estimate of the free energy for domain nucleation that is much smaller than that obtained from the wall energy at zero field because the energy of the nucleus approaches zero at the threshold of coherent rotation. The coercive field depends linearly on the temperature. When the dipolar interaction becomes important, reversed spins domains form quickly but do not grow. There is an intermediate regime when most spins are aligned parallel to the plane. (C) 1996 American Institute of Physics.
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页码:4951 / 4953
页数:3
相关论文
共 11 条
  • [1] REDUCTION IN COERCIVE FORCE CAUSED BY A CERTAIN TYPE OF IMPERFECTION
    AHARONI, A
    [J]. PHYSICAL REVIEW, 1960, 119 (01): : 127 - 131
  • [2] SYMMETRY-INDUCED UNIAXIAL ANISOTROPY IN ULTRATHIN EPITAXIAL COBALT FILMS GROWN ON CU(1113)
    BERGER, A
    LINKE, U
    OEPEN, HP
    [J]. PHYSICAL REVIEW LETTERS, 1992, 68 (06) : 839 - 842
  • [3] FUNDAMENTAL MAGNETIZATION PROCESSES IN THIN-FILM RECORDING MEDIA
    BERTRAM, HN
    ZHU, JG
    [J]. SOLID STATE PHYSICS: ADVANCES IN RESEARCH AND APPLICATIONS, VOL 46, 1992, 46 : 271 - 371
  • [4] NUCLEATION OF MAGNETIZATION REVERSAL VIA CREATION OF PAIRS OF BLOCH WALLS
    BROZ, JS
    BRAUN, HB
    BRODBECK, O
    BALTENSPERGER, W
    HELMAN, JS
    [J]. PHYSICAL REVIEW LETTERS, 1990, 65 (06) : 787 - 789
  • [5] PHASE BOUNDARIES IN ULTRATHIN MAGNETIC-FILMS
    CHUI, ST
    [J]. PHYSICAL REVIEW B, 1994, 50 (17): : 12559 - 12567
  • [6] FLUCTUATION AND ELASTIC PROPERTIES OF DOMAIN-WALLS IN 2-DIMENSIONAL DIPOLAR SYSTEMS
    CHUI, ST
    [J]. PHYSICAL REVIEW B, 1995, 51 (01): : 250 - 257
  • [7] FINITE-TEMPERATURE TRANSITIONS IN 2D DIPOLAR SYSTEMS WITH UNIAXIAL ANISOTROPY
    CHUI, ST
    [J]. PHYSICAL REVIEW LETTERS, 1995, 74 (19) : 3896 - 3899
  • [8] CHUI ST, IN PRESS J APPL PHYS
  • [9] HEINRICH B, 1993, ADV PHYS, V42, P524
  • [10] MAGNETIZATION REVERSAL IN ULTRATHIN FERROMAGNETIC-FILMS WITH PERPENDICULAR ANISOTROPY - DOMAIN OBSERVATIONS
    POMMIER, J
    MEYER, P
    PENISSARD, G
    FERRE, J
    BRUNO, P
    RENARD, D
    [J]. PHYSICAL REVIEW LETTERS, 1990, 65 (16) : 2054 - 2057