Thermal Activation in Permanent Magnets

被引：28
作者：
Bance, S. [1 ]
Fischbacher, J. [1 ]
Kovacs, A. [1 ]
Oezelt, H. [1 ]
Reichel, F. [1 ]
Schrefl, T. [1 ,2 ]
机构：
[1] St Polten Univ Appl Sci, Dept Technol, A-3100 St Polten, Austria
[2] Danube Univ Krems, Ctr Integrated Sensor Syst, A-2700 Wiener Neustadt, Austria
来源：
JOM | 2015年 / 67卷 / 06期
关键词：
MAGNETIZATION PROCESSES; COERCIVITY; DEPENDENCE; NUCLEATION; ANISOTROPY; MECHANISM; FIELD;
D O I：
10.1007/s11837-015-1415-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The coercive field of permanent magnets decays with temperature. At non-zero temperatures, the system can overcome a finite energy barrier through thermal fluctuations. Using finite element micromagnetic simulations, we quantify this effect, which reduces coercivity in addition to the decrease of the coercive field associated with the temperature dependence of the anisotropy field, and validate the method through comparison with existing experimental data.
引用
收藏
页码：1350 / 1356
页数：7
相关论文
共 36 条
  • [1] Grain-size dependent demagnetizing factors in permanent magnets
    Bance, S.
    Seebacher, B.
    Schrefl, T.
    Exl, L.
    Winklhofer, M.
    Hrkac, G.
    Zimanyi, G.
    Shoji, T.
    Yano, M.
    Sakuma, N.
    Ito, M.
    Kato, A.
    Manabe, A.
    [J]. JOURNAL OF APPLIED PHYSICS, 2014, 116 (23)
  • [2] Influence of defect thickness on the angular dependence of coercivity in rare-earth permanent magnets
    Bance, S.
    Oezelt, H.
    Schrefl, T.
    Ciuta, G.
    Dempsey, N. M.
    Givord, D.
    Winklhofer, M.
    Hrkac, G.
    Zimanyi, G.
    Gutfleisch, O.
    Woodcock, T. G.
    Shoji, T.
    Yano, M.
    Kato, A.
    Manabe, A.
    [J]. APPLIED PHYSICS LETTERS, 2014, 104 (18)
  • [3] An analysis of coercivity in various hard magnetic materials relating coercive field and activation volume
    Barthem, VMTS
    Givord, D
    Rossignol, MF
    Tenaud, P
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2002, 242 : 1395 - 1398
  • [4] Brown W., 1959, J APPL PHYS, V30, pS62, DOI [10.1063/1.2185970, DOI 10.1063/1.2185970]
  • [5] Thermally induced vortex nucleation in permalloy elements
    Dittrich, R
    Schrefl, T
    Kirschner, M
    Suess, D
    Hrkac, G
    Dorfbauer, F
    Ertl, O
    Fidler, J
    [J]. IEEE TRANSACTIONS ON MAGNETICS, 2005, 41 (10) : 3592 - 3594
  • [6] Dittrich R, 2002, J MAGN MAGN MATER, V250, pL12, DOI 10.1016/S0304-8853(02)00388-8
  • [7] DETERMINATION OF INTRINSIC MAGNETIC MATERIAL PARAMETERS OF ND2FE14B FROM MAGNETIC MEASUREMENTS OF SINTERED ND15FE77B8 MAGNETS
    DURST, KD
    KRONMULLER, H
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1986, 59 (1-2) : 86 - 94
  • [8] LaBonte's method revisited: An effective steepest descent method for micromagnetic energy minimization
    Exl, Lukas
    Bance, Simon
    Reichel, Franz
    Schrefl, Thomas
    Stimming, Hans Peter
    Mauser, Norbert J.
    [J]. JOURNAL OF APPLIED PHYSICS, 2014, 115 (17)
  • [9] MICROSTRUCTURAL EVIDENCE FOR THE MAGNETIC SURFACE HARDENING OF DY2O3-DOPED ND15FE77B8 MAGNETS
    GHANDEHARI, MH
    FIDLER, J
    [J]. MATERIALS LETTERS, 1987, 5 (7-8) : 285 - 288
  • [10] COERCIVITY MECHANISMS IN FERRITE AND RARE-EARTH TRANSITION-METAL SINTERED MAGNETS (SMCO5, ND-FE-B)
    GIVORD, D
    TENAUD, P
    VIADIEU, T
    [J]. IEEE TRANSACTIONS ON MAGNETICS, 1988, 24 (02) : 1921 - 1923
1234