Magnetization-reversal processes in an ultrathin Co/Au film

被引:87
作者
Ferre, J
Grolier, V
Meyer, P
Lemerle, S
Maziewski, A
Stefanowicz, E
Tarasenko, SV
Tarasenko, VV
Kisielewski, M
Renard, D
机构
[1] UNIV PARIS 11, IOTA, CNRS, F-91405 ORSAY, FRANCE
[2] WARSAW UNIV BRANCH, INST PHYS, PL-15424 BIALYSTOK, POLAND
来源
PHYSICAL REVIEW B | 1997年 / 55卷 / 22期
关键词
D O I
10.1103/PhysRevB.55.15092
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Magnetization-reversal processes in a ferromagnetic cobalt film structure (Au/Co/Au), with perpendicular anisotropy, were investigated by magneto-optical magnetometry and microscopy. In the considered ultrathin Co film, the magnetization reversal between the two Ising-spin equilibrium states is dominated by the domain-wall;all motion mechanism. We focused our studies on processes initiated from a given demagnetized state. Starting from a magnetically saturated state generated under a large field H-S, applied perpendicular to the film. this demagnetized state is created through magnetic aftereffects in a field H-d antiparallel but smaller than H-S and applied during a selected time. Direct (R-D) and indirect (R-l) magnetization processes are then studied from this state for application of the field parallel and antiparallel to H-d, respectively. The dynamics of the magnetization reversal is much faster for the R-l process since it is initiated from a quasihomogeneous ''Swiss cheese'' domain state with small nonreversed regions. The magnetic accommodation phenomenon is studied, and a domain-shape memory effect evidenced. A theoretical analysis of the dynamics of magnetization processes is proposed. starting from the model of a patchy inhomogeneous media with a realistic distribution of local coercivities. The pertinent parameters for calculations are deduced from our experimental data using appropriate analytical expressions of the magnetic relaxation time and domain-wall velocity under a field. Computer simulations using these parameters reproduce well the time evolution of the magnetic domain pattern and different magnetization curves both for R-D and R-l magnetization processes.
引用
收藏
页码:15092 / 15102
页数:11
相关论文
共 20 条
  • [1] MAGNETIC DOMAINS IN THIN EPITAXIAL CO/AU(111) FILMS
    ALLENSPACH, R
    STAMPANONI, M
    BISCHOF, A
    [J]. PHYSICAL REVIEW LETTERS, 1990, 65 (26) : 3344 - 3347
  • [2] ASSESSMENT OF LOCAL VARIATIONS IN THE COERCIVITY OF MAGNETOOPTICAL MEDIA
    BERNACKI, BE
    WU, TH
    MANSURIPUR, M
    [J]. JOURNAL OF APPLIED PHYSICS, 1993, 73 (10) : 6838 - 6840
  • [3] CHARACTERIZATION OF MAGNETOOPTICAL RECORDING MEDIA IN TERMS OF DOMAIN BOUNDARY JAGGEDNESS
    BERNACKI, BE
    MANSURIPUR, M
    [J]. JOURNAL OF APPLIED PHYSICS, 1991, 69 (08) : 4960 - 4962
  • [4] HYSTERESIS PROPERTIES OF ULTRATHIN FERROMAGNETIC-FILMS
    BRUNO, P
    BAYREUTHER, G
    BEAUVILLAIN, P
    CHAPPERT, C
    LUGERT, G
    RENARD, D
    RENARD, JP
    SEIDEN, J
    [J]. JOURNAL OF APPLIED PHYSICS, 1990, 68 (11) : 5759 - 5766
  • [5] MAGNETIC-PROPERTIES OF FERROMAGNETIC THIN SANDWICHES CORRELATED TO THEIR CRYSTALLOGRAPHIC STRUCTURE AND INTERFACE MORPHOLOGY - HREM AND NMR-STUDY
    CESARI, C
    FAURE, JP
    NIHOUL, G
    LEDANG, K
    VEILLET, P
    RENARD, D
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1989, 78 (02) : 296 - 304
  • [6] FERRE J, 1995, J MAGN SOC JPN, V19, P79
  • [7] Investigation of the effects of nanostructure on the observable behavior of magnetic thin film using large-scale computer simulation
    Fu, Hong
    Giles, R.
    Mansuripur, M.
    Patterson, G.
    [J]. Computers in physics, 1992, 6 (06): : 610 - 629
  • [8] DOMAIN-WALL DYNAMICS IN TBFECO THIN-FILMS
    GADETSKY, SN
    STUPNOV, AV
    ZUMKIN, MV
    NIKOLAEV, EN
    [J]. IEEE TRANSACTIONS ON MAGNETICS, 1992, 28 (05) : 2928 - 2930
  • [9] GRADMANN U, 1993, HDB MAGNETIC MAT, V7
  • [10] MAGNETOOPTICAL ANISOMETRY OF ULTRATHIN COBALT FILMS
    GROLIER, V
    FERRE, J
    MAZIEWSKI, A
    STEFANOWICZ, E
    RENARD, D
    [J]. JOURNAL OF APPLIED PHYSICS, 1993, 73 (10) : 5939 - 5941