![]() ![]() In higher fields a DW velocity breakdown is observed. Above the propagationįield value the dynamics is due to viscous DW motion. Structural inhomogeneities controls the thermally activated magnetization reversal dynamics. Upon the applied magnetic field value three different regimes are evidenced and studied. Measurements asĪ function of the applied magnetic field and temperature enable us to estimate the magnetic parameters, such asĪctivation volumes, coercive fields, Gilbert damping parameters, etc., controlling the magnetization reversal. (DW) velocity and nucleation rate are determined from direct time-resolved domain structure imaging. Sandwiched by gold (1 1 1) layers, their magnetic anisotropy being perpendicular to the film surface. This paper presents a detailed study of the magnetization reversal dynamics in ultrathin cobalt films (tco = 6-12 A) ![]() Received 6 September 1996 received in revised form 26 November 1996 503, G)Tiversitb Paris-Sud, 91405 Orsay C~dex, France 510, Universit~ Paris-Sud, 91405 Orsav C~dex, Franceī Institut d'Optique Thborique et Appliqube, Brit. +~Laboratoire de Physique des Solides, associ~ au CNRS, Bdt. Magnetization reversal in ultrathin ferromagnetic filmsĪ. Journal of Magnetism and Magnetic Materials 171 (1997) 45 63 ![]()
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