Computer simulation of coercive force and thermal viscosity in perpendicular recording media
作者： M. Igarashi , M. Hara , Y. Suzuki , A. Nakamura , Y. Sugita
关键词: Condensed matter physics 、 Materials science 、 Rotation 、 Magnetization 、 Magnetic hysteresis 、 Perpendicular recording 、 Viscosity 、 Micromagnetics 、 Ferromagnetism 、 Coercivity
摘要: The micromagnetic simulations for perpendicular recording media with incoherent magnetization rotation was performed by dividing a grain into subgrains in the direction of film thickness. When intra-grain exchange coupling smaller, occurred, leading to stronger thermal fluctuation effect and lower coercive force H/sub c/. It found that critical thickness /spl delta//sub c/ exists, beyond which occurs. is approximately proportional 2.5/sup */(A/K/sub u/)/sup 1/2/, where A stiffness constant K/sub u/ uniaxial anisotropy energy. In rotation, decreasing rate logarithmic time (in viscosity slopes) larger than coherent rotation. calculations were good agreement experimental forces slopes.
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