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The low damping Neel relaxation time for fine ferromagnetic particles from the energy diffusion method of Kramers

机译:克雷默斯能量扩散法对细铁磁颗粒的低阻尼尼尔弛豫时间

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摘要

The formula for the relaxation time of the magnetization of a single domain ferromagnetic particle in the low damping limit which has hitherto been derived by the method of first passage times [I. Klik, L. Gunther, J. Stat. Phys. 60 (1990) 473] is derived by extending the low damping escape rate theory (flux over barrier method) of Kramers [H.A. Kramers, Physica 7 (1940) 284], originally given for mechanical particles to spins, yielding a much simpler calculation. The analog with macroscopic mechanisms of polarization oscillation in H-bonded chains is emphasized.
机译:迄今为止,通过初次通过时间的方法推导了在低阻尼极限下的单畴铁磁粒子的磁化弛豫时间的公式。 Klik,L.Gunther,J.Stat。物理60(1990)473]是通过扩展Kramers的低阻尼逃逸率理论(通量越过屏障方法)得出的。 Kramers,Physica 7(1940)284],最初是为使机械粒子自旋而给出的,其计算要简单得多。强调了在H键链中极化振动的宏观机制的类似物。

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