The author considers the combined influence of eddy currents plus spin dynamics on limiting the quasi-coherent rotational switching speed of thin-film heads. The results represent lower physical limits, and exclude potentially slower and more complex incoherent reversal mechanisms. A simplified head model employs the 1-D eddy current diffusion equation coupled to the planar form of Gilbert's equations for spin dynamics. Effects of head saturation and internal demagnetization fields are included. When Gamma not=t/sub e/ omega /sub r/=(eddy current diffusion time)*(spin resonance frequency) is of the order 100, numerically integrated results for the time-dependent, volume-averaged magnetization >M(t)< can be described by two simple analytical models applicable to cases where the applied reversing field H/sub a/>or=H/sub sat/, or H/sub a/H/sub sat/, where H/sub sat/ is that field required to saturate the yoke. For Gamma >or=10, the eddy current models progressively fail due to the influence of spin-inertia.
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机译：作者考虑了涡流加自旋动力学对限制薄膜头准相干旋转开关速度的综合影响。结果表示较低的物理极限，并且排除了可能更慢和更复杂的非相干反转机制。简化的磁头模型将一维涡流扩散方程式与吉尔伯特方程的平面形式耦合用于自旋动力学。包括磁头饱和度和内部退磁磁场的影响。当Gamma not = t / sub e /ω/ sub r / =（涡流扩散时间）*（自旋共振频率）的数量级为100时，随时间变化的体积平均磁化强度> M（t ）<可以通过两个简单的分析模型来描述，该模型适用于所应用的反向磁场H / sub a />或= H / sub sat /，或H / sub a / H / sub sat /，其中H / sub sat /是饱和磁轭所需的磁场。对于Gamma≥10的情况，由于自旋惯性的影响，涡流模型逐渐失效。
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