Finite-size scaling is utilized to study the erasure mechanism in heat-assisted magnetic recording (HAMR). Predicted scaling equations are evaluated both numerically and experimentally by using the write current-assist percentage (WCAP) method. The method estimates the erasing temperature of an external magnetic field by writing and erasing magnetization patterns at different frequencies. In particular, WCAP modeling shows that the Curie temperature scales according to the time scale that the recording grain is exposed to the elevated temperature. The deviation of the erase temperature from $T_{c}$ for different values of the applied field is also used to estimate the scaling behavior of the anisotropy field $H_{k}$ and the critical exponent $\beta $ . In addition, the Stoner–Wohlfarth model is shown to be an accurate approximation for field angle dependence of the erasing process for the FePt media. Faster roll-off in the effective field is observed at small angles for the thermal ECC media.

中文翻译：

---

热辅助磁记录中的热擦除

利用有限尺寸缩放来研究热辅助磁记录（HAMR）中的擦除机制。通过使用写电流辅助百分比（WCAP）方法，可以在数值上和实验上评估预测的比例方程式。该方法通过以不同频率写入和擦除磁化图案来估计外部磁场的擦除温度。尤其是，WCAP建模显示，居里温度根据记录颗粒暴露于高温下的时间尺度而变化。擦除温度与 $ T_ {c} $ 对于不同的应用场值，还用于估计各向异性场的缩放行为 $ H_ {k} $ 和关键指数 $ \ beta $ 。此外，Stoner–Wohlfarth模型显示出是FePt介质擦除过程的场角依赖性的精确近似值。对于热ECC介质，可以在小角度观察到有效场中更快的滚降。