CrO $_2$颗粒磁化动力学的微霍尔磁法研究
Magnetization dynamics of a CrO$_2$ grain studied by micro-Hall magnetometry
摘要：
采用微霍尔磁强计研究了单个微米级CrO $_2$颗粒的磁化动力学。通过这种技术，我们跟踪一个单一的畴壁的运动，这使我们能够探测整个材料的缺陷分布。沿晶粒易磁化方向的外部磁场引起磁化反转，从而引起磁化的一系列急剧跳跃。微磁学模拟的支持下，我们确定了过渡到一个国家与一个单一的交叉结畴壁，钉扎/脱钉的壁随机巴克豪森跳跃的结果。
英文摘要：
Micro-Hall magnetometry is employed to study the magnetization dynamics of a single, micron-size CrO$_2$ grain. With this technique we track the motion of a single domain wall, which allows us to probe the distribution of imperfections throughout the material. An external magnetic field along the grain's easy magnetization direction induces magnetization reversal, giving rise to a series of sharp jumps in magnetization. Supported by micromagnetic simulations, we identify the transition to a state with a single cross-tie domain wall, where pinning/depinning of the wall results in stochastic Barkhausen jumps.
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