Microwave-assisted magnetization reversal and multilevel recording in composite media

Microwave-assisted magnetization reversal and multilevel recording in composite media
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复合介质中的微波辅助磁化反转和多级记录

DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
V. Lomakin
V. Lomakin
中科院分区：
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文献类型：
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作者：
S. Li;B. Livshitz;H. Bertram;E. Fullerton;V. Lomakin

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研究了含软硬层交换耦合复合元件介质的微波辅助磁反转。与均匀元件相比，此类元件中的反转发生在大大减小的反转场、微波场和微波谐振频率下。根据软层厚度的不同，可以在均匀模式和非均匀畴壁辅助模式下发生反转。此外，还提出了一种多电平MAMR方案，其中记录介质包含多个电平元件，每个电平具有不同的谐振频率。这些水平是通过调整微波场的频率单独处理的。
Microwave-assisted magnetic reversal (MAMR) is studied for media comprising exchange-coupled composite elements comprising soft and hard layers. Reversal in such elements occurs under substantially reduced reversal fields, microwave fields, and microwave resonant frequencies as compared to those for homogeneous elements. Reversal can occur in uniform modes as well as nonuniform domain wall assisted modes depending on the soft layer thickness. In addition, a multilevel MAMR scheme is suggested where the recording media comprise multiple levels of elements, with each level having a distinct resonant frequency. These levels are addressed individually by tuning the frequency of the microwave field.