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在大程度上调制的电压控制的参数振荡器中,对复杂的动态进行分支
1National Institute of Advanced Industrial Science and Technology (AIST), Research Center for Emerging Computing Technologies, Tsukuba, Ibaraki, 305-8568, Japan. tomohiro-taniguchi@aist.go.jp.
Scientific reports
|February 5, 2024
概括
研究人员利用微波电压探索铁磁体中的磁化动力学. 他们发现,一个更强的电压控制的磁性异性质效应可以导致复杂的,混乱的行为,为非易失性记忆切换提供了新的可能性.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 这就是Spintronics.
背景情况:
- 铁磁体中磁化的参数振荡可以通过微波电压实现,这表明对非挥发性内存切换有希望.
- 从历史上看,微波电压诱导的垂直磁性异构的调制不如平面内磁场那么重要.
- 材料科学近期的进步极大地提高了电压控制磁性异构 (VCMA) 效应的效率.
研究的目的:
- 在广泛的微波VCMA效应下对磁化动态进行数值研究.
- 分析增加VCMA效率对磁化行为的影响.
- 探索从周期性振荡到复杂动态的过渡.
主要方法:
- 兰道-利夫希茨-吉尔伯特方程的数值解.
- 对分叉图的分析用于绘制磁化动态图.
- 在不同调制幅度下的磁化动态中评估局部最大值.
主要成果:
- 对于低调制幅度,观察到周期性参数振荡.
- 随着微波磁性异质性场超过外部场,局部最大值的扩大分布出现了.
- 这种扩大意味着复杂的动态的出现,包括混乱和暂时混乱的行为.
结论:
- 这项研究证明了复杂的磁化动态,包括混乱,由强烈的微波VCMA效应驱动.
- 这一发现突显了在自旋电子设备中先进控制磁化的潜力.
- 结果表明设计高性能非易失性存储技术的新途径.
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