在CoFeB/MgO系统中通过工作功能工程PtW1-底层进行大规模和可调节的基于电子耗尽的电压控制的磁性异构
Yu-Chia Chen1, Thomas Peterson2, Qi Jia1
1Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States.
ACS nano
|April 14, 2025
概括
研究人员使用W-Pt合金底层在磁随机存储器 (MRAM) 中增强了电压控制的磁性异构 (VCMA) 效应. 这种方法显著提高了VCMA效率,这对于低功耗嵌入式应用程序至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 电气工程 电气工程
背景情况:
- 电压控制的磁性异构 (VCMA) 是节能磁性随机访问存储器 (MRAM) 的关键.
- 在CoFeB/MgO接口中的VCMA低效率限制了MRAM性能.
- 需要对预测的电子枯竭 (ED) 对VCMA的影响进行实验验证.
研究的目的:
- 为了提高基于CoFeB/MgO的MRAM中的VCMA效率.
- 调查基于W的合金底层与不同度的Pt对VCMA的影响.
- 为了实验证实在Cofeb/MgO界面的电子耗尽.
主要方法:
- 合成基于W的金属合金底层,可控制Pt度.
- 使用这些底层制造MRAM设备.
- 使用高分辨率X射线光电子谱学 (HR-XPS) 分析界面电子状态的表征.
主要成果:
- 通过最佳的W-Pt合金底层,VCMA系数大约增加了八倍.
- 已经证明了电场可调整的垂直磁性异构 (PMA) 接口.
- HR-XPS证实了在CoFeB/MgO界面的Fe轨道中显著的电子耗尽,由结合能量转移证明.
结论:
- W-Pt合金底层提供了一种有效的,与行业兼容的方法来增强MRAM中的VCMA.
- 在热平衡下控制CoFeB/MgO界面上的费米表面特征对于提高VCMA效率至关重要.
- 这项工作为下一代低功耗MRAM设备提供了一条道路.
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