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Updated: May 7, 2025

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Magnetic Tweezers for the Measurement of Twist and Torque
Published on: May 19, 2014
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在旋转轨道扭矩MRAM中利用轨道霍尔效应.
Rahul Gupta1, Chloé Bouard2, Fabian Kammerbauer3
1Institute of Physics, Johannes Gutenberg University Mainz, 55099, Mainz, Germany. rahul.gupta.phy@outlook.com.
Nature communications
|January 2, 2025
概括
可以将磁随机存储器 (MRAM) 中的旋转轨道扭矩 (SOT) 效率提高30%以上. 这导致切换电流和功率减少,为下一代内存技术铺平了道路.
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:
- 旋转轨道扭矩 (SOT) 磁性随机访问存储器 (MRAM) 为缓存存储器等应用提供了功率效率,非挥发性和性能方面的优势.
- 在SOT MRAM中实现高效的磁化切换,数据保留和高密度集成,需要具有垂直磁性异构 (PMA) 和通过轨道厅效应 (OHE) 增强扭矩的铁磁铁.
研究的目的:
- 在选定的OHE层 (Ru,Nb,Cr) 上设计PMA [Co/Ni]3铁磁体.
- 调查理论上预测的更高轨道霍尔导电率 (OHC) 的潜力,以量化OHE/[Co/Ni]3堆中的扭矩和切换电流.
- 为了验证 (Ru) 在工业环境中的设备中的应用.
主要方法:
- 在OHE层上制造PMA [Co/Ni]3薄膜,包括Ru,Nb和Cr.
- 磁性特性和SOT切换行为的表征.
- 缓冲式扭矩效率和切换电流的量化.
- 使用 Ru OHE 层与标准 Pt 层的设备性能比较.
主要成果:
- 与纯Pt.相比,Ru OHE层的阳性信号显示,缩式扭矩效率大约提高了30%,与纯Pt.相比.
- 在超过250个设备中,与Pt相比,Ru的开关电流减少了大约20%.
- 使用Ru OHE层实现了60%以上的切换功率降低.
结论:
- 鲁表现出优越的轨道大厅导电性 (OHC),验证了理论预测.
- 在OHE/[Co/Ni]3堆中使用Ru显著提高了SOT的效率,并减少了开关功率.
- 这些发现突显了增强轨道扭矩的潜力,以推动SOT-MRAM技术向下一代内存解决方案发展.
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