Fieldlike torque driven switching in rare-earth transition-metal alloys,Physical Review B

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Fieldlike torque driven switching in rare-earth transition-metal alloys
Physical Review B ( IF 3.2 ) Pub Date : 2024-09-09 , DOI: 10.1103/physrevb.110.094413
Huiwen Wang _{1,

1} , Pierre Vallobra _{1,

1} , Yong Xu _{1,

1} , Zhizhong Zhang ₁ , Shouzhong Peng _{1,

1,

1} , Weisheng Zhao _{1,

1,

1}

Affiliation

Spin-orbit torque (SOT) has been widely recognized and applied as the most promising approach for magnetic memory, primarily due to its lower energy consumption and longer device lifetime. However, the mechanism of SOT remains controversial in ferrimagnets, particularly regarding the role of fieldlike torque (FLT). This uncertainty arises from the presence of different gyromagnetic ratios of the sublattices, which generates significant variations particularly in the vicinity of the angular momentum compensation point. In this paper, we demonstrate that, in the vicinity of the angular momentum compensation point, FLT can act as a main driving term for magnetization switching in ferrimagnets through rigorous mathematical analysis and ferrimagnetic macrospin simulation. We also provide clear indications about the materials damping factor on how to tailor the magnetic layer where a charge current is injected. These findings shed light on the intricate behavior of SOT in ferrimagnetic systems and pave a way for further advancements in high-performance magnetic memory devices.

中文翻译：

稀土过渡金属合金中的场状扭矩驱动开关

自旋轨道扭矩（SOT）已被广泛认可并应用为最有前途的磁存储器方法，这主要是由于其较低的能耗和较长的设备寿命。然而，SOT 的机制在亚铁磁体中仍然存在争议，特别是在类场扭矩 (FLT) 的作用方面。这种不确定性是由于子晶格不同旋磁比的存在而引起的，这会产生显着的变化，特别是在角动量补偿点附近。在本文中，我们通过严格的数学分析和亚铁磁宏观自旋模拟证明，在角动量补偿点附近，FLT可以作为亚铁磁体磁化翻转的主要驱动项。我们还提供了有关如何定制注入充电电流的磁性层的材料阻尼系数的明确指示。这些发现揭示了 SOT 在亚铁磁系统中的复杂行为，并为高性能磁存储器件的进一步发展铺平了道路。

更新日期：2024-09-10

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