Hybrid Switching of Perpendicular Magnetization in Assistance With In-Plane Uniaxial Shape Anisotropy

IF 1.9 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Magnetics Pub Date : 2025-08-07 DOI:10.1109/TMAG.2025.3596631

Heston A. Mendonca;Ashwin A. Tulapurkar

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引用次数: 0

Abstract

The spin–orbit torque (SOT) mechanism is a highly efficient method for switching the magnetization of magnetic tunnel junctions (MTJs) with perpendicular anisotropy. However, the need for an in-plane magnetic field for the deterministic switching of MTJs restricts their practical applications. Hence, a hybrid approach of the spin-transfer torque (STT) along with SOT is often employed. An alternate approach for field-free switching is to use an elliptical MTJ whose axis is tilted at a certain angle with that of a heavy metal. This method uses in-plane uniaxial shape anisotropy along with SOT for deterministic switching. Here, we study a five-terminal perpendicular magnetic anisotropy (PMA) MTJ having an elliptical cross section, switched using both the hybrid approach and the uniaxial shape anisotropy. The switching probability of this device is simulated using the Landau–Lifshitz–Gilbert (LLG) equation and compared to that of a three-terminal MTJ having a circular cross section. Our results show that the elliptical MTJ exhibits better switching probability than the circular MTJ. Additionally, we analyze key parameters that can enhance the switching probability of the elliptical MTJ.

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平面内单轴形状各向异性辅助下垂直磁化的混合开关

自旋轨道转矩（SOT）机制是切换垂直各向异性磁性隧道结（MTJs）磁化特性的一种高效方法。然而，MTJs的确定性开关对面内磁场的需求限制了其实际应用。因此，通常采用自旋传递扭矩（STT）与SOT的混合方法。无场开关的另一种方法是使用椭圆MTJ，其轴与重金属的轴倾斜一定角度。该方法利用平面内单轴形状各向异性和SOT进行确定性开关。本文研究了具有椭圆截面的五端垂直磁各向异性（PMA） MTJ，该MTJ采用混合方法和单轴形状各向异性开关。利用Landau-Lifshitz-Gilbert （LLG）方程模拟了该器件的开关概率，并与具有圆形截面的三端MTJ的开关概率进行了比较。结果表明，椭圆型MTJ比圆形MTJ具有更好的开关概率。此外，我们还分析了提高椭圆MTJ开关概率的关键参数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Magnetics 工程技术-工程：电子与电气

CiteScore

4.00

自引率

14.30%

发文量

565

审稿时长

4.1 months

期刊介绍： Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The IEEE Transactions on Magnetics publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.