Field-Free Mutual Synchronization of Parallel Coupled Spin Torque Nano Oscillators Using a Free Layer With First- and Second-Order Uniaxial Anisotropy

IF 2.1 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Magnetics Pub Date : 2024-11-11 DOI:10.1109/TMAG.2024.3495025

Meenakshi Sravani;Swapnil Bhuktare

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Abstract

The synchronization behavior of two spin torque nano oscillators (STNOs) with second-order anisotropy, connected via parallel coupling, has been studied in the presence of the thermal field. The second-order anisotropy led to the biasing of the free layer (FL) of both the STNOs in the easy cone regime called the conical FL (CFL). This parallel coupling facilitated frequency and in-phase synchronization between the two STNOs without the need for any external field. The simulation results demonstrating this in-phase synchronization have been supported by analytical theory. Further, the effects of parallel coupling on oscillation parameters, such as frequency, power, and linewidth, have been examined. The variation of the frequency with current and the coupling factor has been derived using the LLGS equation. The study achieved a threefold increase in output power and a reduction in linewidth to the order of kHz, without requiring an external field. These advancements highlight the potential of the device for reliable practical applications.

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利用一阶和二阶单轴各向异性自由层的平行耦合自旋力矩纳米振荡器的无场相互同步

研究了两个二阶各向异性自旋力矩纳米振荡器（STNOs）在热场存在下的同步行为。二阶各向异性导致两种STNOs的自由层（FL）在易锥区发生偏置，称为锥形FL （CFL）。这种并联耦合促进了两个STNOs之间的频率和相位同步，而不需要任何外部场。仿真结果证实了这种同步的正确性，并得到了解析理论的支持。此外，平行耦合对振荡参数的影响，如频率，功率和线宽，已经被检查。利用LLGS方程推导了频率随电流和耦合系数的变化规律。该研究实现了输出功率增加三倍，线宽减少到千赫数量级，而不需要外部场。这些进步突出了该设备在可靠的实际应用中的潜力。

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.