Self-Injection Locking of a Spin Torque Nano-Oscillator to Magnetic Field Feedback

被引：13

作者：

Singh, Hanuman ^{[1
]}

Bose, A. ^{[1
]}

Bhuktare, S. ^{[1
]}

Fukushima, A. ^{[2
]}

Yakushiji, K. ^{[2
]}

Yuasa, S. ^{[2
]}

Kubota, H. ^{[2
]}

Tulapurkar, Ashwin A. ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Elect Engn, Bombay 400076, Maharashtra, India

[2] Nat Inst Adv Ind Sci & Technol AIST, Spintron Res Ctr, Ibaraki 3058568, Japan

来源：

PHYSICAL REVIEW APPLIED | 2018年 / 10卷 / 02期

关键词：

MICROWAVE GENERATION; DRIVEN; EMISSION;

D O I：

10.1103/PhysRevApplied.10.024001

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We demonstrate the self-synchronization of a spin torque nano-oscillator (STNO) using magnetic field feedback. The rf output of the STNO is connected to a waveguide which rests on top of the magnetic tunnel junction (MTJ). The resulting rf current flowing through the waveguide creates a magnetic field on the free layer of the MTJ, which acts as the feedback. We observe a large improvement in the quality factor as the feedback strength is increased. Our results indicate a transition to an oscillatory state dominated by feedback at higher feedback strength. We also explore the effect of feedback phase on magnetization oscillation by inserting an adjustable delay in the feedback path. The experimental results are qualitatively supported by macromagnetic simulation. Our results open an alternative avenue to control the magnetization dynamics of a nanomagnet.

引用

页数：6

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