Microwave emission power exceeding 10 μW in spin torque vortex oscillator

被引：45

作者：

Tsunegi, Sumito ^{[1
]}

Yakushiji, Kay ^{[1
]}

Fukushima, Akio ^{[1
]}

Yuasa, Shinji ^{[1
]}

Kubota, Hitoshi ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Spintron Res Ctr, Tsukuba, Ibaraki, Japan

来源：

APPLIED PHYSICS LETTERS | 2016年 / 109卷 / 25期

关键词：

MAGNETIC TUNNEL-JUNCTIONS; POLARIZED CURRENT; ROOM-TEMPERATURE; MAGNETORESISTANCE; DRIVEN; GENERATION; PHASE;

D O I：

10.1063/1.4972305

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We fabricated vortex-type spin-torque oscillators (STOs) with optimized structures to enhance the microwave emission power. Inserting a thin Co70Fe30 layer between the MgO tunnel barrier and Fe-B free layer of the STOs resulted in the magnetoresistance ratio up to 190% with a resistance area (RA) value of 4.1 Omega mu m(2), which contributed to a large enhancement of the emission power. The optimized STO exhibited the emission power of 10.1 mu W, which is the highest power from a single STO reported to date, with excellent frequency stability (f(STO)/Delta f = 2000 with the timing jitter of 12 ps). The results suggest that the vortex-STOs are promising candidates for next generation microwave generators. Published by AIP Publishing.

引用

页数：4

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