Width dependent auto-oscillating properties of constriction based spin Hall nano-oscillators

被引：24

作者：

Awad, Ahmad A. ^{[1
]}

Houshang, Afshin ^{[1
]}

Zahedinejad, Mohammad ^{[1
]}

Khymyn, Roman ^{[1
]}

Akerman, Johan ^{[1
,2
]}

机构：

[1] Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden

[2] KTH Royal Inst Technol, Mat & Nanophys, Sch Engn Sci, S-16440 Kista, Sweden

来源：

APPLIED PHYSICS LETTERS | 2020年 / 116卷 / 23期

基金：

欧盟地平线“2020”; 瑞典研究理事会; 欧洲研究理事会;

关键词：

DRIVEN;

D O I：

10.1063/5.0007254

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We study the current tunable microwave signal properties of nano-constriction-based spin Hall nano-oscillators in oblique magnetic fields as a function of the nano-constriction width, w = 50 - 140 nm. The threshold current is found to scale linearly with w, defining a constant threshold current density of Jth = 1.7 x 10(8) A/cm(2). While the current dependence of the microwave frequency shows the same generic non-monotonic behavior for all w >= 80 nm, the quality of the generated microwave signal improves strongly with w, as the total power increases and the linewidth decreases linearly with w. As a consequence, the peak power for a 140 nm nano-constriction is about an order of magnitude higher than that for an 80 nm nano-constriction. The smallest nano-constriction, w = 50 nm, exhibits a different behavior with a higher power and a worse linewidth, indicating a crossover into a qualitatively different narrow-constriction regime.

引用

页数：4

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