A 20 nm spin Hall nano-oscillator

被引：60

作者：

Durrenfeld, Philipp ^{[1
,2
]}

Awad, Ahmad A. ^{[2
]}

Houshang, Afshin ^{[2
]}

Dumas, Randy K. ^{[2
]}

Akerman, Johan ^{[2
,3
]}

机构：

[1] Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China

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

[3] KTH Royal Inst Technol, Sch Informat & Commun Technol, Dept Mat & Nano Phys, Electrum 229, S-16440 Kista, Sweden

来源：

NANOSCALE | 2017年 / 9卷 / 03期

基金：

欧洲研究理事会; 瑞典研究理事会;

关键词：

MAGNETIC MULTILAYER; DRIVEN; EXCITATION; WAVES; GENERATION;

D O I：

10.1039/c6nr07903b

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Hall nano-oscillators (SHNOs) are an emerging class of pure spin current driven microwave signal generators. Through the fabrication of 20 nm nano-constrictions in Pt/NiFe bilayers, we demonstrate that SHNOs can be scaled down to truly nanoscopic dimensions, with the added benefit of ultra-low operating currents and improved power conversion efficiency. The lateral confinement leads to a strong shape anisotropy field as well as an additional demagnetizing field whose reduction with increasing autooscillation amplitude can yield a positive current tunability contrary to the negative tunability commonly observed for localized excitations in extended magnetic layers. Micromagnetic simulations corroborate the experimental findings and suggest that the active magnetodynamic area resides up to 100 nm outside of the nano-constriction.

引用

页码：1285 / 1291

页数：7

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