Experimental Evidence of Self-Localized and Propagating Spin Wave Modes in Obliquely Magnetized Current-Driven Nanocontacts

被引：172

作者：

Bonetti, Stefano ^{[1
]}

Tiberkevich, Vasil ^{[2
]}

Consolo, Giancarlo ^{[3
,4
,5
]}

Finocchio, Giovanni ^{[5
]}

Muduli, Pranaba ^{[6
]}

Mancoff, Fred ^{[7
]}

Slavin, Andrei ^{[2
]}

Akerman, Johan ^{[1
,6
]}

机构：

[1] Royal Inst Technol, S-16440 Kista, Sweden

[2] Oakland Univ, Dept Phys, Rochester, MI 48309 USA

[3] Univ Ferrara, Dept Phys, I-44100 Ferrara, Italy

[4] Univ Ferrara, CNISM, I-44100 Ferrara, Italy

[5] Univ Messina, Dept Matter Phys & Elect Engn, Messina, Italy

[6] Univ Gothenburg, Dept Phys, Gothenburg, Sweden

[7] Everspin Technologies Inc, Chandler, AZ USA

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 21期

基金：

瑞典研究理事会; 美国国家科学基金会;

关键词：

ELECTRIC-CURRENT; EXCITATION; MULTILAYER;

D O I：

10.1103/PhysRevLett.105.217204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Through detailed experimental studies of the angular dependence of spin wave excitations in nanocontact-based spin-torque oscillators, we demonstrate that two distinct spin wave modes can be excited, with different frequency, threshold currents, and frequency tunability. Using analytical theory and micromagnetic simulations we identify one mode as an exchange-dominated propagating spin wave, and the other as a self-localized nonlinear spin wave bullet. Wavelet-based analysis of the simulations indicates that the apparent simultaneous excitation of both modes results from rapid mode hopping induced by the Oersted field.

引用

页数：4

共 20 条

[11] Area dependence of high-frequency spin-transfer resonance in giant magnetoresistance contacts up to 300 nm diameter [J].