Micromagnetic analysis of injection locking in spin-transfer nano-oscillators

被引：37

作者：

d'Aquino, M. ^{[1
]}

Serpico, C. ^{[2
]}

Bonin, R. ^{[3
]}

Bertotti, G. ^{[4
]}

Mayergoyz, I. D. ^{[5
,6
]}

机构：

[1] Univ Napoli Parthenope, Dipartimento Tecnol, I-80143 Naples, Italy

[2] Univ Naples Federico II, Dipartimento Ingn Elettr, I-80125 Naples, Italy

[3] Politecn Torino Sede Verres, I-11029 Verres, Aosta, Italy

[4] Ist Nazl Ric Metrol INRiM, I-10135 Turin, Italy

[5] Univ Maryland, ECE Dept, College Pk, MD 20742 USA

[6] Univ Maryland, UMIACS, College Pk, MD 20742 USA

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 06期

关键词：

POLARIZED CURRENT; MAGNETIC MULTILAYERS; MICROWAVE GENERATION; THERMAL FLUCTUATIONS; PHASE-LOCKING; DRIVEN; INTEGRATION; EXCITATION; EQUATION;

D O I：

10.1103/PhysRevB.82.064415

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The injection-locking mechanism of a spin-transfer nano-oscillator is studied for a system which is traversed by a spin-polarized electric current with both dc and ac components. The uniform mode theory is used to predict the control parameters for the synchronization between the magnetization self-oscillation and the external microwave current. It is found that micromagnetic simulations at zero temperature are in very good agreement with the theory, showing that magnetization dynamics is practically uniform in space. Then, the effect of temperature on synchronized regimes is analyzed. The locking band as well as the hysteretic character of the oscillation response are determined as function of the control parameters. Computations of the power spectral densities (PSD) of injection-locked and unlocked oscillations reveal that synchronized oscillations are quite stable with respect to thermal fluctuations. Secondary peaks in the PSD of injection-locked oscillations are reported and theoretically explained.

引用

页数：11

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