Capacitance Effect on Microwave Power Spectra of Spin-Torque Oscillator With Thermal Noise

Author

Zhou, Yan ; Shin, Franklin G. ; Guan, Bo ; Åkerman, Johan

Author_Institution

Dept. of Microelectron. & Appl. Phys., R. Inst. of Technol., Kista

Volume

45

Issue

6

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

2773

Lastpage

2776

Abstract

A macro-spin simulation has been carried out to study the thermal stability of a spin-torque oscillator (STO) connected in parallel with a capacitance. To study the impact of realistic thermal fluctuation on an STO, a stochastic magnetic field vector is added into the Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equation. From the numerical solution, it is found that the addition of capacitance positively influences the thermal stability of the system, and can improve the quality factor of the microwave power spectrum even in the presence of thermal fluctuation. The results of I-V phase shift under different conditions suggest that there may exist an optimum capacitance for which the thermal stability of the system can be most enhanced.

Keywords

Q-factor; capacitance; microwave spectra; noise; oscillators; stochastic processes; thermal stability; I-V phase shift; Landau-Lifshitz-Gilbert-Slonczewski equation; capacitance effect; macrospin simulation; microwave power spectra; quality factor; spin-torque oscillator; stochastic magnetic field vector; thermal fluctuation; thermal noise; thermal stability; Macrospin model; spin-torque oscillator; thermal fluctuation;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2009.2020556

Filename

4957822