DocumentCode :
907041
Title :
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
Link To Document :
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