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Circuit-level model of phase-locked spin-torque oscillators

Title
Circuit-level model of phase-locked spin-torque oscillators
Authors
Ahn S.Lim H.Kim M.Shin H.Lee S.
Ewha Authors
신형순이승준
SCOPUS Author ID
신형순scopus; 이승준scopus
Issue Date
2013
Journal Title
Japanese Journal of Applied Physics
ISSN
0021-4922JCR Link
Citation
vol. 52, no. 4 PART 2
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Spin-torque oscillators (STOs) are new oscillating devices based on spintronics technology with many advantageous features, i.e., nanoscale size, high tunability, and compatibility with standard silicon processing. Recent research has shown that two electrically connected STOs may operate as a single device when specific conditions are met. To overcome the limitation of the small output power of STOs, the phase-locking behavior of multiple STOs is hereby extensively investigated. In this paper, we present a circuit-level model of two coupled STOs considering the interaction between them such that it can represent the phase-locking behavior of multiple STOs. In our model, the characteristics of each STO are defined first as functions of applied DC current and external magnetic field. Then, the phase-locking condition is examined to determine the properties of the two coupled STOs on the basis of a theoretical model. The analytic model of two coupled STOs is written in Verilog-A hardware description language. The behavior of the proposed model is verified by circuit-level simulation using HSPICE with CMOS circuits including a current-mirror circuit and differential amplifiers. Simulation results with various CMOS circuits have confirmed the effectiveness of our model. © 2013 The Japan Society of Applied Physics.
DOI
10.7567/JJAP.52.04CM08
Appears in Collections:
엘텍공과대학 > 전자공학과 > Journal papers
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