Terahertz Spin Transfer Torque Oscillator Based on a Synthetic Antiferromagnet

Bloch-Bloembergen-Slonczewski equation is adopted to simulate magnetization dynamics in spin-valve based spin-transfer torque oscillator with synthetic antiferromagnet acting as a free magnetic layer. High frequency up to the terahertz scale is predicted in synthetic antiferromagnet spin-transfer to...

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Bibliographic Details
Published inarXiv.org
Main Authors Zhong, Hai, Qiao, Shizhu, Shishen Yan, Zhang, Hong, Qin, Yufeng, Liang, Lanju, Wei, Dequan, Zhao, Yinrui, Kang, Shishou
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 31.07.2018
Subjects
Antiferromagnetism
Oscillators
Relaxation time
Spin dynamics
Spin valves
Spintronics
Stable oscillations
Thickness
Torque
Windows (intervals)
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Summary:Bloch-Bloembergen-Slonczewski equation is adopted to simulate magnetization dynamics in spin-valve based spin-transfer torque oscillator with synthetic antiferromagnet acting as a free magnetic layer. High frequency up to the terahertz scale is predicted in synthetic antiferromagnet spin-transfer torque oscillator with no external magnetic field if the following requirements are fulfilled: antiferromagnetic coupling between synthetic antiferromagnetic layers is sufficiently strong, and the thickness of top (bottom) layer of synthetic antiferromagnet is sufficiently thick (thin) to achieve a wide current density window for the high oscillation frequency. Additionally, the transverse relaxation time of the free magnetic layer should be sufficiently larger compared with the longitudinal relaxation time. Otherwise, stable oscillation cannot be sustained or scenarios similar to regular spin valve-based spin-transfer torque oscillator with relatively low frequency will occur. Our calculations pave a new way for exploring THz spintronics devices.
ISSN:2331-8422