Terahertz spin-transfer torque oscillator based on a synthetic antiferromagnet
| Autor: | Shishou Kang, Lanju Liang, Shishen Yan, Shizhu Qiao, Hai Zhong, Yinrui Zhao |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Magnetization dynamics Materials science Spintronics Condensed matter physics Oscillation Terahertz radiation Spin valve Spin-transfer torque 02 engineering and technology Low frequency 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Magnetic field 0103 physical sciences Condensed Matter::Strongly Correlated Electrons 0210 nano-technology |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 497:166070 |
| ISSN: | 0304-8853 |
| Popis: | 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 and frequency window. 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. |
| Databáze: | OpenAIRE |
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