| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Zero-Magnetic-Field Oscillation of Spin Transfer Nano-Oscillator with a Second-Order-Perpendicular-Anisotropy Free Layer |
| Yuan-Yuan Guo1,2, Fei-Fei Zhao1,2, Hai-Bin Xue1,2**, Zhe-Jie Liu1,2 |
1Key Laboratory of Advanced Transducers & Intelligent Control System (Ministry of Education), Taiyuan University of Technology, Taiyuan 030024
2College of Physics & Optoelectronics, Taiyuan University of Technology, Taiyuan 030024
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| Cite this article: |
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Yuan-Yuan Guo, Fei-Fei Zhao, Hai-Bin Xue et al 2016 Chin. Phys. Lett. 33 037501 |
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Abstract The zero-magnetic-field oscillation behavior of spin torque nano-oscillator (STNO) with a perpendicularly magnetized free layer with second-order uniaxial anisotropy is studied theoretically based on the Landau–Lifshitz–Gilbert–Slonczewski equation. It is demonstrated numerically that the second-order uniaxial anisotropy plays a significant role in the occurrence of a zero-magnetic-field steady-state precession, which can be understood in terms of the energy balance between the energy accumulation due to the spin torque and the energy dissipation due to the Gilbert damping. In particular, a relatively large zero-magnetic-field-oscillation current region, in which the corresponding microwave frequency is increased while the threshold current still maintains an almost constant value, can be obtained by modulating the second-order uniaxial anisotropy of the free layer. These results suggest a tunable zero-magnetic-field STNO, and it may be a promising configuration for STNO's applications in future wireless communications.
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Received: 25 November 2015
Published: 31 March 2016
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| PACS: |
75.78.-n
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(Magnetization dynamics)
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85.75.-d
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(Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)
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76.50.+g
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(Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance)
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