Oscillation characteristics of zero-field spin transfer oscillators with field-like torque
Source abstract
Abstract
We theoretically investigate the influence of the field-like spin torque term on the oscillation characteristics of spin transfer oscillators, which are based on MgO magnetic tunnel junctions (MTJs) consisting of a perpendicular magnetized free layer and an in-plane magnetized pinned layer. It is demonstrated that the field-like torque has a strong impact on the steady-state precession current region and the oscillation frequency. In particular, the steady-state precession can occur at zero applied magnetic field when the ratio between the field-like torque and the spin transfer torque takes up a negative value. In addition, the dependence of the oscillation properties on the junction sizes has also been analyzed. The results indicate that this compact structure of spin transfer oscillator without the applied magnetic field is practicable under certain conditions, and it may be a promising configuration for the new generation of on-chip oscillators.
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Research context
OpenAlex topics: Magnetic properties of thin films · Physics of Superconductivity and Magnetism · Magnetic and transport properties of perovskites and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Taiyuan University of Technology 1 Key Laboratory of Advanced Transducer and Intelligent Control system, Ministry of Education, , Taiyuan 030024, China
Taiyuan University of Technology 2 Department of Physics and Optoelectronics, , Taiyuan 030024, China
National University of Singapore 3 Department of Electrical and Computer Engineering, , Singapore 117576
Funding
National Natural Science Foundation of China
References (39)
Show source-provided references
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