1. High emission power and Q factor in spin torque vortex oscillator consisting of FeB free layer
- Author
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Makoto Konoto, Hiroko Arai, Hiroshi Imamura, Akio Fukushima, Sumito Tsunegi, Julie Grollier, Vincent Cros, Romain Lebrun, Hitoshi Kubota, Eva Grimaldi, Kay Yakushiji, Shingo Tamaru, and Shinji Yuasa
- Subjects
Emission power ,Materials science ,General Engineering ,General Physics and Astronomy ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Vortex ,Dc current ,Nuclear magnetic resonance ,Q factor ,Torque ,Astrophysics::Earth and Planetary Astrophysics ,Atomic physics ,Spin (physics) ,Layer (electronics) ,Microwave - Abstract
Microwave oscillation properties of spin torque vortex oscillators (STVOs) consisting of an FeB vortex free layer were investigated. Because of a high MR ratio and large DC current, a high emission power up to 3.6 µW was attained in the STVO with a thin FeB free layer of 3 nm. In STOs with a thicker FeB layer, e.g., 10 nm thick, we obtained a large Q factor greater than 6400 while maintaining a large integrated emission power of 1.4 µW. Such excellent microwave performance is a breakthrough for the mutual phase locking of STVOs by electrical coupling.
- Published
- 2014
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