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arXiv · 1508.00601

Stable oscillation in spin torque oscillator excited by a small in-plane magnetic field

Tomohiro Taniguchi·Takahiro Ito·Yasuhiro Utsumi·Sumito Tsunegi·Hitoshi Kubota
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Abstract

Theoretical conditions to excite self-oscillation in a spin torque oscillator consisting of a perpendicularly magnetized free layer and an in-plane magnetized pinned layer are investigated by analytically solving the Landau-Lifshitz-Gilbert equation. The analytical relation between the current and oscillation frequency is derived. It is found that a large amplitude oscillation can be excited by applying a small field pointing to the direction anti-parallel to the magnetization of the pinned layer. The validity of the analytical results is confirmed by comparing with numerical simulation, showing good agreement especially in a low current region.

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Tomohiro Taniguchi, Takahiro Ito, Yasuhiro Utsumi, Sumito Tsunegi, Hitoshi Kubota. 2015-08-03. Stable oscillation in spin torque oscillator excited by a small in-plane magnetic field. https://doi.org/10.1063/1.4927621

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