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

Journal Article · Fri Aug 07 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4927621· OSTI ID:22494684

Taniguchi, Tomohiro; Tsunegi, Sumito; Kubota, Hitoshi ^[1]; Ito, Takahiro; Utsumi, Yasuhiro ^[2]

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1. National Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba 305-8568 (Japan)
2. Faculty of Engineering, Mie University, Tsu, Mie 514-8507 (Japan)

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.

• OSTI ID: 22494684
• Journal Information: Journal of Applied Physics, Vol. 118, Issue 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANALYTICAL SOLUTION
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
CURRENTS
LAYERS
MAGNETIC FIELDS
MAGNETIZATION
OSCILLATIONS
OSCILLATORS
SPIN
TORQUE