Title :
Role of Magnetic Field in Self-Oscillation of Nanomagnet Excited by Spin Torque
Author :
Taniguchi, Takafumi ; Tamaru, Shingo ; Arai, Hiroyuki ; Tsunegi, Sumito ; Kubota, Hajime ; Imamura, Hiroshi
Author_Institution :
Spintronics Res. Center, Nat. Inst. of Adv. Ind. Sci. & Technol., Tsukuba, Japan
Abstract :
The critical current of the self-oscillation of a spin torque oscillator consisting of a perpendicularly magnetized free layer and an in-plane magnetized pinned layer was studied by solving the Landau-Lifshitz-Gilbert equation. We found that the critical current diverged at certain field directions, indicating that the self-oscillation does not occur at these directions. It was also found that the sign of the critical current changed depending on the applied field direction.
Keywords :
critical currents; magnetic tunnelling; magnetisation; magnetoelectronics; nanomagnetics; oscillators; Landau-Lifshitz-Gilbert equation; critical current; in-plane magnetized pinned layer; magnetic field; nanomagnet self-oscillation; perpendicularly magnetized free layer; spin torque oscillator; Critical current density (superconductivity); Magnetic tunneling; Magnetomechanical effects; Oscillators; Perpendicular magnetic anisotropy; Torque; Critical current; perpendicularly magnetized free layer; spin torque oscillator (STO); spintronics;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2014.2326186
