We report measurements of spin-torque-driven oscillations in magnetic multilayer devices containing two in-plane-oriented free layers designed to have significant coupling between them. They are driven to oscillate by spin-transfer torque from two perpendicularly oriented polarizers. For both measured devices and micromagnetic simulations, we find that the oscillations in the two free layers are phase locked, resulting in a frequency doubling and large output signals. The simulations suggest that the oscillations are due to spatially nonuniform dynamics characterized by coupled large-amplitude motion of the two free layers.
Phase locking and frequency doubling in spin-transfer-torque oscillators with two coupled free layers / Moriyama, T; Finocchio, G; Carpentieri, Mario; Azzerboni, B; Ralph, Dc; Buhrman, Ra. - In: PHYSICAL REVIEW. B, RAPID COMMUNICATIONS. - ISSN 1082-586X. - 86:6(2012). [10.1103/PhysRevB.86.060411]
Phase locking and frequency doubling in spin-transfer-torque oscillators with two coupled free layers
CARPENTIERI, Mario;
2012-01-01
Abstract
We report measurements of spin-torque-driven oscillations in magnetic multilayer devices containing two in-plane-oriented free layers designed to have significant coupling between them. They are driven to oscillate by spin-transfer torque from two perpendicularly oriented polarizers. For both measured devices and micromagnetic simulations, we find that the oscillations in the two free layers are phase locked, resulting in a frequency doubling and large output signals. The simulations suggest that the oscillations are due to spatially nonuniform dynamics characterized by coupled large-amplitude motion of the two free layers.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
