Spin torque oscillator for microwave assisted magnetization reversal

Thermally assisted spin-transfer torque magnetization reversal in uniaxial nanomagnets

We simulate the stochastic Landau-Lifshitz-Gilbert dynamics of a uniaxial nanomagnet out to sub-millisecond timescales using a graphical processing unit based micromagnetic code and determine the effect of geometrical tilts between the spin-current and uniaxial anisotropy axes on the thermally assisted reversal dynamics. The asymptotic behavior of the switching time (I ! 0; hsi / expð"nð1 " IÞÞ...

Microwave assisted magnetization reversal in composite media

Shaojing Li, Boris Livshitz, H. Neal Bertram, Manfred Schabes, Thomas Schrefl, Eric E. Fullerton, and Vitaliy Lomakin Department of Electrical and Computer Engineering and the Center for Magnetic Recording Research, University of California, San Diego, California 92093, USA Hitachi San Jose Research Center, San Jose, California 95135, USA Department of Engineering Materials, University of Sheff...

Investigation of spin torque driven magnetization reversal in elliptical elements

Magnetization Dynamics Symmetry in Spin Torque Induced Magnetization Switching

Magnetization dynamics symmetry plays important roles in magnetization switching. Here we study magnetic field and spin torque induced magnetization switching. Spin moment transferring from polarized itinerant electrons to local magnetization provides a magnetization switching mechanism without using external magnetic field. Besides its importance in fundamental magnetization switching dynamics...

Direct observation of spin-torque driven magnetization reversal through nonuniform modes.

We present time-resolved x-ray images with 30 nm spatial and 70 ps temporal resolution, which reveal details of the spatially resolved magnetization evolution in nanoscale samples of various dimensions during reversible spin-torque switching processes. Our data in conjunction with micromagnetic simulations suggest a simple unified picture of magnetic switching based on the motion of a magnetic ...