Effects of spin-polarized current on pulse field-induced precessional magnetization reversal

Spin-transfer-induced precessional magnetization reversal

A magnetoelectronic device is proposed in which a spin-current pulse produces a rapid reversal of the magnetization of a thin film nanomagnet. A spin-transfer torque induces the reversal and the switching speed is determined by the precession frequency of the magnetization in a thin film element’s demagnetization field. Micromagnetic simulations show that this switching occurs above a threshold...

Spin-current-induced magnetization reversal in magnetic nanowires with constrictions

We have performed experiments on current-induced domain-wall motion sCIDWMd in the case of the domain walls sDWd trapped within the nanoscale constrictions in patterned NiFe structures. Direct observation of current-induced magnetization reversal was achieved and critical current densities jc were measured in the presence of easy-axis magnetic fields. The direction of CIDWM was found to be alon...

Magnetization reversal driven by spin-polarized current in exchange-biased nanoscale spin valves

G. Finocchio,1 I. N. Krivorotov,2 L. Torres,3 R. A. Buhrman,4 D. C. Ralph,4 and B. Azzerboni1 1Dipartimento di Fisica della Materia e Tecnologie Fisiche Avanzate, University of Messina, Salita Sperone 31, 98166 Messina, Italy 2Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA 3Departamento de Fisica Aplicada, Universidad de Salamanca, Plaza de la ...

Effects of a spin-polarized current assisted Ørsted field in magnetization patterning

Thermally activated magnetic reversal induced by a spin-polarized current.

We have measured the statistical properties of magnetic reversal in nanomagnets driven by a spin-polarized current. Like reversal induced by a magnetic field, spin-transfer-driven reversal near room temperature exhibits the properties of thermally activated escape over an effective barrier. However, the spin-transfer effect produces qualitatively different behaviors than an applied magnetic fie...