Magnetization reversal in particulate L10 nanostructures

Thermally assisted magnetization reversal in nanostructures

Magnetization reversal in Co nanostructures is simulated over a wide range of time-scales, from fast switching processes on a ps time-scale to thermally activated reversal on a μs time-scale. Langevin dynamics is used as well as time quantified Monte Carlo methods for the simulation of a classical spin system modeling elongated Co nano-particles. We study the behavior of the magnetization durin...

Demonstration of laser induced magnetization reversal in GdFeCo nanostructures

Magnetization reversal mechanism of perpendicularly exchange-coupled composite L10-FePt/CoCrPt bilayers

Magnetization reversal mechanism in perpendicularly exchange-coupled composite hard/soft L10-FePt /CoCrPt bilayers with different soft layer thickness has been studied using magnetometry and magnetotransport measurements. For thin soft layers, the magnetization reversal process can be described by the rigid model. For thick soft layers, a different magnetization reversal process is observed whi...

Magnetization noise in magnetoelectronic nanostructures.

By scattering theory we show that spin current noise in normal electric conductors in contact with nanoscale ferromagnets increases the magnetization noise by means of a fluctuating spin-transfer torque. Johnson-Nyquist noise in the spin current is related to the increased Gilbert damping due to spin pumping, in accordance with the fluctuation-dissipation theorem. Spin current shot noise in the...

Quasiballistic magnetization reversal.

We demonstrate a quasiballistic switching of the magnetization in a microscopic magnetoresistive memory cell. By means of time resolved magnetotransport, we follow the large angle precession of the free layer magnetization of a spin valve cell upon application of transverse magnetic field pulses. Stopping the field pulse after a 180 degrees precession rotation leads to magnetization reversal wi...