Micromagnetic study of spin transfer switching with a spin polarization tilted out of the free layer plane

We present the results of zero temperature macrospin and micromagnetic simulations of spin transfer switching of thin film nanomagnets in the shape of an ellipse with a spin-polarization tilted out of the layer plane. The perpendicular component of the spin-polarization is shown to increase the reve...

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Bibliographic Details
Published in:Journal of applied physics 2015-05, Vol.117 (17)
Main Authors: Chaves-O'Flynn, Gabriel D., Wolf, Georg, Pinna, Daniele, Kent, Andrew D.
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Critical angle
ELECTRIC CURRENTS
EXCITATION
MAGNETIC MATERIALS
MAGNETIZATION
MAGNETS
NANOSTRUCTURES
Polarization (spin alignment)
PRECESSION
SPIN
SPIN ORIENTATION
Switching
TEMPERATURE ZERO K
THIN FILMS
VELOCITY
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Summary:We present the results of zero temperature macrospin and micromagnetic simulations of spin transfer switching of thin film nanomagnets in the shape of an ellipse with a spin-polarization tilted out of the layer plane. The perpendicular component of the spin-polarization is shown to increase the reversal speed, leading to a lower current for switching in a given time. However, for tilt angles larger than a critical angle, the layer magnetization starts to precess about an out-of-plane axis, which leads to a final magnetization state that is very sensitive to simulation conditions. As the ellipse lateral size increases, this out-of-plane precession is suppressed, due to the excitation of spatially non-uniform magnetization modes.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4907241