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Metastable Vortex State of Perpendicular Magnetic Anisotropy Free Layer in Spin Transfer Torque Magnetic Tunneling Junctions
Journal of Magnetics, Volume 18, Number 4, 31 Dec 2013, Pages 380-385
Abstract
We find a metastable vortex state of the perpendicular magnetic anisotropy free layer in spin transfer torque magnetic tunneling junctions by using micromagnetic simulations. The metastable vortex state does not exist in a single layer, and it is only found in the trilayer structure with the perpendicular magnetic anisotropy polarizer layer. It is revealed that the physical origin is the non-uniform stray field from the polarizer layer.
Keywords: magnetic random access memory (MRAM); micromagnetic simulation; perpendicular magnetic anisotropy; vortex; spin transfer torque
DOI: http://dx.doi.org/10.4283/JMAG.2013.18.4.380
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