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http://dx.doi.org/10.4283/JMAG.2013.18.4.380

Metastable Vortex State of Perpendicular Magnetic Anisotropy Free Layer in Spin Transfer Torque Magnetic Tunneling Junctions  

You, Chun-Yeol (Department of Physics, Inha University)
Kim, Hyungsuk (Department of Electrical Engineering, Kwangwoon University)
Publication Information
Journal of Magnetics / v.18, no.4, 2013 , pp. 380-385 More about this Journal
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;
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