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Novel Method for Reducing Operation Current in Magnetic Domain-Wall Motion by the Use of Curved Wedge Nanowire

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3 Author(s)
Kab-Jin Kim ; Dept. of Phys., Seoul Nat. Univ., Seoul, South Korea ; Sang-Jun Yun ; Sug-Bong Choe

We propose a method to reduce the operation current of domain-wall (DW) motion in ferromagnetic nanowires with perpendicular magnetic anisotropy. It is based on the phenomena that a DW placed in wedged nanowire geometry moves spontaneously without any external magnetic field by consumption of the DW energy. Based on energy consideration, we found that there exists a geometry-induced effective field, which depends solely on the radius of circular arc intersecting normal to both the nanowire edges. Geometry for a constant effective field is analytically given with a curved wedge shape, which keeps the radius unchanged irrespective of the DW position. The validity of the analytic prediction is confirmed by a micromagnetic simulation.

Published in:

IEEE Transactions on Magnetics  (Volume:47 ,  Issue: 10 )