Dynamics of three-dimensional helical domain wall in cylindrical NiFe nanowires | Zendy

D. W. Wong | Zendy; Chandrasekhar Murapaka | Zendy; W. L. Gan | Zendy; I. Purnama | Zendy; Wen Siang Lew | Zendy

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Dynamics of three-dimensional helical domain wall in cylindrical NiFe nanowires

Author(s) -

D. W. Wong,

Chandrasekhar Murapaka,

W. L. Gan,

I. Purnama,

Wen Siang Lew

Publication year - 2015

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.4919045

Subject(s) - nanowire , condensed matter physics , rotation (mathematics) , clockwise , micromagnetics , vortex , domain wall (magnetism) , materials science , current (fluid) , dynamics (music) , sign (mathematics) , physics , magnetic field , mechanics , geometry , magnetization , nanotechnology , mathematical analysis , mathematics , quantum mechanics , acoustics , thermodynamics

We report on a micromagnetic study on the dynamics of current-driven helical domain wall (DW) in cylindrical NiFe nanowires. The helical DW is a three-dimensional transition region between magnetizations with clockwise and anticlockwise vortex orientations. A minimum current density is needed to overcome an intrinsic pinning to drive the helical DW, and the propagation along the nanowire is accompanied by a rotational motion. As the driving current strength is increased, the rotation ceases while the DW propagates at an increased velocity. However, a velocity barrier is experienced which results in the decrease of the DW mobility. Throughout its motion, the propagated helical DW maintains a stable profile without showing any sign of structural breakdown even at relatively high driving current.

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