Open AccessInfluence of internal geometry on magnetization reversal in asymmetric permalloy rings
Author(s) -
Daniel B. Gopman,
Yuri Kabanov,
Jizhai Cui,
Christopher S. Lynch,
Robert D. Shull
Publication year - 2016
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.4961881
Subject(s) - permalloy , condensed matter physics , magnetometer , ferromagnetism , magnetization , magnetization reversal , materials science , geomagnetic reversal , magnetic domain , metastability , micromagnetics , vortex , domain wall (magnetism) , magnetic anisotropy , physics , magnetic field , mechanics , quantum mechanics
We report the magnetization reversal behavior of microstructured Ni 80 Fe 20 rings using magneto-optic indicator film imaging and magnetometry. While the reversal behavior of rings with a symmetric (circular) interior hole agrees with micromagnetic simulations of an onion → vortex → onion transition, we experimentally demonstrate that rings possessing an elliptical hole with an aspect ratio of 2 exhibit complex reversal behavior comprising incoherent domain propagation in the rings. Magneto optic images reveal metastable magnetic configurations that illustrate this incoherent behavior. These results have important implications for understanding the reversal behavior of asymmetric ferromagnetic rings.