Geometry induced phase transitions in magnetic spherical shell

Abstract

Equilibrium magnetization states in thin spherical shells of a magnetically soft ferromagnet are determined by the competition between two interactions: (i) The local exchange interaction favours the more homogeneous onion state with magnetization oriented in meridian directions; such a state is realized in relatively small particles. (ii) The nonlocal magnetostatic interaction prefers the double-vortex configuration with the magnetization oriented in the parallels directions, since it minimizes the volume magnetostatic charges. These sates are topologically equivalent, in contrast to the same-name states of magnetic nanoring. As a consequence, a continuous (the second order) phase transition between the vortex and onion states takes place. The detailed analytical description of the phase diagram is well confirmed by micromagnetic simulations.

arXiv comment11 pages, 6 figures

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Cited by in corpus (8)

• Micromagnetic Theory of Curvilinear Ferromagnetic Shells
• Curvature effects on phase transitions in chiral magnets
• Nematic versus ferromagnetic shells: new insights in curvature-induced effects
• Change in the magnetic configurations of tubular nanostructures by tuning dipolar interactions
• Reduced energies for thin ferromagnetic films with perpendicular anisotropy
• Orientational ordering of point dipoles on a sphere
• Controlling magnetisation's reversal mechanism and hyperthermia efficiency in core/shell magnetic nanoparticles by tuning the interphase coupling
• Impact of curvature-induced Dzyaloshinskii-Moriya interaction on magnetic vortex texture in spherical caps