Vortex polarity switching in magnets with surface anisotropy

Vortex polarity switching in magnets with surface anisotropy

Vortex core reversal in magnetic particle is essentially influenced by a surface anisotropy. Under the action of a perpendicular static magnetic field the vortex core undergoes a shape deformation of pillowor barrel-shaped type, depending on the type of the surface anisotropy. This deformation plays a key point in the switching mechanism: We predict that the vortex polarity switching is accompa...

Axial-symmetric Vortex Polarity Switching in Ferromagnetic Particles

Vortex polarity switching by a spin-polarized current.

The spin-transfer effect is investigated for the vortex state of a magnetic nanodot. A spin current is shown to act similarly to an effective magnetic field perpendicular to the nanodot. Then a vortex with magnetization (polarity) parallel to the current polarization is energetically favorable. Following a simple energy analysis and using direct spin-lattice simulations, we predict the polarity...

Magnetic anisotropy in itinerant magnets

Effects of surface anisotropy on magnetic vortex core

The vortex core shape in the three dimensional Heisenberg magnet is essentially influenced by a surface anisotropy. We predict that depending of the surface anisotropy type there appears barrelor pillowshaped deformation of the vortex core along the magnet thickness. Our theoretical study is well confirmed by spin–lattice simulations. & 2014 Elsevier B.V. All rights reserved.