Controlled vortex core switching in a magnetic nanodisk by a rotating field

Authors:

Volodymyr P. KravchukDenis D. Sheka, Yuri Gaididei, Franz G. Mertens

Publication:

J. Appl. Phys. 101, 043908 (2007), 10.1063/1.2770819

Comments:

5 pages, 5 figures

arXiv:

http://arxiv.org/abs/0705.2046

The switching process of the vortex core in a Permalloy nanodisk affected by a rotating magnetic field is studied theoretically. A detailed description of magnetization dynamics is obtained by micromagnetic simulations

Supplementary materials

The switching dymanics of permalloy disk was obtained using OOMMF numerical simulations.

Geometry parameters:

  • shape – disk
  • disk diameter – 132 nm
  • disk thickness – 20 nm

Material parameters:

  • material name – permalloy
  • saturation magnetization – 8.6e5 A/m
  • exchange constant – 1.3e-11 J/m
  • damping constant – 0.006

The dynamics of the perpendicular to the disk plane magnetization component.

The magnetic field orientation is denoted by the arrow. The parameters of applied mag. field are the following:

  • amplitude – 0.02 T
  • frequency – 10 GHz (orientation is oposite to the vortex core polarization)

The dynamics of the in-plane magnetization component.

The out-of-plane magnetic field component is denoted by the levels of gray color. The parameters of applied mag. field are the following:

  • amplitude – 0.07 T
  • frequency – 10 GHz (orientation is oposite to the vortex core polarization)

The dashed blue and the solid yellow curves represent My=0 and Mx=0 isosurfaces, respectively; the black and the white curves correspond to Mz/MS = 0.75 and Mz/MS=-0.75 isosurfaces, respectively.

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