**Authors:**

Volodymyr P. Kravchuk, Denis 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.