Switching of magnetic skyrmion cores in nanodots

Microwave-induced dynamic switching of magnetic skyrmion cores in nanodots.
Bin Zhang, Weiwei Wang, Marijan Beg, Hans Fangohr and Wolfgang Kuch

Appl. Phys. Lett. 106, 102401 (2015)

Spin dynamics of the skyrmion excited by an AC magnetic field hωz=hω sin(ωt) with hω=2.4×10−3 up to time 25 000 (∼16.5 ns for J = 1 meV and S = 1). Selected time evolution of the magnetization distribution with two examples: (a) ωa  = 3.6 × 10⁻³, taoff=1750 and (b) ωb  = 1.4 × 10⁻², tboff=5600 . The color-coded mz (out-of-plane) and mx (in-plane) components of the magnetization are displayed in the first and third line, respectively, while the second line displays a perspective view (topography) with the color code of mz . (c) Time trace of the magnetization component mz (top graph), the AC magnetic field (dashed lines), and the skyrmion number (both in bottom graph). Black and red lines refer to the data of the two different examples, while the black circles and red prisms indicate the times corresponding to the snapshots shown in (a) and (b), respectively