Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M55: Dynamics of Topological Spin Textures
8:00 AM–10:36 AM,
Wednesday, March 8, 2023
Room: Room 305
Sponsoring
Unit:
GMAG
Chair: Timothy Charlton, Oak Ridge National Lab
Abstract: M55.00002 : Generation energetics of skyrmion bubbles concerning perpendicular magnetic anisotropy
8:36 AM–8:48 AM
Presenter:
Albert M Park
(Korea Advanced Institute of Science and Technology)
Authors:
Albert M Park
(Korea Advanced Institute of Science and Technology)
Seungmo Yang
(Korea Research Institute of Standards and Science)
Moojune Song
(Korea Advanced Institute of Science and Technology)
Mujin You
(Korea Advanced Institute of Science and Technology)
Tae-Seong Ju
(Korea Research Institute of Standards and Science)
Chanyong Hwang
(Korea Research Inst of Standards and Sci)
Kab-Jin Kim
(Korea Advanced Institute of Science and Technology)
In this work, we investigate the generation dynamics of skyrmion bubbles in W/CoFeB/Ta/MgO. We insert the Ta wedge layer between CoFeB and MgO to generate a spatial gradient of perpendicular magnetic anisotropy and quantify it using MOKE microscopy. We measure the temporal variation of the skyrmion number after applying an external magnetic field at various temperatures to obtain the activation energy and the attempt time by Arrhenius fitting. The appearance of the Meyer-Neldel-type rule indicates the presence of entropic effects in the nucleation of skyrmions in thin-film CoFeB. We also present a trend in the activation barrier and attempt time with respect to the anisotropy field, demonstrating their role in the skyrmion bubble nucleation process.
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