Optical manipulation of magnetic vortices visualized in situ by Lorentz electron microscopy.

ABSTRACT: Understanding the fundamental dynamics of topological vortex and antivortex naturally formed in microscale/nanoscale ferromagnetic building blocks under external perturbations is crucial to magnetic vortex-based information processing and spintronic devices. All previous studies have focused on magnetic vortex-core switching via external magnetic fields, spin-polarized currents, or spin waves, which have largely prohibited the investigation of novel spin configurations that could emerge from the ground states in ferromagnetic disks and their underlying dynamics. We report in situ visualization of femtosecond laser quenching-induced magnetic vortex changes in various symmetric ferromagnetic Permalloy disks by using Lorentz phase imaging of four-dimensional electron microscopy that enables i

SUBMITTER: Fu X 

PROVIDER: S-EPMC6054509 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature