Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 381, Issue -, Pages 463-469Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2015.01.036
Keywords
Magnetic domains; Pinning; Kerr effect
Funding
- DOE [DE-SC0008148]
- U.S. Department of Energy (DOE) [DE-SC0008148] Funding Source: U.S. Department of Energy (DOE)
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We use a sensitive magneto-optical microscopy technique to image the magnetization response of micron-scale ferromagnetic disks to changes in applied magnetic field. This differential technique relies on a modulated applied magnetic field which allows us to measure changes in magnetization <1% with submicron resolution. The disks are magnetized in single vortex domains, with defects in the material serving to pin the vortex core at particular positions. By applying a small AC magnetic field, we measure the deformation of the magnetization while the core remains pinned. We can also characterize the strength of the pinning site by increasing the AC magnetic field to unpin the vortex core. While pinned, we find that the magnetization away from the core reorients slightly to better align with an applied field. Additionally, an applied field causes the pinned core itself to tilt in the direction of the field. Once the field is large enough to unpin the core, this tilt disappears, and the core instead translates across the disk. (C) 2015 Elsevier B.V. All rights reserved
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