Abstract
Single crystal Co films (c-axis parallel to the surface normal) were epitaxially deposited onto Al2O3 (00.1) substrates, and from these films, Co particles with diameters of 0.5, 1, and 2.5 um were patterned. Magnetic domain structures were observed by magnetic force microscopy (MFM) with temperature up to 200 deg C. For the 220 nm thick sample's case, maze patterns were clearly observed both in the film and the particles. MFM images taken at elevated temperatures do not show drastic change in the domain patterns. For the 56 nm thick sample's case, maze type domain structure in the original film turns to concentric type structure after patterning into particles, and the domain structure exhibits vortex at 200 deg C.
