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Local Probing of Vortex Core Movement in a Ni–Fe Disk Using Magnetic Field Sweeping-Magnetic Force Microscopy
Yasushi Endo,
Isao Sasaki1,
Ryoichi Nakatani1,2, and
Masahiko Yamamoto1
Department of Electrical and Communication Engineering, Graduate School of Engineering, Tohoku University, Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
1Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
2Center for Atomic and Molecular Technologies, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
(Received September 20, 2008; revised January 13, 2009; accepted March 6, 2009; published online June 22, 2009)
We have studied the magnetization reversal in a 40-nm-thick Ni–Fe disk with a diameter of 600 nm using magnetic field sweeping (MFS)-magnetic force microscopy (MFM). All the points within the disk, which are perpendicular to the magnetic field, show marked changes in phase as the magnetic field is varied. These results demonstrate that the vortex core nucleates at the disk edge, moves quickly around a point which is 100 nm away from the center of the disk, moves from that point to the opposite disk edge, and further annihilates at that edge. Additionally, at local points near the disk edge, at which the vortex core annihilates, a sharp phase decrease or increase is observed as the magnetic field is varied, caused by the chirality of the vortex core in the disk. Therefore, it is concluded that the detailed vortex core movement in a disk can be successfully observed using MFS-MFM.
URL:
http://jjap.jsap.jp/link?JJAP/48/066502/
DOI: 10.1143/JJAP.48.066502
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