@article{oai:nitech.repo.nii.ac.jp:00005182,
 author = {Okuno, T. and Mibu, Ko and Shinjo, T.},
 issue = {7},
 journal = {JOURNAL OF APPLIED PHYSICS},
 month = {Apr},
 note = {Elliptical (track-shaped) permalloy (Ni19Fe81) dots, in which magnetic circular vortex and antivortex structures are stabilized, were prepared and the magnetic properties of perpendicular magnetization spots (turned-up magnetizations) at the cores of both types of vortices were studied. Using magnetic force microscopy, the direction of the turned-up magnetization was detected and the switching field was measured. It was found that the value of the switching field of the turned-up magnetization at the antivortex core is smaller by about 1000 Oe than that at the circular vortex core. It was confirmed that the switching of the turned-up magnetization in the antivortex is not influenced by the directions of the turned-up magnetizations in the neighboring circular vortices. Vanishing and regenerating processes of turned-up magnetizations were observed by increasing and decreasing the magnetic field applied to the in-plane direction., application/pdf},
 pages = {3612--3617},
 title = {Two types of magnetic vortex cores in elliptical permalloy dots},
 volume = {95},
 year = {2004}
}