Magnetic vortex core observation in circular dots of permalloy
Spin structures of nanoscale magnetic dots are the subject of increasing scientific effort, as the confinement of spins imposed by the geometrical restrictions makes these structures comparable to some internal characteristic length scales of the magnet. For a vortex (a ferromagnetic dot with a curling magnetic structure), a spot of perpendicular magnetization has been theoretically predicted to exist at the center of the vortex. Experimental evidence for this magnetization spot is provided by magnetic force microscopy imaging of circular dots of permalloy (Ni(80)Fe(20)) 0.3 to 1 micrometer in diameter and 50 nanometers thick.
Shinjo
T
Institute for Chemical Research, Kyoto University, Uji 611-0011, Japan. Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan.
Okuno
T
Hassdorf
R
Shigeto
K
Ono
T