Flux closure structures in cobalt rings.
Measurements are reported on the magnetization reversal in submicron magnetic rings fabricated by high-resolution electron beam lithography and lift-off from cobalt thin films. For all dimensions investigated, with diameters of 300-800 nm and a thickness of 10-50 nm, the flux closure state is the stable magnetization configuration. However, with increasing diameter and decreasing film thickness a metastable near single domain state can be obtained during the reversal process in an in-plane applied field.
Li
S P
SP
Laboratoire de Microstructures et de Microélectronique (CNRS), 196 Avenue H. Ravera, 92225 Bagneux Cedex, France.
Peyrade
D
D
Natali
M
M
Lebib
A
A
Chen
Y
Y
Ebels
U
U
Buda
L D
LD
Ounadjela
K
K