title: Flux closure structures in cobalt rings.
abstract: 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.
authors.affiliation: Laboratoire de Microstructures et de Microélectronique (CNRS), 196 Avenue H. Ravera, 92225 Bagneux Cedex, France.
authors.forename: S P
authors.initials: SP
authors.lastname: Li
authors.forename: D
authors.initials: D
authors.lastname: Peyrade
authors.forename: M
authors.initials: M
authors.lastname: Natali
authors.forename: A
authors.initials: A
authors.lastname: Lebib
authors.forename: Y
authors.initials: Y
authors.lastname: Chen
authors.forename: U
authors.initials: U
authors.lastname: Ebels
authors.forename: L D
authors.initials: LD
authors.lastname: Buda
authors.forename: K
authors.initials: K
authors.lastname: Ounadjela