title: Exchange anisotropy in nanocasted Co3O4 nanowires.
abstract: Antiferromagnetic Co3O4 nanowires with an average diameter of about 8 nm have been synthesized by using the nanocasting route. The nanowires were characterized by powder X-ray diffraction, transmission electron microscopy, and a superconducting quantum interference device magnetometer. The magnetic measurements show a unidirectional exchange anisotropy accompanied by an enhancement of the field-cooled coercivity at low temperature. These effects suggest the presence of an exchange interaction between the antiferromagnetic core and the surface spins. A strong dependence of the exchange field on the magnitude of the cooling field and a training effect have been observed. The dependence of exchange bias field on temperature reveals the important role played by the antiferromagnetic core in the exchange coupling.
authors.affiliation: Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany. salabas@mpi-muelheim.mpg.de
authors.forename: Elena Lorena
authors.initials: EL
authors.lastname: Salabaş
authors.forename: Anja
authors.initials: A
authors.lastname: Rumplecker
authors.forename: Freddy
authors.initials: F
authors.lastname: Kleitz
authors.forename: Florin
authors.initials: F
authors.lastname: Radu
authors.forename: Ferdi
authors.initials: F
authors.lastname: Schüth