Magnetocrystalline anisotropy-dependent six-fold symmetric anisotropic magnetoresistance in epitaxial CoxFe3−xO4 films
Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University - Tianjin 300072, PRC
Received: 18 May 2012
Accepted: 9 October 2012
The angular-dependent anisotropic magnetoresistance (AMR) of epitaxial CoxFe3−xO4 films has been investigated systematically. The six-fold symmetric AMR was observed in the (111)-oriented epitaxial CoxFe3−xO4 films in contrast to the four-fold symmetric AMR of the (100)- and (110)-oriented CoxFe3−xO4 films. The six-fold term appears at temperatures below 200 K, and becomes more pronounced with increasing x, while no six-fold term was found in epitaxial NixFe3−xO4 films. The six-fold characteristics observed in the epitaxial CoxFe3−xO4 films are considered to be induced by the large magnetocrystalline anisotropy caused by Co addition, which directly proves that the AMR of magnetite is intimately related to magnetocrystalline anisotropy.
PACS: 75.47.−m – / 81.15.Cd – / 75.30.Gw –
© EPLA, 2012