New paper of the group

Enhanced in-plane magnetic anisotropy in thermally treated arrays of Co-Pt nanowires

Fernando Meneses, Cristina Bran, Manuel Vázquez and Paula G. Bercoff

Materials Science and Engineering B 261 (2020) 114669

DOI: doi.org/10.1016/j.mseb.2020.114669

Ordered arrays of CoxPt100-x cylindrical nanowires (NWs) with x = 90, 80, 70 were synthesized by template-assisted electrodeposition using nanoporous alumina membranes of 55 nm pore diameter. The obtained NWs alloys crystallize in hcp and/or fcc structures, depending on the composition and thermal treatment, resulting in different magnetic behaviors. The magnetic anisotropy was studied as a function of composition and crystalline structure in as-deposited and annealed samples. An enhanced coercivity was obtained for the Co70Pt30 NWs array, in which in-plane anisotropy (e.g., perpendicular to the NWs axis) was found. These characteristics have not been reported for NWs of this kind. A simplified model of effective anisotropy including shape, magnetostatic interaction and magnetocrystalline contributions is presented, which appropriately describes the magnetic behavior of the CoxPt100-x NWs arrays before and after annealing.

This work has been performed in collaboration with the National University of Cordoba, Argentina within the framework of the i-COOP B 20037 project supported by CSIC.