Modifications of magnetic anisotropy and magnetization reversal in [Co-0.4nm/Pd-0.7nm](50) multilayers induced by 10 keV-He ion bombardment

作者：Ehresmann Arno^*; Hellwig Olav; Buhl Oliver; Mueglich Nicolas David; Weis Tanja; Engel Dieter

来源：Journal of Applied Physics, 2012, 112(6): 063901.

DOI：10.1063/1.4752274

[(CoPd0.7nm)-Pd-0.4nm/](50) multilayers with Pd film thicknesses in the first ferromagnetic maximum of interlayer exchange coupling display almost purely perpendicular-to-plane anisotropy and labyrinth stripe domain patterns in remanence. Their magnetization reversal is characterized by domain nucleation starting at a defined field H-N and domain wall movement in a defined magnetic field range. The modification of the magnetization reversal by 10 keV He ion bombardment due to the reduced magnetic anisotropy has been investigated by polar magneto-optical Kerr effect, by vibrating sample magnetometry, and by magnetic force microscopy at room temperature. It is shown that the ion bombardment creates and increases areas with ferromagnetic in-plane anisotropy and proportions of the sample showing superparamagnetism, the latter predominantly in the deeper layers.

• 出版日期2012-9-15