Modifications of magnetic anisotropy and magnetization reversal in [Co0.4 nm/Pd0.7 nm]50 multilayers induced by 10 keV-He ion bombardment

Arno Ehresmann, Olav Hellwig, Oliver Buhl, Nicolas David Müglich, Tanja Weis, Dieter Engel
2012 Journal of Applied Physics  
Co 0.4 nm /Pd 0.7 nm ] 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
more » ... 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. V C 2012 American Institute of Physics. [http://dx.
doi:10.1063/1.4752274 fatcat:tkgtvwxn7ndf5o2rloprrnqqja