Perpendicular anisotropy in Pd/Co multilayers

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  • H. J. G. Draaisma
    Department of Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
  • F. J. A. den Broeder
    Philips Research Laboratories, 5600 JA Eindhoven, The Netherlands
  • W. J. M. de Jonge
    Department of Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands

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<jats:p>The anisotropy values in polycrystalline Pd/Co multilayers with [111] texture as determined from magnetization measurements, torque measurements, and ferromagnetic resonance are compared. It is concluded that the most reliable value is obtained from the area between the magnetization curves measured with the field parallel and perpendicular to the plane of the film. The anisotropy is made up of a volume and an interface contribution. In a pair interaction model for the interface anisotropy it is shown that the latter is very sensitive to the precise distribution of Co and Pd at the interfaces. From the experimental data we derive a lower bound value of 0.2 meV per Co atom for the energy change with the direction of the magnetic moment. The temperature dependence of the magnetization indicates a long-range interaction across the Pd layers up to 15–25 Å.</jats:p>

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