Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 34: Magnetization / Demagnetization Dynamics III

MA 34.11: Talk

Wednesday, March 28, 2012, 17:45–18:00, H 1012

Small damping constant for Ni/Co multilayers with perpendicular magnetic anisotropy — •Markus Härtinger¹, Christian H. Back¹, See-Hun Yang², Stuart S. P. Parkin², and Georg Woltersdorf¹ — ¹Department of Physics, Universität Regensburg, 93040 Regensburg, Germany — ²IBM Almaden, San Jose, U.S.A.

It is known, that perpendicular magnetic anisotropy exists in materials which consist of multilayers comprised of alternating ultrathin layers of Co separated by ultrathin layers especially of Pt, Pd or Ni. In these systems the perpendicular magnetic anisotropy field can be sufficiently large to overcome the shape anisotropy and induces a magnetic easy axis perpendicular to the multilayers.

We study the static and dynamic properties of magnetic multilayers composed of alternating ultrathin layers of Co and Ni. In particular, the evolution of perpendicular magnetic anisotropy and the Gilbert damping parameter is investigated as a function of thickness using ferromagnetic resonance. We find a rather small Gilbert damping constant α=0.014. In addition we recognize only a weak dependence of the magnetic properties of the number of multilayer repetitions.