Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 42: Thin films – anisotropy
MA 42.1: Talk
Thursday, March 15, 2018, 09:30–09:45, EB 301
Magnetic properties of Co/Pt multilayers and their dependence on Co thickness — •Lorenzo Fallarino1, Karine Chesnel2, Benny Böhm3, Fabian Samad3, and Olav Hellwig1,3 — 1Institute of Ion Beam Physics and Materials Research, HZDR — 2Department of Physics and Astronomy, BYU, USA — 3Institute of Physics, TU Chemnitz
Ferromagnetic (FM) / non-magnetic multilayers with perpendicular magnetic anisotropy (PMA) provide an efficient route for controlling magnetism. They constitute an interesting model system with easily tunable magnetic properties by changing the individual layer thicknesses or number of repetitions1. During the past years, an extensive work effort has led to an apparently complete understanding of those structures. The majority of these studies utilized very thin FM layers, since an in-plane reorientation of the magnetization is expected for thicker films. However, for sufficiently thick FM layers, the system undergoes a second transition back to out-of-plane direction2. Consequently, we present a thickness dependent study of magnetic properties of [Co/Pt]50 multilayers that maintain their PMA through all Co thicknesses. By studying in more detail the influence of the magnetic history on the remanent domain pattern3, we find an optimal Co thickness for that instead of the typical maze-like inter-connected domains a bubble lattice is stabilized with extraordinary high domain density4. [1] M. T. Johnson et al. Rep. Prog. Phys. 59, 1409 (1996). [2] L. Fallarino et al. PRB 94, 064408 (2016). [3] Westover et al. JMMM 399, 164 (2016). [4] K. Chesnel et al. submitted to PRB (25/08/2017).