Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 38: MagneticThin Films I
MA 38.2: Vortrag
Donnerstag, 29. März 2012, 09:45–10:00, H 0112
Temperature driven oscillatory magnetic anisotropy in ultrathin ferromagnetic films — Maciej Dabrowski1, •Marek Przybylski1, Marek Cinal2, and Jürgen Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany — 2Institute of Physical Chemistry of the Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
In ultrathin ferromagnetic films, quantum well states (QWS) are expected to contribute to the magnetic anisotropy energy (MAE) when the spread of the Fermi function (∼4·kBT) is much smaller than the energy difference between the two states of each QWS pair contributing to the MAE. The magnetic anisotropy should therefore exhibit a strong temperature dependence for film thicknesses for which the pairs of QWS contribute to the MAE (d=d0+n·L). The result is an oscillatory magnetic anisotropy at low temperatures only. The oscillation period L is determined by the wave vector of the bulk d-band corresponding to the QWS crossing Fermi level, and thus allows to identify the electronic states which contribute to the MAE.
Such temperature effects on the MAE is shown and discussed for fcc-Co films on vicinal surfaces of Cu(001) and for bcc-Fe films on vicinal surfaces of Au(001).