Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Surface and Interface Magnetism I (O jointly with MA)
O 51.8: Vortrag
Mittwoch, 2. April 2014, 12:15–12:30, WIL C107
Oscillatory orbital magnetic moment via d-band quantum well states in Fe(001) films — •Thiago R. F. Peixoto1, Maciej Dabrowski1, Mariusz Pazgan1, Aimo Winkelmann1, Takeshi Nakagawa2, Yasumasa Takagi2, Toshihiko Yokoyama2, Uwe Bauer1, Fikret Yildiz1, Francesco Bisio1,3, Marek Przybylski1,4, and Jürgen Kirschner1,5 — 1MPI of Microstructure Physics, Halle, Germany — 2Institute for Molecular Science, Okazaki, Japan — 3CNR-SPIN, Genova, Italy — 4Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Krakow, Poland — 5Naturwissenschaftliche Fakultät II, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
Iron films grown on silver surfaces have shown an intriguing thickness-dependent oscillatory magnetic anisotropy [1,2]. We explored the effect of electron confinement on the magnetocrystalline anisotropy of bcc Fe films via a combination of spin-resolved photoemission spectroscopy (hν=6 eV), x-ray magnetic circular dichroism, and magneto-optical Kerr effect measurements. The thickness-dependent variations in the magnetocrystalline anisotropy are ascribed to periodic changes in the density of states at the Fermi level, induced by confinement of electronic states derived from majority dxz, dyz out-of-plane orbitals. Our results confirm a direct correlation between QWS, the orbital magnetic moment and the magnetocrystalline anisotropy.
[1] U. Bauer and M. Przybylski, Phys. Rev. B 81, 134428 (2010).
[2] J. Li et al., IEEE Trans. on Magn. 47, 1603 (2011).