Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport

MA 52.16: Poster

Friday, March 30, 2012, 11:00–14:00, Poster A

Theoretical and experimental investigation of ultrathin iron fcc films — •Michael Vogel, Matthias Kronseder, Florian Freund, Georg Woltersdorf, and Christian Back — Universität Regensburg

The magnetic properties of ultrathin films are determined in essence by the magnetic anisotropy constant, magnetic moment and the exchange interaction integral. Due to the challenging experimental accessibility of these parameters and the fact that none of these parameters can be obtained separately, the combination of experimental and theoretical methods can be used [1]. Optical (MOKE) and photoemission (MCD) measurements combined with ab initio calculations (DFT-VASP) [2] leads to a full understanding of the magnetic behavior of this system. For the theoretical investigation of the interatomic exchange interactions and the magnetic moment we have modeled those as a function of the involved strain in thin films. Assuming a ferromagnetic state of thin films as demonstrated experimentally in [3], we have calculated the exchange interaction from first principles by rotating moments within specially constructed supercells, based on structural data achieved by I(V)-LEED measurements also done in [3]. In addition the exchange interactions have also been determined using a ''spin-spiral'' technique [4].

[1] H. L. Meyerheim et al., PRL 103, 267202 (2009) [2] G. Kresse et al., Comp. Mater. Sci. 6, 15 (1996). [3] S. Müller et al., Phys. Rev. Lett. 74, 765 (1995). [4] L.M. Sandratskii, J. Phys. Condens. Matter 3, 8565 (1993); J. Phys. Condens. Matter 3, 8587 (1993).