Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.4: Poster

Freitag, 18. März 2011, 11:00–14:00, P2

Spin-structure of the Mn double layer on W(110) — •Silke Schröder, Paolo Ferriani, and Stefan Heinze — Institute of Theoretical Physics and Astrophysics, CAU Kiel, Germany

In ultrathin magnetic films Heisenberg exchange, Dzyaloshinskii-Moriya interaction (DMI) and magnetic anisotropy can compete and thus span a vast magnetic phase space containing also two- and three-dimensional complex magnetic structures [1]. Recent spin-polarized scanning tunneling microscopy measurements of the double layer of Mn on W(110) [2] suggest a short period ferromagnetic spin-spiral propagating along the [001] direction for an out-of-plane tip magnetization. However, an antiferromagnetic (AFM) contrast along the [1-10] direction is found for an in-plane tip magnetization which hints at a complex spin-structure. We studied the magnetic properties of this system by means of density functional theory calculation using the full-potential linearized augmented plane wave (FLAPW) method. We found a strong AFM nearest neighbour exchange and performed spin-spiral calculations resulting in a non-collinear ground state. Including spin-orbit coupling (SOC) in our calculations we determined the preferred magnetization direction due to magnetocrystalline anisotropy and studied the effects of the DMI. We finally considered three-dimensional spin-structures as possible explanations for the experimental results.

[1] Heide et al.: www.psi-k.org/newsletters/News_78/

    Highlight_78.pdf (2006)

[2] Y. Yoshida, K. von Bergmann, private communication