Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 81: [MA] Surface magnetism IV

O 81.3: Vortrag

Donnerstag, 17. März 2011, 15:45–16:00, HSZ 103

Search for homochiral magnetic structures along the step edge of Pt(664) — •Benedikt Schweflinghaus, Bernd Zimmermann, Gustav Bihlmayer, and Stefan Blügel — Peter Grünberg Institut (PGI-1) & Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Co chains at the step edge of Pt(997) is historically the prime example of a one-dimensional metallic magnet. A series of experimental and theoretical studies uncovered and explained the magnetic properties of this novel magnet. We re-investigate this type of system in the light of the recently discovered Dzyaloshinskii-Moriya interaction (DMI) of ultrathin films causing spin-orbit driven homochiral magnetic structures. The question arises whether the DMI in the Co chain at the Pt edge is strong enough to drive a spin-spiral state of one handedness.

In this contribution we investigate this point applying the material specific density functional theory by means of the Full-Potential Linearized Augmented Plane-Wave (FLAPW) method as implemented in the FLEUR code [1] to a variety of transition-metal (TM) chains on Pt(664). We compare TM chains to the previous analysis of the magnetic anisotropy energy (MAE) for Co chains on Pt(664) [2]. Via a micromagnetic model that includes the MAE, as well as the spin stiffness and the Dzyaloshinskii vector we investigate the possible magnetic phases. While in the Co chain it appears that the ground state is collinear, yet in other TM chains non-collinear states may be possible.

[1] http://www.flapw.de

[2] S. Baud et al., Physical Review B 73, 104427 (2006)