Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 57: Focused Session: Spin-Orbit Interaction at Surfafces: From the Rashba Effect to Topological States of Matter II

O 57.12: Vortrag

Donnerstag, 26. März 2009, 18:45–19:00, HSZ 02

Non-collinear magnetism in two-dimentional FePt systems — •Svitlana Polesya, Sven Bornemann, Sergiy Mankovsky, Jan Minar, and Hubert Ebert — Ludwig-Maximilians-Universität München, Department Chemie und Biochemie/Physikalische Chemie, München, Deutschland

The temperature dependent magnetism of a FePt monolayer and of a FePt two-dimentional (2D) alloy cluster on a Pt(111) substrate were investigated by means of Monte Carlo simulations. The calculations were based on the extended Heisenberg model accounting for isotropic exchange as well as the anisotropic Dzyaloshinski-Moriya (DM) exchange interaction. The DM coupling was found to be responsible for a non-collinear spin configuration in both alloy systems at low temperature. The Fe-Pt exchange turned out to play an important role stabilising the ferromagnetic order and appreciably influencing the critical temperature. For this reason a corresponding term in the model Hamiltonian was included describing the induced Pt magnetic moment as a function of the average magnetic moments of the surrounding Fe atoms. The role of the magnetic anisotropy on magnetic order in the 2D alloy systems was also investigated in detail.