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MA: Fachverband Magnetismus

MA 49: POSTER II

MA 49.1: Poster

Donnerstag, 19. März 2015, 15:00–18:00, Poster A

Effects of the DM-interaction on thermodynamic properties of molecular spin systems — •Christian Heesing and Jürgen Schnack — Universitätsstr. 25, 33739 Bielefeld

The magnetism of many magnetic molecules is dominated by isotropic Heisenberg exchange interactions. For 3d elements anisotropic contributions are usually small. Nevertheless, they can have drastic consequences at low temperatures as for instance on bistability and quantum tunnelling in the case of easy-axis anisotropies.
In this contribution we investigate the effect of the Dzyaloshinskii-Moriya (DM) interaction [1,2] on thermodynamic magnetic observables such as the low-temperature magnetization. The full Hamiltonian contains Heisenberg exchange, Zeeman term, and Dzyaloshinskii-Moriya interaction. Thermodynamic observables are systematically compared for various ratios of DM and Heisenberg interaction strength.
  [1] T. Moriya, Phys. Rev., 1960, 120, 90-98
  [2] I. Dzyaloshinskii, J. Phys. Chem. Solids, 1958, 4, 241-255