Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 4: Spin structures and magnetic phase transitions

MA 4.10: Vortrag

Montag, 12. März 2018, 12:00–12:15, EB 202

Symmetry and Spin Reorientation in Low-Dimensional Antiferromagnet SeCuO₃ — •Mirta Herak¹, Nikolina Novosel¹, William Lafargue-dit-Hauret², Xavier Rocquefelte², Željko Rapljenović¹, Martina Dragičević¹, and Helmuth Berger³ — ¹Institute of Physics, Bijenička c. 46, HR-10000 Zagreb, Croatia — ²Institut des Sciences Chimiques de Rennes UMR 6226, Université de Rennes 1, 35042 Rennes Cedex, France — ³École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland

We study the antiferomagnetic ground state of low-dimensional SeCuO₃ by combining torque magnetometry with simple phenomenological approach to magnetic anisotropy and Density Functional Theory (DFT) calculations. Combining measured torque data with phenomenological approach allows us to choose between several symmetry allowed shapes of magnetic anisotropy energy (MAE) and to determine spin orientation in zero and finite magnetic field. Results obtained in magnetic fields larger than spin-flop field indicate that spin reorientation is more complicated than usual spin flop found in collinear antiferromagnet. The microscopic origin of MAE in SeCuO₃ was also investigated theoretically, based on DFT+U calculations including spin-orbit coupling on an antiferromagnetic model. It was evidenced inequivalent copper sites impact differently the magnetic anisotropy of this system, leading to a change of the easy magnetization axis. This work is fully supported by the HrZZ grant UIP-2014-09-9775 and by the COGITO project "Theoretical and experimental study of magnetic and multiferroic materials".