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Symmetry and Spin Reorientation in Low-Dimensional Antiferromagnet SeCuO3

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".

low-dimensional spin systems, spin reorientation, magnetic anisotropy

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