Dmitry Sokolov: Metamagnetic textures in non-centrosymmetric antiferromagnets
Venue: lecture room F2, first floor, Ke Karlovu 5
We have a pleasure to invite you to attend the joint seminar
of the Department of Condensed Matter Physics (DCMP)
and the Materials Growth and Measurement Laboratory (MGML) http://mgml.eu.
Metamagnetic textures in non-centrosymmetric antiferromagnets
lecture given by:
The seminar takes place in the lecture room F2
of the Faculty of Mathematics and Physics, Ke Karlovu 5, Praha 2
on Wednesday, 6.11. 2019 from 14:10
On behalf of the DCMP and MGML
Spin-orbit coupling drives an array of phenomena in condensed matter physics ranging from Rashba surface states to the magnetic skyrmion in certain non-centrosymmetric compounds . The latter attracted a considerable interest in the recent years due to their magnetic vortex-like nature, but also due to potential applications in spintronics . So far the majority of magnetic skyrmions were observed in restricted regions of magnetic field-temperature phase diagram of chiral ferromagnets, in which strong spin-orbit coupling twists
the ferromagnetic order parameter into a long wavelength spiral. I will present a case of non-centrosymmetric antiferromagnet Ca3Ru2O7, in which the Lifshitz invariants, as expression of the spin-orbit coupling-driven antisymmetric magnetic exchange, couple the antiferromagnetic order parameter to the applied magnetic field and stabilise the 1-dimensional spin spiral. Via neutron diffraction and small-angle neutron scattering measurements I have recently showed that Ca3Ru2O7 spatially oscillates between ferro- and antiferromagnetic configurations resulting in a so-called metamagnetic textured state . The textured state also shows a strong anomalous Hall effect component indicating a topological nature of these spin-configurations. I will also suggest materials, in which Lifshitz invariants may couple many magnetic modes, which leads to materials hosting lumps of magnetic order, which can condense without conventional long-range order into disordered phases of magnetic skyrmions or other spin textures, or can form classical chiral spin liquids.
 A. Soumyanarayanan, N. Reyren, A. Fert, and C. Panagopoulos, Nature 539, 509 (2016).
 T. Jungwirth, J. Sinova, A. Manchon, X. Marti, J. Wunderlich and C. Felser, Nat. Phys. 14, 200 (2018).
 D. A. Sokolov et al., Nat. Phys. 15, 671 (2019).
 N. Nagaosa, J. Sinova, S. Onoda, A. H. MacDonald, and N. P. Ong, Rev. Mod. Phys. 82, 1539 (2010).
- Wednesday, 06 November 2019 14:10 - 15:10