Dresden 2020 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Multiferroics and Magnetoelectric Coupling I (joint session MA/KFM)

MA 32.7: Vortrag

Mittwoch, 18. März 2020, 11:15–11:30, HSZ 401

In situ electric and magnetic control of conductive domain walls in multiferroic GaV4S8 — •Somnath Ghara, Korbinian Geirhos, Vladimir Tsurkan, Peter Lunkenheimer, and István Kézsmárki — Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, Augsburg, Germany

GaV4S8, the lacunar spinel compound, has recently attracted interests due to the presence of different modulated magnetic phases, including Néel-type skyrmions and multiferroic properties. This compound undergoes a transition to the polar rhombohedral (R3m) state at TJT = 45 K and a subsequent magnetic transition at TC = 13 K. In the present work, by polarization and magnetic susceptibility studies, we demonstrate that the population of the four polar domains, with polarization along the four cubic <111>-type directions, can be controlled in situ both by electric and magnetic fields. Most interestingly, the dc conductivity of the polar multi-domain state is 106 times higher than that of the mono-domain state, indicating the presence of conductive domain walls. Correspondingly, when tuning the domain wall density by magnetic fields, we could achieve a giant magnetoresistance as high as 108 %. Furthermore, the conductivity of the domain walls shows a strong non-linearity, in contrast to the bulk.

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