Dresden 2020 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 8: Multiferroics and Magnetoelectric Coupling I (joint session MA/KFM)

KFM 8.7: Talk

Wednesday, March 18, 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 T_JT = 45 K and a subsequent magnetic transition at T_C = 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.