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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

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

KFM 8.5: Vortrag

Mittwoch, 18. März 2020, 10:30–10:45, HSZ 401

Quantifying multiferroic domain population by nuclear magnetic resonance spectroscopy — •Thomas Gimpel¹, Markus Prinz-Zwick¹, Caroline Steinbrecht¹, Norbert Büttgen¹, Vladimir Tsurkan^1,2, and István Kézsmárki¹ — ¹Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86135 Augsburg, Germany — ²Institute of Applied Physics, Academy of Sciences of Moldova, Academiei strada 5, Chisinau, Republic of Moldova

We demonstrate that nuclear magnetic resonance spectroscopy can be used to measure the volume fraction of multiferroic domains. This new technique is applicable to anisotropic magnets where the different multiferroic domains are characterized either by different orientations of the magnetization or by different forms of the hyperfine coupling or the quadrupole interactions. The latter case is realized, e.g., in type-I mutliferroics where the ferroelectric domains have non-collinear polar axes. We carried out a proof-of-concept study on GaV4Se8 which has recently gained interest due to its multiferroic behavior and for hosting Néel-type magnetic skyrmions. This material becomes ferroelectric below 42 K - where four polar domains with polar axes along the cubic <111>-type axes emerge - and orders magnetically below 18 K. Its multiferroic domain population can be controlled either by magnetic or by electric fields. By our new method we can directly quantify the volume fraction of each of the four domains.