Regensburg 2022 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 29: Multiferroics and Magnetoelectric Coupling (joint session MA/KFM)
KFM 29.5: Vortrag
Donnerstag, 8. September 2022, 16:00–16:15, H47
Transfer of a domain pattern between ferroic orders — •Yannik Zemp1, Ehsan Hassanpour1, Yusuke Tokunaga2, Yasujiro Taguchi3, Yoshinori Tokura3, Thomas Lottermoser1, Manfred Fiebig1, and Mads C. Weber1,4 — 1Department of Materials, ETH Zurich — 2University of Tokyo — 3Riken CEMS, Japan — 4IMMM, Université Le Mans
In multiferroic materials with two ferroic orders, the order parameters and their respective domain patterns may be rigidly coupled or completely independent, with both of these cases having their merits. We show that in materials with three ferroic order parameters, unusual combinations of coupling and independence are possible. One such material is Dy0.7Tb0.3FeO3. Here, an antiferromagnetic order of the rare earth ions (L) and a ferromagnetic order of the iron ions (M) induce an electric polarisation (P) and a trilinear coupling term M · L · P contributes to the free energy. This coupling term dictates that a reversal of one order parameter needs to be compensated by the product of the other two order parameters to minimise the free energy. Using this fact, we show that a domain pattern in M can be transferred to P while erasing it in the original order parameter, and vice versa, by the application of magnetic and electric fields. We measure the P and M patterns independently by optical second harmonic generation imaging and Faraday rotation microscopy, respectively. The third order parameter L acts as the ”memory buffer” for the transfer. The presented work demonstrates the significance of exploration in multiferroics beyond a bilinear coupling.