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MA: Fachverband Magnetismus
MA 5: Cooperative Phenomena and Phase Transitions (joint session MA/TT)
MA 5.14: Vortrag
Montag, 16. März 2020, 12:45–13:00, HSZ 401
Concept of geometrically controlling artificial magnetoelectric materials — •Oleksii M. Volkov1, Ulrich K. Rößler2, Jürgen Fassbender1, and Denys Makarov1 — 1Helmholtz-Zentrum-Dresden-Rossendorf, Dresden, Germany — 2Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e. V. (IFW Dresden), Dresden, Germany
Magnetoelectric materials combine coupled magnetic and electrical order parameters, that allowed to control magnetic states via electrical influence and vice versa [1]. This offers exciting prospectives for energy efficient memory, logic and sensor devices. Here, we propose a new approach to electric field controlled nanomagnets [2], where the manipulation of magnetic states is done geometrically via modification of mesoscale Dzyaloshinskii-Moriya interaction and curvature-induced anisotropy [3]. The concept refers to geometrically curved helimagnetic springs embedded in a piezoelectric matrix or sandwitched between two piezoelectric layers. The electric field induces tiny changes of geometrical parameters, that leads to the transition between homogeneous and periodic helimagnetic states. This results in the appearance of strong converse magnetoelectric effect (CME) 15 × 10−3 (A m−1)/(V m−1), which is five times higher than CME for best laminated magnetoelectric composites 2.9 × 10−3 (A m−1)/(V m−1).
[1] W. Eerenstein et al., Nature 442, 759 (2006).
[2] O. Volkov et al., J. Phys. D: Appl. Phys. 52, 345001 (2019).
[3] O. Volkov et al., Scientific Reports 8, 866 (2018).