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MA: Fachverband Magnetismus

MA 38: Multiferroics I (DF with MA)

MA 38.1: Vortrag

Donnerstag, 10. März 2016, 09:30–09:50, H25

Room-temperature electric-field-induced magnetic anisotropy rotation in multiferroic heterostructures — •Gabriele De Luca, Peggy Schönherr, Manfred Fiebig, and Morgan Trassin — ETH Zürich, Department of Materials

The possibility to control magnetic anisotropy by using only an electric field has rendered compounds with interacting ferromagnetic and ferroelectric order a prime target of materials research. However, both orders hardly coexist at room-temperature in a single material phase, thus efforts focused on artificial heterostructures and magnetoelectric coupling as a composite effect. Here we design a multiferroic heterostructure Pt/CoFe/BiFeO3 (BFO) and we use a combination of magnetic force microscopy (MFM) and second harmonic generation (SHG) to detect the distribution of the ferromagnetic domains in CoFe and the buried ferroelectric domain state in BFO. With SHG we establish a unique relation between the BFO domains distribution and the nonlinear response and we perform the read-out without invading the system [1]. MFM reveals the one-to-one coupling of the ferroelectric/ferromagnetic domains. With an external electric field, we induce changes in the BFO ferroelectric state and we use magnetic field dependent MFM to probe the resulting effect on the CoFe domains and magnetic anisotropy. Previous work has unveiled in such systems that the net CoFe magnetization can be electrically reversed. Here we show that local magnetic anisotropy rotation can be achieved and correlated with the underlying ferroelectric domain state after voltage application. [1] M. Trassin, G. De Luca et al., Adv. Mater. 27, 4871 (2015)