Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 33: Multiferroics II (DF with DS/KR/MA/TT)
MA 33.13: Talk
Wednesday, March 18, 2015, 18:35–18:50, EB 107
Mechanism of interfacial magnetoelectric coupling in composite multiferroics — Chenglong Jia1, Tongli Wei1, Changjun Jiang1, Desheng Xue1, •Alexander Sukhov2, and Jamal Berakdar2 — 1Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou 730000, China — 2Institut für Physik, Martin-Luther-Universität, Halle-Wittenberg, 06099 Halle (Saale), Germany
We present a mechanism for the magnetoelectric coupling at ferroelectric/ferromagnetic interfaces based on screening via interfacial spin-rearrangement [1]. We find an electric-polarization-driven, non-collinear spin region extending over the spin-diffusion length in the ferromagnet. The orbital motion of the carriers in the ferromagnet is affected by the gauge field associated with the non-collinear spin order and hence indirectly by the electric polarization. Changing the latter, e.g., via an electric field influences the interfacial magnetic order and hence the spin-orbital coupled motion of the carriers. This allows for tuning the interfacial spin-dependent transport via electric fields. The resulting coupling is robust at room temperature and can be well approximated by a linear polarization- magnetization coupling, whose strength estimate for the composite Co(40 nm)/(tetragonal)BaTiO3 is in line with recent experiments [2].
[1] C.-L. Jia, T.-L. Wei, C.-J. Jiang, D.-S. Xue, A. Sukhov, J. Berakdar, Phys. Rev. B 90, 054423 (2014). [2] N. Jedrecy, H.J. von Bardeleben, V. Badjeck, D. Demaille, D. Stanescu, H. Magnan, A. Barbier, Phys. Rev. B 88, 121409(R) (2013).