Berlin 2015 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 21: Multiferroics I (joint session with DF)
DS 21.5: Vortrag
Mittwoch, 18. März 2015, 10:30–10:45, EB 107
Polarization control at spin-driven ferroelectric domain walls — •Naëmi Leo1, Anders Bergmann2, Andres Cano3, Narayan Poudel4, Bernd Lorenz4, Manfred Fiebig1, and Dennis Meier1 — 1ETH Zurich, Switzerland — 2Uppsala University, Sweden — 3University Bordeaux, France — 4University of Houston, USA
As was recently demonstrated, domain walls in ferroelectric materials show emergent electronic properties, like enhanced conductivity tunable by the relative orientation of the polarisation in the adjacent domains. Here, multiferroic materials with a coexistence of magnetic and electric order offer a new route for the control of such localised functionalities at domain boundaries.
Using spatially-resolved optical second harmonic generation we demonstrate the magneto-electric-field control of the multiferroic domains in Co-doped MnWO4. In particular, the obtained domain distribution remains unchanged upon the magnetic-field-induced continuous 90∘-rotation of the ferroelectric polarization.
This stability implies that multiferroic domain walls can accommodate for varying local polarisation configurations leading to local charging and discharging. We discuss the microscopic structure of the domain walls using micro-magnetic simulations.