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KR: Fachgruppe Kristallographie

KR 3: Poster Session on Ferroic Domain Walls - Multiferroics (DF jointly with KR, MA, TT)

KR 3.28: Poster

Montag, 16. März 2015, 19:00–21:00, Poster C

Magnetoelectric domain control in multiferroic TbMnO₃ — •Sebastian Manz¹, Masakazu Matsubara^1,2, Masahito Mochizuki^3,4, Teresa Kubacka¹, Ayato Iyama⁵, Nadir Aliouane⁶, Tsuyoshi Kimura⁵, Steven Johnson¹, Dennis Meier¹, and Manfred Fiebig¹ — ¹ETH Zürich — ²Tohoku University — ³Aoyama Gakuin University — ⁴Japan Science and Technology Agency — ⁵Osaka University — ⁶Paul Scherrer Institute

Spin-spiral multiferroics exhibit a strong coupling between the electric and magnetic subsystems which is of potential interest for technological applications. Although these systems have been investigated for more than a decade, the magnetoelectric domain evolution under external fields is still largely unknown. Using optical second harmonic generation we resolve how electric and magnetic fields affect the multiferroic domains in the archetypal spin-spiral multiferroic TbMnO₃. In consecutive electric switching cycles, varying multi-domain patterns emerge before a single-domain state is obtained. This observation reflects that the domain walls can easily move without being pinned by, e.g., structural defects. In striking contrast to the electric-field response, multi-domain patterns persist when the polarization direction is flopped by applied magnetic fields. Here, a uniform polarization rotation is observed within all domains, which incorporates a transformation of neutral into nominally charged domain walls. Our results are explained based on numerical Landau-Lifshitz-Gilbert simulations and provide first evidence for the scalability of macroscopic magnetoelectric properties onto the level of domains.