Berlin 2015 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 4: Focused Session on Ferroic Domain Walls I (DF with MA)
DF 4.5: Topical Talk
Montag, 16. März 2015, 16:50–17:20, EB 107
Spintronic functionality of BiFeO3 domain walls — Ji Hye Lee1,3, Ignasi Fina1,2, Dietrich Hesse1, and •Marin Alexe1,2 — 1Max Planck Institute of Microstructure Physics, 06120 Halle, Germany — 2University of Warwick, Department of Physics, Coventry CV4 7AL, UK — 3Division of Quantum Phase and Device, Department of Physics, Konkuk University, Seoul 143-701, Korea
Here we show that the FE domain walls (DWs) in the multiferroic material BiFeO3 (BFO), which are intrinsically two dimensional nano-objects, are not only conductive, but are also ferromagnetic, showing spin-dependent transport. We will show that the electronic transport across the * FM and FE * domain walls in BFO is modulated by an external magnetic field, resembling the anisotropic magnetoresistance (AMR) in archetypical metallic ferromagnets. The found AMR is accompanied by a visible hysteresis, which is ascribed to the coupling of the FM domain walls to the antiferromagnetic properties of the BFO domains, similar to those found in magnetically coupled FM/AFM structures. Since BFO preserves two switchable electric polarization states, one can manipulate the FE DWs and thus magnetization via an electric field. The electronic transport occurring through the FE DWs in common metal-ferroelectric-metal capacitors has been discriminated from the contribution occurring from the bulk, and the intrinsic conduction mechanism at the DWs is identified.