SKM 2021 – wissenschaftliches Programm
MA 15.41: Poster
Donnerstag, 30. September 2021, 13:30–16:30, P
Antiferromagnetic spin cycloids imaged with a Scanning Nitrogen-Vacancy Magnetometer — Hai Zhong1, Johanna Fischer2, Aurore Finco3, Vincent Jacques3, Vincent Garcia2, and •Peter Rickhaus1 — 1Qnami AG, Switzerland — 2Unité Mixte de Physique, CNRS, Thales, Université Paris Saclay, France — 3Laboratoire Charles Coulomb, CNRS, Université de Montpellier, France
Multiferroics, such as BiFeO3, in which antiferromagnetism and ferroelectricity coexist at room temperature, appear as a unique platform for spintronic and magnonic devices. The nanoscale structure of its ferroelectric domains has been widely investigated with piezoresponse force microscopy (PFM). However, the BiFeO3 nanoscale magnetic textures and their potential for spin-based technology remain concealed. We present two different antiferromagnetic spin textures in BiFeO3 thin films with different epitaxial strains, using a commercial scanning Nitrogen-Vacancy magnetometer (SNVM) based on a single NV defect in diamond. Two BiFeO3 samples were grown on DyScO3 (110) and SmScO3 (110) substrates. The striped ferroelectric domains in both samples are first observed by the in-plane PFM, and SNVM confirms the existence of the spin cycloid texture. At the local scale, the combination of PFM and SNVM allows to identify the relative orientation of the ferroelectric polarization and cycloid propagation directions on both sides of a domain wall. Our results show the potential for reconfigurable nanoscale spin textures on multiferroic systems by strain engineering.