SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Posters Magnetism IV

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.