Imaging Topological Defects in a Noncollinear Antiferromagnet

We report on the formation of topological defects emerging from the cycloidal antiferromagnetic order at the surface of bulk BiFeO_{3} crystals. Combining reciprocal and real-space magnetic imaging techniques, we first observe, in a single ferroelectric domain, the coexistence of antiferromagnetic d...

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Bibliographic Details
Published in:Physical review letters 2022-05, Vol.128 (18), p.187201-187201, Article 187201
Main Authors: Finco, Aurore, Haykal, Angela, Fusil, Stéphane, Kumar, Pawan, Dufour, Pauline, Forget, Anne, Colson, Dorothée, Chauleau, Jean-Yves, Viret, Michel, Jaouen, Nicolas, Garcia, Vincent, Jacques, Vincent
Format: Article
Language:English
Subjects:
Condensed Matter
Materials Science
Physics
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Summary:We report on the formation of topological defects emerging from the cycloidal antiferromagnetic order at the surface of bulk BiFeO_{3} crystals. Combining reciprocal and real-space magnetic imaging techniques, we first observe, in a single ferroelectric domain, the coexistence of antiferromagnetic domains in which the antiferromagnetic cycloid propagates along different wave vectors. We then show that the direction of these wave vectors is not strictly locked to the preferred crystallographic axes as continuous rotations bridge different wave vectors. At the junctions between the magnetic domains, we observe topological line defects identical to those found in a broad variety of lamellar physical systems with rotational symmetries. Our work establishes the presence of these magnetic objects at room temperature in the multiferroic antiferromagnet BiFeO_{3}, offering new possibilities for their use in spintronics.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.128.187201