Imaging Topological Defects in a Noncollinear Antiferromagnet.

Autor:	Finco A; Laboratoire Charles Coulomb, CNRS, Université de Montpellier, 34095 Montpellier, France., Haykal A; Laboratoire Charles Coulomb, CNRS, Université de Montpellier, 34095 Montpellier, France., Fusil S; Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France., Kumar P; Laboratoire Charles Coulomb, CNRS, Université de Montpellier, 34095 Montpellier, France., Dufour P; Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France., Forget A; SPEC, CEA, CNRS, Université Paris-Saclay, 91191 Gif sur Yvette, France., Colson D; SPEC, CEA, CNRS, Université Paris-Saclay, 91191 Gif sur Yvette, France., Chauleau JY; SPEC, CEA, CNRS, Université Paris-Saclay, 91191 Gif sur Yvette, France., Viret M; SPEC, CEA, CNRS, Université Paris-Saclay, 91191 Gif sur Yvette, France., Jaouen N; Synchrotron SOLEIL, 91192 Gif-sur-Yvette, France., Garcia V; Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France., Jacques V; Laboratoire Charles Coulomb, CNRS, Université de Montpellier, 34095 Montpellier, France.
Jazyk:	angličtina
Zdroj:	Physical review letters [Phys Rev Lett] 2022 May 06; Vol. 128 (18), pp. 187201.
DOI:	10.1103/PhysRevLett.128.187201
Abstrakt:	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.
Databáze:	MEDLINE
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