Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Z54: Magnetic Domains and Domain Walls
11:30 AM–2:30 PM,
Friday, March 18, 2022
Room: McCormick Place W-476
Sponsoring
Unit:
GMAG
Chair: Krzysztof Gofryk, Idaho National Labs
Abstract: Z54.00007 : Formation of Domains and magnetic Reversal in the canted Antiferromagnet α-Fe2O3*
12:42 PM–12:54 PM
Presenter:
Angela Wittmann
(Massachusetts Institute of Technology MIT, Johannes Gutenberg University Mainz)
Authors:
Angela Wittmann
(Massachusetts Institute of Technology MIT, Johannes Gutenberg University Mainz)
Kai Litzius
(Massachusetts Institute of Technology MIT)
Alexandra Churikova
(Massachusetts Institute of Technology MIT)
Larry Scipioni
(PVD Products)
Adam Shepard
(PVD Products)
Ty Newhouse-Illige
(PVD Products)
James Greer
(PVD Products)
Norman O Birge
(Michigan State University)
Geoffrey S Beach
(Massachusetts Institute of Technology MIT)
The domain structure forms a multi-domain state at zero field and depends strongly on the magnetic field. Combining angle-dependent SMR and XMLD measurements, we can find, that the internal destressing fields driving the formation of domains do not follow the hexagonal crystal symmetry of α-Fe2O3. Furthermore, the canting induces a weak ferromagnetic moment which lifts the degeneracy of the sublattices and consequently the orientation of the Néel vector with respect to the field resulting in hysteresis. The irreversibility upon switching the polarity of the field elucidates the formation of antiferromagnetic as well as ferromagnetic domain walls at low magnetic fields. These insights serve as a foundation for further studies of electrical and optical manipulation of the domain structure of canted antiferromagnets.
*SMART by NIST, DARPA TEE program, Swiss National Science Foundation, synchrotron radiation beamtime at Helmholtz Zentrum Berlin
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