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: Z54.00012 : Antiferromagnetic coupling of anti-phase domains*
1:42 PM–1:54 PM
Presenter:
Ulrike Zweck
(Research Neutron Source Heinz Maier-Leibnitz (FRM II))
Author:
Ulrike Zweck
(Research Neutron Source Heinz Maier-Leibnitz (FRM II))
Collaboration:
Michael Leitner
In these systems the magnetic moments are mainly carried by the Mn atoms, which interact ferromagnetically in the L21-ordered state and antiferromagnetically for neighbouring Mn spins. Using TEM and Lorentz TEM a reversal of magnetization at structural anti-phase domain boundaries (APBs) has been observed in Ni2MnAl0.5Ga0.5 implying that structural and magnetic domains are identical [2]. To clarify the reason of this relation and to study the mechanism of coupling of ferromagnetic domains across APBs, we investigated Ni2MnAl and Ni2MnAl0.5Ga0.5 powder samples in distinct ordering states via magnetic small-angle neutron scattering, giving access to the magnetization microstructure. With an external magnetic field applied we observe a redistribution of intensity along the field direction, implying that the domains couple antiferromagnetically.
[1] P. Neibecker et al., Appl. Phys. Lett. 105, 261904 (2014)
[2] H. Ishikawa, Acta Mater. 56, 4789 (2008)
*Financial support by the Deutsche Forschungsgemeinschaft (project number 107745057, TRR 80) is gratefully acknowledged.
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