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MA: Fachverband Magnetismus
MA 14: Surface Magnetism
MA 14.2: Talk
Tuesday, March 28, 2023, 10:00–10:15, HSZ 04
Structure–Property Relationship of Reversible Magnetic Chirality Tuning — •Jing Qi1, Paula M. Weber1, Tilman Kisslinger2, Lutz Hammer2, M. Alexander Schneider2, and Matthias Bode1 — 1Julius-Maximilians-Universitaet Wuerzburg, Germany — 2Universitaet Erlangen-Nuernberg, Germany
The Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction mediates collinear magnetic interactions
via the conduction electrons of a non-magnetic spacer, resulting in a ferro- or antiferromagnetic
magnetization in magnetic multilayers [1]. Recently it has been discovered that heavy non-magnetic
spacers are able to mediate an indirect magnetic coupling that is non-collinear and chiral.
This Dzyaloshinskii-Moriya-enhanced RKKY (DME-RKKY) interaction causes the emergence
of a variety of interesting magnetic structures, such as skyrmions and spin spirals [2]. Here, we show
by spin-polarized STM that the interchain coupling between manganese oxide chains on Ir(001)
can reproducibly be switched from chiral to collinear antiferromagnetic by increasing the oxidation
state of MnO2 while the reverse process can be induced by thermal reduction. The underlying
structure–property relationship is revealed by low-energy electron diffraction intensity (LEED-IV)
analysis. Density functional theory calculations suggest that the magnetic transition may be caused
by a significant increase of the Heisenberg exchange which overrides the DMI interaction upon oxidation.
[1] P. Bruno et al., Phys. Rev. Lett. 67, 1602-1605 (1991).
[2] M. Schmitt et al., Nat. Commun. 10, 2610 (2019).