Journal Article

FZJ-2019-03383

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Indirect chiral magnetic exchange through Dzyaloshinskii–Moriya-enhanced RKKY interactions in manganese oxide chains on Ir(100)

Schmitt, M. (Corresponding author) ; Moras, P. ; Bihlmayer, G.FZJ* ; Cotsakis, R. ; Vogt, M. ; Kemmer, J. ; Belabbes, A. ; Sheverdyaeva, P. M. ; Kundu, A. K. ; Carbone, C. ; Blügel, S.FZJ* ; Bode, M.

2019
Nature Publishing Group UK [London]

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Please use a persistent id in citations: http://hdl.handle.net/2128/22355  doi:10.1038/s41467-019-10515-3

Abstract: Localized electron spins can couple magnetically via the Ruderman–Kittel–Kasuya–Yosida interaction even if their wave functions lack direct overlap. Theory predicts that spin–orbit scattering leads to a Dzyaloshinskii–Moriya type enhancement of this indirect exchange interaction, giving rise to chiral exchange terms. Here we present a combined spin-polarized scanning tunneling microscopy, angle-resolved photoemission, and density functional theory study of MnO2 chains on Ir(100). Whereas we find antiferromagnetic Mn–Mn coupling along the chain, the inter-chain coupling across the non-magnetic Ir substrate turns out to be chiral with a 120° rotation between adjacent MnO2 chains. Calculations reveal that the Dzyaloshinskii–Moriya interaction results in spin spirals with a periodicity in agreement with experiment. Our findings confirm the existence of indirect chiral magnetic exchange, potentially giving rise to exotic phenomena, such as chiral spin-liquid states in spin ice systems or the emergence of new quasiparticles.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IAS-1)
2. Quanten-Theorie der Materialien (PGI-1)
3. JARA-FIT (JARA-FIT)
4. JARA - HPC (JARA-HPC)

Research Program(s):

1. 142 - Controlling Spin-Based Phenomena (POF3-142) (POF3-142)
2. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)

Appears in the scientific report 2019

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