Indirect chiral magnetic exchange through Dzyaloshinskii–Moriya-enhanced RKKY interactions in manganese oxide chains on Ir(100)
Indirect chiral magnetic exchange through Dzyaloshinskii–Moriya-enhanced RKKY interactions in manganese oxide chains on Ir(100)
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DOI：
10.1038/s41467-019-10515-3
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发表时间：
2019-06
影响因子：
16.6
通讯作者：
M. Schmitt;P. Moras;G. Bihlmayer;Ryan Cotsakis;M. Vogt;J. Kemmer;A. Belabbes;P. Sheverdyaeva;A. Kundu;C. Carbone;S. Blügel;M. Bode
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文献类型：
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作者：
M. Schmitt;P. Moras;G. Bihlmayer;Ryan Cotsakis;M. Vogt;J. Kemmer;A. Belabbes;P. Sheverdyaeva;A. Kundu;C. Carbone;S. Blügel;M. Bode
局域电子自旋可以通过Ruderman-Kittel-Kasuya-Yosida相互作用进行磁耦合，即使它们的波函数没有直接重叠。理论预测，自旋-轨道散射导致这种间接交换相互作用的Dzyaloshinskiii-Moriya型增强，从而产生手性交换项。本文采用自旋极化扫描隧道显微镜、角分辨光电子能谱和密度泛函理论研究了Ir（100）上MnO 2链的结构。虽然我们发现反铁磁Mn-Mn耦合沿着的链，链间耦合的非磁性Ir基板原来是手性与相邻的MnO 2链之间的120°旋转。计算结果表明，Dzyaloshinskiii-Moriya相互作用导致自旋螺旋与实验一致的周期性。我们的研究结果证实了间接手性磁交换的存在，可能会引起奇异的现象，如旋冰系统中的手性自旋液体状态或新准粒子的出现。
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 MnO2chains 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 MnO2chains. 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.