Lattice strain induces altermagnetic spin texture in ultrathin ruthenium dioxide
Researchers at Rice University, together with the University of Minnesota and Switzerland’s Paul Scherrer Institute, working with contributing researchers from the Gwangju Institute of Science and Technology, Kyung Hee University, and Myongji University in South Korea, the University of Illinois Urbana-Champaign, the University of West Bohemia in the Czech Republic, and beamline scientists at Lawrence Berkeley National Laboratory’s Advanced Light Source and Brookhaven National Laboratory’s National Synchrotron Light Source II, have found that ultrathin, epitaxially strained films of ruthenium dioxide (RuO2) display a spin texture consistent with altermagnetism, a form of magnetic order the material’s bulk and thick-film forms have consistently failed to show despite RuO2 standing for years as one of altermagnetism’s leading candidate materials.
Illustration of strain-induced emergent magnetism in ultrathin RuO2/TiO2. Possible theoretic altermagnetic spin density is rendered with orange and blue visual effects in the top RuO2 layers using AI. Credit: Rice University/Yichen Zhang.
Using spin-resolved angle-resolved photoemission spectroscopy (ARPES) on a 2.7-nanometer-thick, substrate-strained RuO2 film, the team observed a spin texture combining mirror-odd and mirror-even components that a comprehensive symmetry analysis rules out explaining through nonmagnetic effects, pointing instead to intrinsically broken time-reversal symmetry.
Source: https://www.spintronics-info.com/lattice-strain-induces-altermagnetic-spin-texture-ultrathin-ruthenium-dioxide
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