Strain switches on altermagnetism in ultrathin ruthenium dioxide films, addressing a years-long debate
Researchers led by Rice University, the University of Minnesota, and the Paul Scherrer Institute – with additional collaborators at Kyung Hee University, the Gwangju Institute of Science and Technology (GIST), Lawrence Berkeley National Laboratory, Brookhaven National Laboratory, Myongji University, the University of West Bohemia, and the University of Illinois Urbana-Champaign – have found spin texture consistent with altermagnetism in ultrathin, epitaxially strained films of ruthenium dioxide (RuO2), a material whose magnetic status has been debated for years.
Altermagnetism is a recently proposed third class of collinear magnetic order, alongside ferromagnetism and antiferromagnetism, in which compensated magnetic sublattices are related by rotation rather than by translation. That symmetry produces momentum-dependent spin splitting in a material’s electronic structure even though it carries no net magnetization – a combination that could be useful for miniaturizing and improving RAM architecture in computers. RuO2 was one of the first materials proposed as an altermagnetic candidate, but a long line of studies on its bulk and strain-relaxed thick-film forms – using x-ray diffraction, neutron diffraction, muon spin rotation, infrared spectroscopy, quantum oscillations, torque magnetometry and other probes – had converged on the conclusion that RuO2 shows no magnetism at all, leaving the field in a persistent state of debate.
Source: https://www.spintronics-info.com/strain-switches-altermagnetism-ultrathin-ruthenium-dioxide-films-addressing
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