Anomalous Antiferromagnetism in Metallic RuO$_2$ Determined by Resonant X-ray Scattering
Z. H. Zhu, J. Strempfer, R. R. Rao, J. Pelliciari, Y. Choi, T., Kawaguchi, H. You, J. F. Mitchell, Y. Shao-Horn, and R. Comin
TL;DR
This study reveals that RuO$_2$, a metallic ruthenium oxide, exhibits G-type antiferromagnetic order above 300 K, even in nanometer-thick films, suggesting its potential for antiferromagnetic spintronics applications.
Contribution
First demonstration of high-temperature antiferromagnetic order in metallic RuO$_2$ using resonant X-ray scattering, including in ultrathin films.
Findings
RuO$_2$ exhibits G-type antiferromagnetism above 300 K.
Magnetic order persists in nanometer-thick films.
Resonant X-ray scattering confirms spin-ordered ground state.
Abstract
We studied the magnetic ordering of thin films and bulk crystals of rutile RuO using resonant X-ray scattering across the Ru L absorption edge. Combining polarization analysis and azimuthal-angle dependence of the magnetic Bragg signal, we have established the presence of G-type antiferromagnetism in RuO with T 300 K. In addition to revealing a spin-ordered ground state in the simplest ruthenium oxide compound, the persistence of magnetic order even in nanometer-thick films lays the ground for potential applications of RuO in antiferromagnetic spintronics.
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