Kavli Affiliate: Long Zhang
| First 5 Authors: Xiao-Tian Zhang, Xu-Ping Yao, Yuya Ominato, Long Zhang, Mamoru Matsuo
| Summary:
Spin pumping effect is a sensitive and well-established experimental method
in two-dimensional (2D) magnetic materials. We propose that spin pumping effect
can be a valuable probe for non-Fermi liquid (NFL) behaviors at the 2D
interface of magnetic heterostructures. We show that the modulations of
ferromagnetic resonance (FMR) exhibiting power-law scalings in frequency and
temperature for NFL metals induced near a quantum critical point (QCP). The
exponents are universal parameters inherited from the QCP and reflect the
non-quasiparticle nature of spin relaxation in NFLs. We demonstrate the
divergent FMR modulations with a particular focus on the Ising nematic QCP at
both zero and finite temperatures, which contradicts the conventional Gilbert
damping mechanism in normal Fermi liquids. Our theoretical proposal could
potentially catalyze a surge in research harnessing insights from
spin-dependent non-equilibrium physics at nanoscale, primarily developed for
room-temperature functioning spin devices in the rapidly progressing field of
spintronics, to access magnetic properties in strongly correlated electron
systems.
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