Kavli Affiliate: Long Zhang
| First 5 Authors: Xiao-Tian Zhang, Yi-Hui Xing, Xu-Ping Yao, Yuya Ominato, Long Zhang
| 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 exhibit power-law scalings in frequency and temperature
for NFL metals induced near a quantum critical point (QCP). At the Ising
nematic QCP, we demonstrate that the enhanced Gilbert damping coefficient
$delta alpha$ acquires negative power-law exponents in distinct frequency
regimes. The exponents convey universal parameters inherited from the QCP and
reflect the non-quasiparticle nature of the spin carriers in the NFL metal. At
finite temperature, we show that the Gilbert damping mechanism is restored in
the quantum critical regime and $delta alpha$ measures the temperature
dependence of the correlation length. Our theoretical proposal has the
potential to stimulate the development of an interdisciplinary research domain
where insights from non-equilibrium spin physics in spintronics are integrated
into strongly correlated matter.
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