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arXiv · 2308.02189

Spin pumping effect in non-Fermi liquid metals

Xiao-Tian Zhang·Yi-Hui Xing·Xu-Ping Yao·Yuya Ominato·Long Zhang·Mamoru Matsuo
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Abstract

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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Xiao-Tian Zhang, Yi-Hui Xing, Xu-Ping Yao, Yuya Ominato, Long Zhang, Mamoru Matsuo. 2023-08-04. Spin pumping effect in non-Fermi liquid metals. https://doi.org/10.1038/s42005-025-02033-0

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