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arXiv · 2404.18616

Nonlinear Superconducting Magnetoelectric Effect

Jin-Xin Hu·Oles Matsyshyn·Justin C. W. Song
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Abstract

Supercurrent flow can induce a nonvanishing spin magnetization in noncentrosymmetric superconductors with spin-orbit interaction. Often known as the non-dissipative magnetoelectric effect, these are most commonly found at linear order in supercurrent flow. Here, we propose that a {\it nonlinear} superconducting magnetoelectric (NSM) effect can naturally manifest in magnet/superconductor heterostructures. In such platforms, NSM manifests as the spin polarization generated as a second-order response to a driving supercurrent. Strikingly, we find NSM survives centrosymmetry and is the leading order magnetic response in a variety of magnetic materials that include both collinear magnets [e.g., $d$-wave planar altermagnet thin film/superconductor (ALM/SC)] as well as noncollinear magnets (e.g., Kagome/SC systems). This renders NSM a powerful electric and non-dissipative means of controlling magnetization in magnet/superconductor heterostructures, a promising platform for superconducting spintronics.

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Jin-Xin Hu, Oles Matsyshyn, Justin C. W. Song. 2024-04-29. Nonlinear Superconducting Magnetoelectric Effect. https://doi.org/10.1103/physrevlett.134.026001

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