An AI-MI–supported theoretical study shows that a small easy-plane magnetic anisotropy is the key ingredient enabling magnon-mediated superconductivity in 2D itinerant ferromagnets. Vladimir Calvera, Heqiu Li, Yijie Wang, B. Andrei Bernevig (Princeton), and Andrey V. Chubukov (Minnesota) demonstrate that while equal-spin magnon-mediated pairing vanishes at zero temperature in a spin-symmetric model, introducing weak easy-plane anisotropy restores attractive p-wave pairing—with coupling strength reaching order unity near the ferromagnetic transition, regardless of how small the anisotropy is. The work is motivated by recent experiments on superconductivity in spin- and valley-polarized graphene multilayers.
Source: arXiv:2607.05754