biostudies-literatureKurumaji TSwiss National Science Foundationeadu6686https://www.ebi.ac.uk/biostudies/studies/S-EPMC11797546biostudies-literatureUnknown11(6)Spin moiré superlattices (SMSs) have been proposed as a magnetic analog of crystallographic moiré systems and a source of electron minibands offering vector-field moiré tunability and Berry curvature effects. However, it has proven challenging to realize an SMS in which a large exchange coupling <i>J</i> is transmitted between conduction electrons and localized spins. Furthermore, most systems have carrier mean free paths <i>l</i>_mfp shorter than their spin moiré lattice constant <i>a</i>_spin, inhibiting miniband formation. Here, we discover that the layered magnetic semimetal EuAg₄Sb₂ overcomes these challenges by forming an interface with <i>J</i> ~ 100 milli-electron volts transferred between a Eu triangular lattice and anionic Ag₂SScience advancesElectronic commensuration of a spin moire superlattice in a layered magnetic semimetal.PMC11797546200021188707Neves PMRotenberg ESuzuki TDenlinger JComin RKurumaji TPaul NGraf DKaxiras ECheckelsky JGWhite JSChan MKZhao YYe LLynn JWNakajima TBostwick AKang MFang SFu LJozwiak CfalseElectronic commensuration of a spin moire superlattice in a layered magnetic semimetal.Spin moiré superlattices (SMSs) have been proposed as a magnetic analog of crystallographic moiré systems and a source of electron minibands offering vector-field moiré tunability and Berry curvature effects. However, it has proven challenging to realize an SMS in which a large exchange coupling <i>J</i> is transmitted between conduction electrons and localized spins. Furthermore, most systems have carrier mean free paths <i>l</i>_mfp shorter than their spin moiré lattice constant <i>a</i>_spin, inhibiting miniband formation. Here, we discover that the layered magnetic semimetal EuAg₄Sb₂ overcomes these challenges by forming an interface with <i>J</i> ~ 100 milli-electron volts transferred between a Eu triangular lattice and anionic Ag₂S2025-01-01T00:00:00Z2025 Feb2025-04-04T07:26:35.908Z2025-04-04T07:26:35.908ZS-EPMC117975463990838610.1126/sciadv.adu6686