Fig. 3: TMR in AMFTJs with colinear AFM electrodes due to momentum-dependent spin polarization.
a Schematics of the magnetic structure and the Fermi surface of a collinear antiferromagnet with magnetization compensated by \(\hat{P}\hat{T}\) symmetry. The symmetry enforces spin degeneracy of the Fermi surface and conduction channels (indicated by gray color). b Schematics of the magnetic structure and the Fermi surface of a collinear antiferromagnet with magnetization compensated by two glide symmetries \({\hat{G}}_{x}\) and \({\hat{G}}_{y}\). The symmetries allow spin splitting at wavevectors away from the \({\hat{G}}_{x}\) and \({\hat{G}}_{y}\) invariant planes (indicated by red and blue colors). This leads to the momentum-dependent spin polarization that is compensated in the (001) plane and uncompensated in the (110) plane. c Schematic of an AFMTJ with two AFM electrodes and a nonmagnetic tunnel barrier. d The atomic structure of a collinear AFM RuO2, which hosts two sublattices RuA and RuB with antiparallel magnetic moments. e Momentum-dependent conduction channels and associated spin polarizations in the 2D Brillouin zone of RuO2 (001). f Calculated momentum-dependent transmission of a RuO2/TiO2/RuO2 (001) AFMTJ. Figures c–f are reprinted from ref. 6. under permission of the Creative Commons CC BY license.
