Spin-dependent transport in Fe3GaTe2 and FenGeTe2 (n=3-5) van der Waals ferromagnets for magnetic tunnel junctions
Abstract
We present a systematic first-principles investigation of linear-response spin-dependent quantum transport in the van der Waals ferromagnets Fe3GeTe2, Fe4GeTe2, Fe5GeTe2, and Fe3GaTe2. Using density functional theory combined with the non-equilibrium Green's function formalism, we compute their Fermi surfaces, transmission coefficients, and orbital-projected density of states. All compounds exhibit nearly half-metallic conductance along the out-of-plane direction. This is characterized by a finite transmission coefficient for one spin channel and a gap in the other, resulting in spin polarization values exceeding 90\% in the bulk. Notably, Fe3GaTe2 displays the ideal half-metallic behavior, with the Fermi energy located deep in the spin-down transmission gap. We further show that this high spin polarization is preserved in bilayer magnetic tunnel junctions, which exhibit a large tunnel magnetoresistance of the order of several hundred percent. This findings underscore the promise of these materials, and in particular of Fe3GaTe2, for spintronics applications.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.