Efficient spin filtering through FeGeTe-based van der Waals heterostructures.

Utilizing simulations, we study the spin-dependent electronic transport characteristics within FeGeTe-based van der Waals heterostructures. The electronic density of states for both free-standing and device-configured FeGeTe (F4GT) confirms its ferromagnetic metallic nature and reveals a weak interface interaction between F4GT and PtTe electrodes, enabling efficient spin filtering. The ballistic transport through a double-layer F4GT with a ferromagnetic configuration sandwiched between two PtTe electrodes is predicted to exhibit an impressive spin polarization of 97% with spin-up electrons exhibiting higher transmission probability than spin-down electrons.