Exfoliation and van der Waals heterostructure assembly of intercalated ferromagnet Cr 1/3 TaS 2

This is the authors' abstract. We don't add key points for this paper.

Ferromagnetic van der Waals (vdW) materials are in demand for spintronic devices with all-two-dimensional-materials heterostructures. Here, we demonstrate mechanical exfoliation of magnetic-atom-intercalated transition metal dichalcogenide Cr 1/3 TaS 2 from its bulk crystal; previously such intercalated materials were thought difficult to exfoliate. Magnetotransport in exfoliated tens-of-nanometres-thick flakes revealed ferromagnetic ordering below its Curie temperature T C ~ 110 K as well as strong in-plane magnetic anisotropy; these are identical to its bulk properties. Further, van der Waals heterostructure assembly of Cr 1/3 TaS 2 with another intercalated ferromagnet Fe 1/4 TaS 2 is demonstrated using a dry-transfer method. The fabricated heterojunction composed of Cr 1/3 TaS 2 and Fe 1/4 TaS 2 with a native Ta 2 O 5 oxide tunnel barrier in between exhibits tunnel magnetoresistance (TMR), revealing possible spin injection and detection with these exfoliatable ferromagnetic materials through the vdW junction.