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arXiv · 1709.08313

Exfoliation and van der Waals heterostructure assembly of intercalated ferromagnet Cr1/3TaS2

Yuji Yamasaki·Rai Moriya·Miho Arai·Satoru Masubuchi·Sunseng Pyon·Tsuyoshi Tamegai·Keiji Ueno·Tomoki Machida
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Abstract

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 Cr1/3TaS2 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 TC ~ 110 K as well as strong in-plane magnetic anisotropy; these are identical to its bulk properties. Further, van der Waals heterostructure assembly of Cr1/3TaS2 with another intercalated ferromagnet Fe1/4TaS2 is demonstrated using a dry-transfer method. The fabricated heterojunction composed of Cr1/3TaS2 and Fe1/4TaS2 with a native Ta2O5 oxide tunnel barrier in between exhibits tunnel magnetoresistance (TMR), revealing possible spin injection and detection with these exfoliatable ferromagnetic materials through the vdW junction.

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Yuji Yamasaki, Rai Moriya, Miho Arai, Satoru Masubuchi, Sunseng Pyon, Tsuyoshi Tamegai, Keiji Ueno, Tomoki Machida. 2017-09-25. Exfoliation and van der Waals heterostructure assembly of intercalated ferromagnet Cr1/3TaS2. https://doi.org/10.1088/2053-1583%2Faa8a2b

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