Cleavable crystals, crystal structure, and magnetic properties of the NbFe_1+xTe₃ layered van der Waals telluride

Abstract

Transition metal-based two-dimensional nanomaterials with competing magnetic states are at the cutting edge of spintronic and low power memory devices. In this paper, we present Fe-rich NbFe1+xTe3 layered telluride (x...

Bulk ferromagnetism in cleavable van der Waals telluride NbFeTe2

“…† Fe(1) can be associated with the main Fe1 crystallographic position (see Table S2 of ESI †), while the minor Fe(2) component may appear due to the low quantity of disordered Fe atoms located in the interstitial region, as was observed in related NbFe 1+x Te 3 and F3GT vdW tellurides. 10,19 The measured isomer shift corresponds to high-spin Fe 3+ cations in a tetrahedral or octahedral environment of Te. 25 The measured isomer shift is slightly lower than those of binary and ternary Fe-based tellurides.…”

“…Akin to F3GT and F5GT, NbFe 1+ x Te 3 19 and NbFeTe 2 (NFT) vdW tellurides are promising functional materials. The latter NFT compound forms an orthorhombic crystal structure.…”

“…Importantly, it is possible to use molecular beam epitaxy to prepare the vdW tellurides on a large scale, which enables manufacturing of functional devices based on high-quality thin films. 18 Akin to F3GT and F5GT, NbFe 1+x Te 3 19 and NbFeTe 2 (NFT) vdW tellurides are promising functional materials. The latter NFT compound forms an orthorhombic crystal structure.…”