Heteroepitaxy of Two-dimensional CuCr 2 Te 4 with Robust Room-temperature Ferromagnetism.

Magnetic materials in two-dimensional (2D) have attracted widespread attention for their intriguing magnetic properties. 2D magnetic heterostructures can provide unprecedented opportunities for exploring fundamental physics and novel spintronic devices. Here, w e report the heteroepitaxial growth of ferromagnetic CuCr 2 Te 4 nanosheets on Cr 2 Te 3 and mica by chemical vapor deposition. Magneto-optical Kerr effect measurements revealed the thickness-dependent ferromagnetism of CuCr 2 Te 4 nanosheets on mica, where a decrease of Curie temperature (T C ) from 320 K to 260 K and an enhancement of perpendicular magnetic anisotropy with reducing thickness w ere observed. Moreover, lattice-matched heteroepitaxial ultrathin CuCr 2 Te 4 on Cr 2 Te 3 exhibits an enhanced robust ferromagnetism with T C up to 340 K due to the interfacial charge transfer. Stripe-type magnetic domains and single magnetic domain w ere discovered in this heterostructure with different thicknesses. O ur work provides a way to construct robust room-temperature 2D magnetic heterostructures for functional spintronic devices. This article is protected by copyright. All rights reserved.