Room Temperature Intrinsic Ferromagnetism in Epitaxial Manganese Selenide Films in the Monolayer Limit.

By D. O’Hara, T. Zhu, Amanda H. Trout, Adam S. Ahmed, Y. Luo, C. Lee, M. Brenner, S. Rajan, J. Gupta, D. McComb and 1 more. Nano letters (Print), 2018

654 citations recorded by the source corpus.

Monolayer van der Waals (vdW) magnets provide an exciting opportunity for exploring two-dimensional (2D) magnetism for scientific and technological advances, but the intrinsic ferromagnetism has only been observed at low temperatures. Here, we report the observation of room temperature ferromagnetism in manganese selenide (MnSe x) films grown by molecular beam epitaxy (MBE). Magnetic and structural characterization provides strong evidence that, in the monolayer limit, the ferromagnetism originates from a vdW manganese diselenide (MnSe2) monolayer, while for thicker films it could originate from a combination of vdW MnSe2 and/or interfacial magnetism of α-MnSe(111). Magnetization measurements of monolayer MnSe x films on GaSe and SnSe2 epilayers show ferromagnetic ordering with a large saturation magnetization of ∼4 Bohr magnetons per Mn, which is consistent with the density functional theory calculations predicting ferromagnetism in monolayer 1T-MnSe2. Growing MnSe x films on GaSe up to a high thickness (∼40 nm) produces α-MnSe(111) and an enhanced magnetic moment (∼2×) compared to the monolayer MnSe x samples. Detailed structural characterization by scanning transmission electron microscopy (STEM), scanning tunneling microscopy (STM), and reflection high energy electron diffraction (RHEED) reveals an abrupt and clean interface between GaSe(0001) and α-MnSe(111). In particular, the structure measured by STEM is consistent with the presence of a MnSe2 monolayer at the interface. These results hold promise for potential applications in energy efficient information storage and processing.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/43344e21b5e7fb484666fd4b0e6b849f704a6c60

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Citations in the corpus

Magnetism, symmetry and spin transport in van der Waals layered systems (2021, neutral): “1,14,26,29–31,55–57,61–93”
Colloquium : Spintronics in graphene and other two-dimensional materials (2019, methodology): “A similar approach was later shown using the ISHE of graphene itself (Ohshima et al., 2014).”
Room temperature ferromagnetism in ultra-thin van der Waals crystals of 1T-CrTe2 (2020, background): “Interestingly, for the transition metal dichalcogenide that are reported to be room temperature ferromagnets, VSe2, MnTe2, MnSex, and CrTe2, all have a 1T phase, where the local coordination of the transition metal atoms and chalcogenide atoms form an octahedral (Figs.”
Probing and controlling magnetic states in 2D layered magnetic materials (2019, neutral): “95 ) .”