J. Mater. Sci. Technol. ›› 2023, Vol. 164: 179-187.DOI: 10.1016/j.jmst.2023.04.059

• Research Article • Previous Articles     Next Articles

A class of high-mobility layered nanomaterials by design

Dmitry V. Averyanov, IvanS. Sokolov, OlegE. Parfenov, AlexanderN. Taldenkov, Oleg A. Kondratev, Andrey M. Tokmache v, Vyacheslav G. Storchak*   

  1. National Research Center “Kurchatov Institute”, Kurchatov Sq. 1, Moscow 123182, Russia
  • Received:2023-03-10 Revised:2023-04-24 Accepted:2023-04-25 Published:2023-11-20 Online:2023-11-15
  • Contact: *E-mail address: vgstorchak9@gmail.com (V.G. Storchak).

Abstract: Design of materials with particular functional properties is indispensable albeit very challenging. Chemical and structural analogies can be helpful in this endeavor, especially when a particular combination of properties is sought after. Our aim is to bundle together 3 characteristics: high carrier mobility, magnetism, and scalability to nanomaterials in the form of a film - such a combination is particularly advantageous for spintronics. Here, inspired by recent studies of MAl2Si2 and related compounds, we develop magnetic EuAl2Ge2 and non-magnetic SrAl2Ge2 nanomaterials with high carrier mobility. Topotactic syntheses employing sacrificial 2D templates result in epitaxial films of MAl2Ge2 seamlessly integrated with germanium. The syntheses are followed by a study of the atomic structure, magnetic and electron transport properties. In particular, the films demonstrate high carrier mobility, exceeding 10,000 cm2 V-1 s-1 in the case of EuAl2Ge2, making the materials appealing for applications. Taken together, MAl2Ge2 and MAl2Si2 form a class of high-mobility layered nanomaterials.

Key words: High carrier mobility, Magnetism, SrAl2Ge2, EuAl2Ge2, Germanium