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Title: Epitaxial columnar growth of strain-free antiferromagnetic Weyl semimetal Mn3Sn on wurtzite c-plane GaN/Al2O3(0001)

Journal Article · · Journal of Crystal Growth

Weyl semimetal thin films with excellent crystalline quality are of great interest for antiferromagnetic spintronics. Mn3Sn is one Weyl semimetal with great properties and promise for exciting science and applications. It has proven very challenging, however, to grow Mn3Sn thin films with smooth surfaces, negligible strain, and excellent crystallinity. In this work, we discuss the successful preparation of epitaxial Mn3Sn (0001)-oriented thin films via molecular beam epitaxial growth on c-plane wurtzite GaN which was grown by MBE on Al2O3 (0001). We present the reflection high energy electron diffraction analysis along with x-ray diffraction in order to demonstrate the crystalline quality of the film, and we give atomic models to explain the epitaxial orientation relationships between the crystal lattices of the substrate, GaN layer, and Mn3Sn layer. Importantly, we discuss the film lattice parameters as compared to expected values, demonstrating negligible strain both in-plane and out-of-plane. Atomic force microscopy reveals an epitaxial columnar growth mode characterized by flat-top-mesa islands, while scanning tunneling microscopy shows the atomically smooth surfaces of the mesa-top structures. Finally, Rutherford backscattering informs the stoichiometry of the film as well as the layer thicknesses.

Research Organization:
Ohio Univ., Athens, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
FG02-06ER46317
OSTI ID:
3008605
Journal Information:
Journal of Crystal Growth, Journal Name: Journal of Crystal Growth Vol. 676; ISSN 0022-0248
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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