Epitaxial Ferrimagnetic Mn4N Thin Films on GaN by Molecular Beam Epitaxy

Direct epitaxial integration of magnetic layers with wide bandgap nitride semiconductors will enable spin-controlled transport and photonic phenomena, seeding ideas for functional spintronic devices. Using plasma-assisted molecular beam epitaxy (MBE) in a previously unexplored window, significantly...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2022-02, Vol.58 (2), p.1-6
Main Authors: Zhang, Zexuan, Cho, Yongjin, Gong, Mingli, Ho, Shao-Ting, Singhal, Jashan, Encomendero, Jimy, Li, Xiang, Lee, Hyunjea, Xing, Huili Grace, Jena, Debdeep
Format: Article
Language:English
Subjects:
Diffraction
Diffraction patterns
Ferrimagnet
Gallium nitride
Gallium nitrides
Hall effect
Magnetic properties
Magnetism
Manganese
manganese nitride
Molecular beam epitaxial growth
Molecular beam epitaxy
molecular beam epitaxy (MBE)
Photonic band gaps
Plasma temperature
Saturation magnetization
Substrates
Surface morphology
Surface roughness
Thin films
Transport phenomena
Transport properties
wide bandgap semiconductor
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Summary:Direct epitaxial integration of magnetic layers with wide bandgap nitride semiconductors will enable spin-controlled transport and photonic phenomena, seeding ideas for functional spintronic devices. Using plasma-assisted molecular beam epitaxy (MBE) in a previously unexplored window, significantly improved ferrimagnetic Mn 4 N layers are successfully grown on GaN with ~1 nm surface roughness. Distinct from earlier reports, the Mn 4 N layers grown on GaN are found to be [001] oriented with 12-fold in-plane symmetry in the diffraction pattern. This unique epitaxial registry originates from three equivalent rotational domains. The ferrimagnetic magnetotransport properties of low growth temperature Mn 4 N layers on GaN are comparable to those reported on cubic substrates such as MgO. However, a sign-flip of the Hall resistance is discovered for Mn 4 N layers grown above 300 °C.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2021.3085853