Superlattices of antiferromagnetic μ-Fe2O3 and diamagnetic β-Ga2O3 are grown by plasma-assisted molecular beam epitaxy on (010) oriented β-Ga2O3 substrates in which ferromagnetism emerges above room temperature. To investigate the suspected interface origin of the ferromagnetic phase, identical superlattice structures are grown at various substrate temperatures and beam fluxes. Atomic-resolution scanning transmission electron microscopy images confirm the registry of μ-Fe2O3 to the β-Ga2O3 layers in these superlattices. Atomic force microscopy and high-resolution x-ray diffraction are used to examine the growth morphology and characterize the superlattice interface roughness. The saturation magnetization of the ferromagnetic phase is observed to increase strongly with the interface roughness. Conversely, smoother superlattices exhibit a weaker ferromagnetic response and a higher density of paramagnetic moments along with evidence of superparamagnetic clusters. These findings are consistent with the interface origin for the ferromagnetic response in these superlattices. The demonstration of an interface magnetic phase in nearly lattice-matched monoclinic Fe2O3/Ga2O3 opens the door to ultrawide bandgap heterostructure-engineered magnetoelectronic devices, where ferromagnetic switching of the interface phase can be incorporated into high-field devices.
Skip Nav Destination
CHORUS
Article navigation
December 2020
Research Article|
November 06 2020
Interface-induced ferromagnetism in μ-Fe2O3/β-Ga2O3 superlattices
Elline C. Hettiaratchy
;
Elline C. Hettiaratchy
1
Department of Material Science and Engineering, The Ohio State University
, Columbus, Ohio 43210
Search for other works by this author on:
John S. Jamison;
John S. Jamison
1
Department of Material Science and Engineering, The Ohio State University
, Columbus, Ohio 43210
Search for other works by this author on:
Binbin Wang;
Binbin Wang
1
Department of Material Science and Engineering, The Ohio State University
, Columbus, Ohio 43210
Search for other works by this author on:
Núria Bagués;
Núria Bagués
2
Center for Electron Microscopy and Analysis, The Ohio State University
, Columbus, Ohio 43212
Search for other works by this author on:
Rachel A. Guest;
Rachel A. Guest
1
Department of Material Science and Engineering, The Ohio State University
, Columbus, Ohio 43210
Search for other works by this author on:
David W. McComb
;
David W. McComb
1
Department of Material Science and Engineering, The Ohio State University
, Columbus, Ohio 432102
Center for Electron Microscopy and Analysis, The Ohio State University
, Columbus, Ohio 43212
Search for other works by this author on:
Roberto C. Myers
Roberto C. Myers
a)
1
Department of Material Science and Engineering, The Ohio State University
, Columbus, Ohio 432103
Department of Electrical and Computer Engineering, The Ohio State University
, Columbus, Ohio 43210
Search for other works by this author on:
a)
Electronic mail: [email protected]
Note: This paper is part of the Special Topic Collection: Honoring Dr. Art Gossard's 85th Birthday and his Leadership in the Science and Technology of Molecular Beam Epitaxy.
J. Vac. Sci. Technol. A 38, 063413 (2020)
Article history
Received:
September 07 2020
Accepted:
October 16 2020
Citation
Elline C. Hettiaratchy, John S. Jamison, Binbin Wang, Núria Bagués, Rachel A. Guest, David W. McComb, Roberto C. Myers; Interface-induced ferromagnetism in μ-Fe2O3/β-Ga2O3 superlattices. J. Vac. Sci. Technol. A 1 December 2020; 38 (6): 063413. https://doi.org/10.1116/6.0000612
Download citation file:
Pay-Per-View Access
$40.00
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Citing articles via
Surface passivation approaches for silicon, germanium, and III–V semiconductors
Roel J. Theeuwes, Wilhelmus M. M. Kessels, et al.
Low-temperature etching of silicon oxide and silicon nitride with hydrogen fluoride
Thorsten Lill, Mingmei Wang, et al.
Atomic layer deposition of nanofilms on porous polymer substrates: Strategies for success
Brian C. Welch, Jeanne Casetta, et al.
Related Content
Quantitative x-ray diffraction analysis of strain and interdiffusion in β-Ga2O3 superlattices of μ-Fe2O3 and β-(AlxGa1−x)2O3
J. Vac. Sci. Technol. A (November 2022)
Phase control of α- and κ-Ga2O3 epitaxial growth on LiNbO3 and LiTaO3 substrates using α-Fe2O3 buffer layers
AIP Advances (May 2020)
β-(AlxGa1−x)2O3/Ga2O3 (010) heterostructures grown on β-Ga2O3 (010) substrates by plasma-assisted molecular beam epitaxy
J. Vac. Sci. Technol. A (June 2015)
Play the heavy: An effective mass study for α-Fe2O3 and corundum oxides
J. Chem. Phys. (April 2016)