Imperial College London
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Professor David W. McComb

Faculty of Engineering, Department of Materials

Adjunct Professor
 
 
 
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Contact

 

+44 (0)20 7594 6750d.mccomb Website

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Jamison:2019:10.1021/acs.cgd.9b00029,
author = {Jamison, JS and May, BJ and Deitz, JI and Chien, SC and McComb, DW and Grassman, TJ and Windl, W and Myers, RC},
doi = {10.1021/acs.cgd.9b00029},
journal = {Crystal Growth and Design},
pages = {4205--4211},
title = {Ferromagnetic Epitaxial μ-Fe<inf>2</inf>O<inf>3</inf> on β-Ga<inf>2</inf>O<inf>3</inf>: A New Monoclinic Form of Fe<inf>2</inf>O<inf>3</inf>},
url = {http://dx.doi.org/10.1021/acs.cgd.9b00029},
volume = {19},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Here we demonstrate a new monoclinic iron oxide phase (μ-Fe2O3), epitaxially stabilized by growth on (010) β-Ga2O3. Density functional theory (DFT) calculations find that the lattice parameters of freestanding μ-Fe2O3 are within ∼1% of those of β-Ga2O3, and that its energy of formation is comparable to that of naturally abundant Fe2O3 polytypes. A superlattice of μ-Fe2O3/β-Ga2O3 is grown by plasma assisted molecular beam epitaxy, with resulting high-resolution X-ray diffraction (XRD) measurements indicating that the μ-Fe2O3 layers are lattice-matched to the substrate. The measured out-of-plane (b) lattice parameter of 3.12 ± 0.4 Å is in agreement with the predicted lattice constants and atomic-resolution scanning transmission electron microscopy (STEM) images confirm complete registry of the μ-Fe2O3 layers with β-Ga2O3. Finally, DFT modeling predicts that bulk μ-Fe2O3 is antiferromagnetic, while the interface region between μ-Fe2O3 and β-Ga2O3 leads to ferromagnetic coupling between interface Fe3+ cations selectively occupying tetrahedral positions. Magnetic hysteresis persisting to room temperature is observed via SQUID measurements, consistent with the computationally predicted interface magnetism. ©
AU  - Jamison,JS
AU  - May,BJ
AU  - Deitz,JI
AU  - Chien,SC
AU  - McComb,DW
AU  - Grassman,TJ
AU  - Windl,W
AU  - Myers,RC
DO  - 10.1021/acs.cgd.9b00029
EP  - 4211
PY  - 2019///
SN  - 1528-7483
SP  - 4205
TI  - Ferromagnetic Epitaxial μ-Fe<inf>2</inf>O<inf>3</inf> on β-Ga<inf>2</inf>O<inf>3</inf>: A New Monoclinic Form of Fe<inf>2</inf>O<inf>3</inf>
T2  - Crystal Growth and Design
UR  - http://dx.doi.org/10.1021/acs.cgd.9b00029
VL  - 19
ER  -
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