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Here we demonstrate a new monoclinic iron oxide phase({\mu}-Fe$_{2}$O$_{3}$), epitaxially stabilized by growth on (010){\beta}-Ga$_{2}$O$_{3}$. Density functional theory (DFT) calculations find thatthe lattice parameters of freestanding {\mu}-Fe$_{2}$O$_{3}$ are within ~1% ofthose of {\beta}-Ga$_{2}$O$_{3}$ and that its energy of formation is comparableto that of naturally abundant Fe$_{2}$O$_{3}$ polytypes. A superlattice of{\mu}-Fe$_{2}$O$_{3}$/{\beta}-Ga$_{2}$O$_{3}$ is grown by plasma assistedmolecular beam epitaxy, with resulting high-resolution x-ray diffraction (XRD)measurements indicating that the {\mu}-Fe$_{2}$O$_{3}$ layers arelattice-matched to the substrate. The measured out-of-plane (b) latticeparameter of 3.12 $\pm$ 0.4 {\AA} is in agreement with the predicted latticeconstants and atomic-resolution scanning transmission electron microscopy(STEM) images confirm complete registry of the {\mu}-Fe$_{2}$O$_{3}$ layerswith {\beta}-Ga$_{2}$O$_{3}$. Finally, DFT modeling predicts that bulk{\mu}-Fe$_{2}$O$_{3}$ is antiferromagnetic, while the interface region between{\mu}-Fe$_{2}$O$_{3}$ and {\beta}-Ga$_{2}$O$_{3}$ leads to ferromagneticcoupling between interface Fe$^{3+}$ cations selectively occupying tetrahedralpositions. Magnetic hysteresis persisting to room temperature is observed viaSQUID measurements, consistent with the computationally predicted interfacemagnetism.

Ferromagnetic Epitaxial {\mu}-Fe$_{2}$O$_{3}$ on {\beta}-Ga$_{2}$O$_{3}$: A New Monoclinic form of Fe$_{2}$O$_{3}$