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Instruments / Technical Area	Publication Details	Published	Actions
I06-Nanoscience (XPEEM)	Elucidation of orbital moment, anisotropy, and magnetic damping in epitaxial Fe3O4 films C. Love , J. E. Beevers , B. Achinuq , R. Fan , K. Matsuzaki , T. Susaki , V. K. Lazarov , S. S. Dhesi , G. Van Der Laan , S. A. Cavill Physical Review B 107 DOI: 10.1103/PhysRevB.107.064414 Diamond Proposal Number(s): [14135] Show Abstract ▼ Abstract: The size of the orbital moment in Fe 3 O 4 has been the subject of a long-standing and contentious debate. In this paper, we make use of ferromagnetic resonance (FMR) spectroscopy and x-ray magnetic circular dichroism (XMCD) to provide complementary determinations of the size of the orbital moment in “bulklike” epitaxial Fe 3 O 4 films grown on yttria-stabilized zirconia (111) substrates. Annealing the 100 nm as-grown films to 1100 ∘ C in a reducing atmosphere improves the stoichiometry and microstructure of the films, allowing for bulklike properties to be recovered as evidenced by x-ray diffraction and vibrating sample magnetometry. In addition, in-plane angular FMR spectra exhibit a crossover from a fourfold symmetry to the expected sixfold symmetry of the (111) surface, together with an anomalous peak in the FMR linewidth at ∼ 10 GHz; this is indicative of low Gilbert damping in combination with two-magnon scattering. For the bulklike annealed sample, a spectroscopic splitting factor g ≈ 2.18 is obtained using both FMR and XMCD techniques, providing evidence for the presence of a finite orbital moment in Fe 3 O 4 .	Feb 2023
	Spatially resolved variations in reflectivity across iron oxide thin films Chris S. Kelley , Sarah M. Thompson , Daniel Gilks , James Sizeland , Leonardo Lari , Vlado K. Lazarov , Kosuke Matsuzaki , Stéphane Lefrançois , Gianfelice Cinque , Paul Dumas Journal Of Magnetism And Magnetic Materials DOI: 10.1016/j.jmmm.2017.04.004 Open Access Show Abstract ▼ Abstract: The spin polarising properties of the iron oxide magnetite (Fe3O4Fe3O4) make it attractive for use in spintronic devices, but its sensitivity to compositional and structural variations make it challenging to prepare reliably. Infrared microspectroscopy and modelling are used to determine the spatial variation in the chemical composition of three thin films of iron oxide prepared using three different deposition methods. The technique is easily able to distinguish between films which contain metallic iron and different iron oxide phases as well as spatial variations in composition across the films.	Apr 2017

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