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I06-Nanoscience (XPEEM)	Valence-state mixing and reduced magnetic moment in Fe 3−δ GeTe 2 single crystals with varying Fe content probed by X-ray spectroscopy Dirk Backes , Ryuji Fujita , Larissa S. I. Veiga , Daniel Mayoh , George Wood , Sarnjeet Dhesi , Geetha Balakrishnan , Gerrit Van Der Laan , Thorsten Hesjedal Nanotechnology DOI: 10.1088/1361-6528/ad5e87 Diamond Proposal Number(s): [27482] Open Access Show Abstract ▼ Abstract: We present a spectroscopic study of the magnetic properties of Fe3-δGeTe2 single crystals with varying Fe content, achieved by tuning the stoichiometry of the crystals. We carried out x-ray absorption spectroscopy and analyzed the x-ray circular magnetic dichroism spectra using the sum rules, to determine the orbital and spin magnetic moments of the materials. We ﬁnd a clear reduction of the spin and orbital magnetic moment with increasing Fe deﬁciency. Magnetic susceptibility measurements show that the reduction in magnetization is accompanied by a reduced Curie temperature. Multiplet calculations reveal that the Fe2+ state increasingly mixes with a higher valence state when the Fe deﬁciency is increased. This eﬀect is correlated with the weakening of the magnetic moment. As single crystals are the base material for exfoliation processes, our results are relevant for the assembly of 2D magnetic heterostructures.	Jul 2024

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