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In order to tune the magnetic properties of the cleavable high-Curietemperature ferromagnet Fe$_{5-x}$GeTe$_2$, the effect of increasing theelectron count through arsenic substitution has been investigated. Smalladditions of arsenic (2.5 and 5%) seemingly enhance ferromagnetic order inpolycrystalline samples by quenching fluctuations on one of the three magneticsublattices, whereas larger As concentrations decrease the ferromagnetic Curietemperature ($T_{\rm C}$) and saturation magnetization. This work alsodescribes the growth and characterization of Fe$_{4.8}$AsTe$_2$ single crystalsthat are structurally analogous to Fe$_{5-x}$GeTe$_2$ but with some phasestability complications. Magnetization measurements reveal dominantantiferromagnetic behavior in Fe$_{4.8}$AsTe$_2$ with a N\'{e}el temperature of$T_{\rm N}$ $\approx$42K. A field-induced spin-flop below $T_{\rm N}$ resultsin a switch from negative to positive magnetoresistance, with significanthysteresis causing butterfly-shaped resistance loops. In addition to reportingthe properties of Fe$_{4.8}$AsTe$_2$, this work shows the importance ofmanipulating the individual magnetic sublattices in Fe$_{5-x}$GeTe$_2$ andmotivates further efforts to control the magnetic properties in relatedmaterials by fine tuning of the Fermi energy or crystal chemistry.

Tuning the Room Temperature Ferromagnetism in Fe5GeTe2 by Arsenic Substitution