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The effects of post-synthesis annealing temperature on arc-melted samples ofFe$_{3}$Ga$_{4}$ has been studied to investigate changes in crystallographicand magnetic properties induced by annealing. Results show a significant trendin the evolution of the (incommensurate spin density wave) ISDW-FM(ferromagnetic) transition temperature as a function of the refined unit cellvolume in annealed samples. Strikingly, this trend allowed for the tuning ofthe transition temperature down to room-temperature (300 K) whilst maintaininga sharp transition in temperature, opening the door to the use ofFe$_{3}$Ga$_{4}$ in functional devices. Crystallographic analysis throughRietveld refinement of high-resolution x-ray diffraction data has showed thatarc-melted stoichiometric Fe$_{3}$Ga$_{4}$ is multi-phase regardless ofannealing temperature with a minor phase of FeGa$_{3}$ decreasing in phasefraction at higher annealing temperature. In order to validate the trend inISDW-FM transition temperature with regard to unit cell volume, high pressuremagnetometry was performed. This showed that the FM-ISDW ($\sim$ 68 K) andISDW-FM ($\sim$ 360 K) transition temperatures could be tuned, increased anddecreased respectively, linearly with external pressure. Thus, externalpressure and the ensuing crystallographic changes minimize the temperaturerange of the stability of the ISDW pointing toward the importance of structuralproperties on the mechanism for the formation of the intermediate ISDW phase.These results show how this model system can be tuned as well as highlightingthe need for future high-pressure crystallography and related single crystalmeasurements to understand the mechanism and nature of the intermediate ISDWphase to be exploited in future devices.

Altering the magnetic ordering of Fe$_{3}$Ga$_{4}$ via thermal annealing and hydrostatic pressure