Altering the magnetic ordering of Fe3Ga4 via thermal annealing and hydrostatic pressure
| Autor: | Brandon Wilfong, Michelle E. Jamer, Omar Bishop, Joseph Prestigiacomo, Radhika Barua, Steven Bennett, Jared Naphy, Vaibhav Sharma |
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| Rok vydání: | 2022 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Condensed matter physics Annealing (metallurgy) Rietveld refinement Mechanical Engineering Transition temperature Hydrostatic pressure Metals and Alloys Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences Ferromagnetism Mechanics of Materials Phase (matter) 0103 physical sciences Materials Chemistry 010306 general physics 0210 nano-technology Single crystal |
| Zdroj: | Journal of Alloys and Compounds. 894:162421 |
| ISSN: | 0925-8388 |
| Popis: | The effects of post-synthesis annealing temperature on arc-melted samples of Fe$_{3}$Ga$_{4}$ has been studied to investigate changes in crystallographic and magnetic properties induced by annealing. Results show a significant trend in the evolution of the (incommensurate spin density wave) ISDW-FM (ferromagnetic) transition temperature as a function of the refined unit cell volume in annealed samples. Strikingly, this trend allowed for the tuning of the transition temperature down to room-temperature (300 K) whilst maintaining a sharp transition in temperature, opening the door to the use of Fe$_{3}$Ga$_{4}$ in functional devices. Crystallographic analysis through Rietveld refinement of high-resolution x-ray diffraction data has showed that arc-melted stoichiometric Fe$_{3}$Ga$_{4}$ is multi-phase regardless of annealing temperature with a minor phase of FeGa$_{3}$ decreasing in phase fraction at higher annealing temperature. In order to validate the trend in ISDW-FM transition temperature with regard to unit cell volume, high pressure magnetometry was performed. This showed that the FM-ISDW ($\sim$ 68 K) and ISDW-FM ($\sim$ 360 K) transition temperatures could be tuned, increased and decreased respectively, linearly with external pressure. Thus, external pressure and the ensuing crystallographic changes minimize the temperature range of the stability of the ISDW pointing toward the importance of structural properties on the mechanism for the formation of the intermediate ISDW phase. These results show how this model system can be tuned as well as highlighting the need for future high-pressure crystallography and related single crystal measurements to understand the mechanism and nature of the intermediate ISDW phase to be exploited in future devices. |
| Databáze: | OpenAIRE |
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