Researchers provide direct evidence that the magnetic properties of the novel icosahedral quasicrystals depend on the electrons-per-atom ratio. Professor Ryuji Tamura's team at Tokyo University of Science synthesized a novel icosahedral quasicrystal (i QC) made of gold, gallium, and dysprosium. T
QCs because they have also contained a large fraction of the approximant crystal phase. ACs have a similar structure to QCs, but as they are also magnetic, this interferes with studies on the magnetism of the QC phase alone.
The new i QCs were prepared using mother alloys containing 15% Dy, 62–68% Au, and 23–17% Ga. The mother alloys were synthesized via arc-melting followed by rapid quenching. The resultant i QCs were studied using powder X-ray diffraction, electron microscopy, electron diffraction, and magnetic susceptibility measurements.
The researchers also discovered that the new i QCs exhibit a maximum Weiss temperature, a significant parameter in ferromagnetic transition, at an electrons-per-atom ratio of 1.70, which aligns with previous findings for ACs. This discovery demonstrates that the magnetic properties of i QCs can be well-tuned using the Weiss temperature and e/a ratio .
“The discovery of pure tunable ferromagnetic quasicrystals has the potential to revolutionize and expand the academic system based on crystals. Applying our findings to current theoretical work in the field, for example, in the realm of non-coplanar spin configurations such as hedgehog and whirling configurations, can lead to various nontrivial physical properties in i QCs, including anomalous and topological Hall effects,” concludes Prof. Tamura.
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