The long-range magnetic order is revealed by Icosahedral quasicrystals. The University of Science in Tokyo.
Since the discovery of quasicrystals, scientists have sought physical properties related to their peculiar structure. A group of researchers led by Tokyo University of Science have reported a long-range magnetic order in QCs with icosahedral symmetry that turns ferromagnetism below certain temperatures.
A five-fold rotation symmetry was discovered in 1984 by a routine examination of an aluminum-manganese alloy. The discovery of a QC led to some exotic symmetries being absent in crystals. Since then, the subject of QCs has been of enormous scientific interest.
Their potential applications are uncertain since no physical property of their long-range quasiperiodic order has been observed. That is until now.
A group of scientists led by Professor Ryuji Tamura of Tokyo University of Science, Professor Taku J. Sato of Tohoku University, and Professor Maxim Avdeev of the Australian Nuclear Science and Technology Organisation published a study in the Journal of the American Chemical Society. Asuka Ishikawa and Shintaro Suzuki were members of the Tamura Laboratory at TUS.
"This successful synthesis of ferromagnetic i QCs is the culmination of more than 10 years of research in our laboratory," says Tamura, " Nobody knows what kind of peculiar behavior they will further reveal or how they can be exploited for the advancement of technology, but now we have finally taken The development of science will be greatly improved if we know the properties of these ferromagnetic QCs.
ferromagnetism, antiferromagnetism, paramagnetism, and diamagnetism are the major types of magnetic order. The research group was inspired by the discovery of antiferromagnetic and ferromagnetic transitions in approximant crystals, which can be studied using conventional techniques. They observed the formation of an icosahedral quasicrystal phase for both Au- Ga-Gd and Au- Ga-Tb.
They used magnetic susceptibility and heat to investigate the properties of the two i QCs. The ferromagnetic phase transition at 23 K and 16 K was a signature of long-range magnetic order. They looked at the neutron patterns of the i QCs at different temperatures in order to further confirm the results. The Bragg peaks below their respective transition temperatures were confirmed by the ferromagnetic nature of the i QCs.
The attempts to make magnetic i QCs have all ended in "spin-glass-like freezing", which is a disordered magnetic state. The discovery of long-range ferromagnetic order in this study has consequences far beyond the physical properties of materials. Tamura says that ferromagnetic QCs are ultra soft magnetic materials because of their higher crystal symmetry.
It took a long time to find long-range magnetic order in i QCs. It won't be long before the world sees what the discovery entails.
The Journal of the American Chemical Society has more information about the experiment. There is a book titled "jacs.1c09954."
The Journal of the American Chemical Society has information.
Scientists discovered the first ferromagnetic quasicrystals on November 22, 2021.
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