Shulou(Shulou.com)12/24 Report--

Thanks to CTOnews.com netizen Feitian Noodle Cult chief leader for the clue delivery! CTOnews.com November 23 news, CTOnews.com learned from the official public account of South China University of Technology, the school professor made a breakthrough discovery! Professor Zheng Fengshan of South China University of Technology and Nikolai S. Dr. Kiselev and Filipp N. Dr. Rybakov and others have jointly observed magnetic Hopfion directly in crystals. The results were published in Nature under the title "Hopfion rings in a cubic chiral magnet."

Among them, Professor Zheng Fengshan is the corresponding author and first author, Nikolai S. Kiselev and Filipp N. Rybakov is the co-author; South China University of Technology is the first unit to complete.

Hopf sons, named after German mathematician Heinz Hopf, trace their origins to the concept of topological solitons first proposed by British physicist Tony Skyrme in 1962. In 2009, scientists discovered topological solitons in magnets for the first time, calling them Skyrmion in honor of Skyrme.

It is generally believed that the magnetic lattice is a kind of two-dimensional spiral structure composed of electron spin in space, which penetrates from the upper surface to the lower surface of the sample to form the lattice string. Theoretically, if the two ends are connected, a class of three-dimensional topological magnetic solitons-magnetic Hopf subs will be formed. But so far, no strong evidence has been found experimentally for the existence of magnetic Hopf's.

The joint team used transmission electron microscopy magnetic imaging techniques and micromagnetic calculations to observe Hopf sons coupled with Schromm strings in cubic iron-germanium alloys and provided experimental methods to induce such Hopf sons, with highly reproducible experimental results. The nucleation method changes the direction of the external magnetic field, while ensuring that the magnetic field is weak enough to ensure that the Schmitt string remains intact during the conversion process, and also ensures that the magnetic field is strong enough to change the magnetic state of the edge material of the sample; by switching the magnetic field direction back and forth, this edge-modulated closed magnetic structure will continue to exist stably, and further by increasing the magnetic field strength, Hopf sons coupled with the Schmitt string are formed.

In addition, this study provides a unified homotopy classification of the sigutz-hopf pairs and discusses the diversity of topological solitons in chiral magnets. This breakthrough discovery provides new ideas for the development of future magnetic materials, spinelectronics and non-traditional computing, and also provides strong support for the design and development of new functional devices.

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