The ferromagnetism of the topological insulator manganese bismuth telluride only arises when the atomic structure becomes disordered. For this, some manganese atoms (green) must be moved out of their original position (second green atomic plane from the top). Only when there are also manganese atoms in all planes with bismuth atoms (gray), the magnetic alignment of the manganese atoms is so contagious that ferromagnetism develops.
The ferromagnetism of the topological insulator manganese bismuth telluride only arises when the atomic structure becomes disordered. For this, some manganese atoms ( green ) must be moved out of their original position (second green atomic plane from the top). Only when there are also manganese atoms in all planes with bismuth atoms (gray), the magnetic alignment of the manganese atoms is so contagious that ferromagnetism develops. The Würzburg-Dresden Cluster of Excellence ct.qmat has designed a ferromagnetic topological insulator - a milestone on the way to energy-efficient quantum technologies. Back in 2019, an international research team led by materials chemist Anna Isaeva - then a junior professor at the Würzburg-Dresden Cluster of Excellence ct.qmat - Complexity and Topology in Quantum Materials - achieved a minor sensation with the fabrication of the first antiferromagnetic topological insulator manganese bismuth telluride (MnBi2Te4). This wonder material no longer needs a strong external magnetic field - it brings along its own internal magnetic field. This offers the opportunity for new types of electronic components that encode information magnetically and transport it on the surface without resistance.
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