Recently, Du Haifeng, a researcher at the Tianliangliang Research Group of the Strong Magnetic Field Science Center of the Hefei Institute of Material Science, Chinese Academy of Sciences, and the team led by the team of RE Ulin-Borkowski and Nikolai S. Kiselev, professors of the Ulysse Research Center in Germany, used electronic holography. In the quasi-two-dimensional spiral magnetic material FeGe nanostructure, a new three-dimensional local magnetic structure called "magnetic float" was discovered. The related results were published in the journal with the observation of chiral magnetic bobbers in B20-type FeGe. "Nature Nanotechnology".
Binary is a system widely used in computing technology and is the basis of the entire data storage. Binary data is a number represented by two numbers "0" and "1". In a specific physical carrier, "0" and "1" are realized by using two steerable physical states of a physical entity, such as calculating two magnetization directions of magnetic domains in a hard disk. In 2009, German scientists discovered a topological magnetic structure with particle characteristics in a class of spiral magnetic materials, namely, Skyrmion. With a small size, high stability and easy handling, Sigman can be used as a basic data bit to build future high-density, high-speed, low-energy magnetic memories. But for a long time, Sigman is considered to be the only local magnetic structure in such materials, so it can only be used as a "1" or "0" in the binary data bits, and the ferromagnetic state can be used as another data bit. Carrier. However, since the sigmoid itself exists in the ferromagnetic background, external factors such as thermal disturbances may cause the sigmoid to drift, causing disturbances in the actual information storage. The construction of artificial defects between magnetic memory cells can limit the disordered motion of sigmoids, but will undoubtedly increase the complexity and cost of device design.
The interaction between magnetic topological states can effectively suppress their spontaneous drift. However, the same magnetic topological structure, such as magnetism, is difficult to achieve the discrimination of different data bits of "0" and "1". Therefore, finding a new local magnetic structure is the main way to solve this problem. In 2015, German scientists first predicted that there is still a magnetic structure—Magnetic Chiral Bobber—in a certain thickness of spiral magnetic material. The magnetic float is a new type of local magnetic structure floating on the surface of the material. It can replace the ferromagnetic state as a data bit "0" applied to the memory design. This new design can safely avoid additional structures such as artificial defects. Simple and low cost advantages.
In this work, the strong magnetic field center team used the focused ion beam technology to prepare high-quality nanostructure samples. Through the experimental exploration with the Ulysses team in Germany, the electronic holography technology was used in the real space for the first time in the FeGe nanomaterials. The magnetic float was directly observed, and it was further found that the magnetic float can coexist with the sigmoid. The results of this study not only extend the range of topological magnetic structures in chiral magnets, but also provide a good basis for related device design.
In this work, Du Haifeng and Nikolai S. Kiselev of Germany are co-authors of the paper.
The research work was funded by the National Key Research Project Special Fund, the Chinese Academy of Sciences Key Deployment Project, the National Natural Science Foundation, and the Chinese Academy of Sciences Youth Promotion Association.
Figure: a, spin arrangement of magnetic sigmoid and magnetic float; b, data flow composed of magnetic sigmoid and magnetic float as data carrier, and corresponding data storage schematic; c, magnetismer and magnetic float The three-dimensional magnetic configuration in the nanoribbon; d, the magnetic phase corresponding to the magnetic sigma and the magnetic float, the magnetic float has a weak phase contrast, the specific value is shown in Figure e.
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