Transformation between different topological spin textures — ScienceDaily

Skyrmions and bimerons are basic topological spin textures in magnetic thin films with asymmetric exchange interactions and they can be used as information carriers for next-generation low-energy consumption memory, advanced neuromorphic computing, and advanced quantum computing because they have several degrees of freedom that can be carried. information. The transformation between isolated skyrmions and bimerons will be an important operation for future computing architectures based on several different topological bits. Therefore, it is important for society to find effective ways to create, transform, and manipulate skyrmions and bimerons in magnetic materials.

In a recent study published in Nano Letter, a group led by Xiaoxi Liu, Professor in the Department of Electronics and Computer Engineering at Shinshu University in Japan and their international collaborators demonstrate in experiments and simulations that the creation of isolated skyrmions and their subsequent transformation to bimerons is possible in a surrounded magnetic disk. by current-carrying and omega-shaped microcoils, where electric current-induced Oersted fields and temperature-induced perpendicular magnetic anisotropy variations play an important role in the transformation between skyrmions and bimerons. Researchers found that the current injected into the microcoil can generate an Oersted field when the magnetization of the magnetic disk moves in the out-of-plane direction. Meanwhile, the current injected into the microcoil can heat the magnetic disk and result in an increase in the temperature of the device. As a result, the temperature-induced reduction of the magnetic anisotropy is realized in the magnetic disk, which causes the reorientation of magnetization from the out-of-plane direction to the in-plane direction and thus, fosters the transformation from skyrmions to bimerons. The researchers also found defective skyrmion bubbles and chiral labyrinth domains during the transformation between skyrmions and bimerons.

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The researcher’s results show the possibility that two different types of topological spin textures can be hosted by the same magnetic film with asymmetric exchange interactions, which can provide guidelines for building novel spintronic applications based on different types of topological spin textures.

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“Our experiments clarify for the first time the transformation between different topological spin textures,” explained Liu. He also said, “Skyrmions and bimerons are two of the most important information carriers for next-generation memory and advanced computing architectures. Our research has fundamental physical interests. It is also important for data storage and future computing communities.”

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The researcher will try to study the application of magnetic and spintronic devices based on the transformation of different types of topological spin textures. An example is a voltage-gated spintronic device based on skyrmions and bimerons. “Our ultimate goal is the application of topological spin textures for low energy consumption, high density memory and advanced neuromorphic computing.” Liu said.

This research is mainly supported by JSPS KAKENHI (Grant No. JP20F20363, JP21H01364, JP21K18872, and JP22F22061).

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Materials provided by Shinshu University. Note: Content may be edited for style and length.

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