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Thermal generation, manipulation and thermoelectric detection of skyrmions

Newstime: 2021-03-04 15:23:07

The study of generation, operation and thermoelectric detection of nanoscale Skyrmion from the integrated devices of metal multilayer film and micro heater was conducted by Jiang Wanjun research group in the State Key Laboratory of Low-dimensional Quantum Physics and Quantum Information Frontier Science Center from Tsinghua University.

The achievements was published in Nature Electronics with the title "Thermal Generation, Manipulation and Thermoelectric Detection of Skyrmions"

 

Professor Jiang Wanjun, National key Laboratory of low dimensional Quantum Physics / Quantum Information Frontier Science Center, Department of Physics, Tsinghua University, and Los Alamos National Laboratory Shi-Zeng Lin New Mexico, are co-authors of this paper. The co-first author of the article include Dr. Wang Zidong, Department of Physics, Tsinghua University, Dr. Guo Minghua, Department of Microelectronics, Tsinghua University, postdoctoral Zhou Henan, and Zhao Le, Ph. D., Grade 2018, Department of Physics, Tsinghua University, .

▲Author and abstract


The magnetic skyrmion is a micro-nano-level topological spin structure, its efficient generation, operation and detection are of great significance for the future development of spin electronic devices. By in situ local heating, this study found that the skyrmion can be formed from domain morphology transformation and device edges. The study can observe the unidirectional diffusion of skyrmion from the hot to the cold regions, and show that this is the result of the interaction of the repulsive force between skyrmion, the thermal spin orbital moment, the magnetic oscillator spin moment and the equivalent effect of entropy. The integrated device can also be used to carry out in situ thermoelectric measurements to detect a single skyrmion.

 

The integrated device designed by the research group uses silicon nitride membrane as a substrate which independently developed and produced by YW MEMS (Suzhou) Co., Ltd. The thinnest silicon nitride membrane produced by YW MEMS can be up to 10 nm, with good mechanical strength, high temperature resistance and surface thermal conductivity under the premise of ensuring super smooth and super clean quality requirements.This study makes full use of these excellent features of silicon nitride membrane to do secondary processing on the surface of the film. It makes the membrane metal resistance and perpendicular anisotropic magnetic multilayers, and carry out the experiment of thermally induced generation of skyrmion.

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▲YW MEMS provides the silicon nitride membrane for the experimental part of the study


In addition, YW MEMS provides reliable material parameters of silicon nitride membrane for the simulation work, which makes the simulation results closer to the experimental data.

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▲silicon nitride membrane integrated heating device for skyrmions generation

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▲Experimental process of heat induced skyrmions production


(upper left) Photograph of experimental device and schematic of pulse heat flux application method;

(lower left) Imaging results of rectangular magnetic nanostructures using soft X ray full-field transmission microscope.

With the increase of pulse voltage and the increase of heating temperature in the resistance wire, more skyrmions can be generated from the defects of the sample hot end and topological deformation of striped domains, accompanied by unidirectional diffusion to the cold end. (Right) It is the anomalous Nernst measurements over time, it can be seen that the annihilation of a single skyrmion produces an anomalous Nernst voltage signal of about 90 nV.


Original link: https://www.nature.com/articles/s41928-020-00489-2





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