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The Center makes strides in skyrmion-based topological spintronics

Date: 2017-03-06
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 Recently, the Center’s  research group headed by Jiang Wanjun systematically studied the dynamic behavior of skyrmion driven by spin current, with the related research results entitled “Direct observation of skyrmion Hall effect”published in Nature Physics. In this study, the Hall effect of topological charge was successfully observed at room temperature using micro-magnetic simulation and MOKE microscope imaging technology. Similar to the Hall effect of the traditional charge in the magnetic field, the study shows that the topological charge is clustered on the side of the sample due to the topological Magnus force, thus showing the macroscopic skyrmion Hall effect. Unlike the chiral bulk material for the Center’s inversion broken-symmetry, this result is achieved using the interface’s inversion symmetry breaking and strong spin-orbit coupling in the low-dimensional artificial magnetic system of nonmagnetic heavy metal / ultrafine ferromagnet / insulator hetero-junction. This work is of instructive significance for understanding the topological quantum transport of skyrmion and the preparation of future prototype topology memory devices.


The Center makes strides in skyrmion-based topological spintronics

Hall effect in which the magnetic field reversal leads to holes (a)-(b); Hall effect for the theoretical prediction of topological charge (c)-(d); experimental observation of the Hall effect of skyrmions (e)-(f).


Since magnetic skyrmions were found in the non-centrosymmetric bulk magnetic material, it has attracted great attention from the field of condensed state physics, especially the field of spin electronics. It has become a research hotspot in the condensed matter physics field to understand the novel topological quantum phenomena, find skyrmions at room temperature, and prepare prototype topology storage devices.

 

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