| Budget Amount *help |
¥44,850,000 (Direct Cost: ¥34,500,000、Indirect Cost: ¥10,350,000)
Fiscal Year 2023: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2022: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Fiscal Year 2021: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Fiscal Year 2020: ¥13,130,000 (Direct Cost: ¥10,100,000、Indirect Cost: ¥3,030,000)
Fiscal Year 2019: ¥10,660,000 (Direct Cost: ¥8,200,000、Indirect Cost: ¥2,460,000)
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| Outline of Final Research Achievements |
To visualize three-dimensional (3D) topological spin textures, we developed Lorentz TEM and differential phase contrast (DPC) tomography. We demonstrated new 3D topological structures, such as skyrmion (Sk) strings, (anti)hedgehogs, and 'hopfion' in chiral-lattice magnets. The achievments allowed us to gain insights into 3D spin structures in addition to the 2D topological structures observed thus far. We achieved a spatial and temoral resolutions of less than 5 nm and 10 minutes, respectively, by using the DPC tomography, which significantly enhances the spatial and temporal resolution compared to conventional 3D magnetic imaging techniques.
Using in-situ Lorentz TEM, we generated and visualized for the first time a square lattice of Sks with a diameter of 1.9 nm in GdRu2Si2 at an ultralow temperature (8K), the smallest ever observed in known compounds. We elucidated the dynamic behavior of (anti)Sks by investigating their 'driving dynamics' in response to 'current' and 'heat flow'.
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