Analytical electron microscopy and electron holography on microstructures and magnetic domain structures of Sm-Co 2:17 magnets |
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Authors: | Park Young-Gil Yang Jun-Mo Shindo Daisuke |
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Affiliation: | Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan. park@mail.tagen.tohoku.ac.jp |
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Abstract: | Microstructures and magnetic domain structures of precipitation-hardened Sm-Co permanent magnets were systematically investigated by analytical electron microscopy and electron holography. By an elemental mapping method with energy-dispersive X-ray spectroscopy, the change in the local distribution of additive elements, i.e. Cu, Fe and Zr, in Sm-Co magnets with various heat treatments was visualized and the enrichment of Zr in the Z-phase with a width of approximately 1 nm was clarified directly. Detailed analysis with electron holography revealed that considerable fluctuation in the distribution of lines of magnetic flux in the step-aged magnet was due to the chemical partitioning of additives and resulted in magnetic hardening during the magnetization process. |
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