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 ∼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.
Original language | English |
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Pages (from-to) | 267-270 |
Number of pages | 4 |
Journal | Journal of Electron Microscopy |
Volume | 53 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2004 Aug 11 |
Keywords
- EDS elemental mapping
- Electron holography
- Lines of magnetic flux
- Lorentz microscopy
- Sm-Co magnet
ASJC Scopus subject areas
- Instrumentation