Analytical electron microscopy and electron holography on microstructures and magnetic domain structures of Sm-Co 2:17 magnets.
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.
Park
Young-Gil
YG
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan. park@mail.tagen.tohoku.ac.jp
Yang
Jun-Mo
JM
Shindo
Daisuke
D
D006696:Holography / Q000379:methods*; D008280:Magnetics; D008670:Metals / Q000737:chemistry*; D008854:Microscopy, Electron / Q000379:methods*; D008962:Models, Theoretical; D014961:X-Ray Diffraction
D008670:Metals