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Journal of Electron Microscopy 50:447-455 (2001)
© 2001 Oxford University Press

Paper

Understanding magnetic structures in permanent magnets via in situ Lorentz microscopy, interferometric and non-interferometric phase-reconstructions

Yimei Zhu, Viacheslav V. Volkov and Marc De Graef

Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA

We present our observations of field- and orientation-dependence of magnetic domains and their reversal nucleation at grain boundaries in polycrystalline Nd2Fe14B, using Fresnel– and Foucault–Lorentz microscopy. The local magnetization associated with the domain and domain-wall in Nd2Fe14B and in precipitated Fe particles was mapped using an interferometric holography as well as a novel non-interferometric method based on the ‘transport of intensity’ equation.

Keywords     in situ Fresnel– and Foucault–Lorentz microscopy, induction mapping, electron holography and phase reconstruction, field and orientation dependence and reversal nucleation, Nd2Fe14B


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