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Nucleation regions and coercivity determination of sintered Nd-Fe-B magnets

Lookup NU author(s): Muhsien Yazid, Dr Sarah Olsen, Dr Glynn Atkinson

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Abstract

© 2016 School of Mechanical and Systems Engineering. This paper describes the use of magnetic force microscopy MFM to observe magnetization reversal and nucleation in sintered permanent magnet materials. The investigated magnet is sintered Nd-Fe-B magnet. The domain structure is observed in both perpendicular and parallel surfaces to the alignment axis (easy axis) in a thermally demagnetized state. Maze-like and stripe-like magnetic domains are observed in perpendicular and parallel surfaces respectively. The nucleation regions are successfully observed at domain walls and presented in 3D with clear magnetic contrast images. The sample shows narrow magnetic domains with negative nucleation regions. The volume of nucleation site are determined and validated theoretically by developing an approach involving coercivity versus nucleus volume. It is shown that nucleation volume is proportional to coercive field. These insights can be useful for realizing Dy free Nd-Fe-B magnet with high coercivity.


Publication metadata

Author(s): Yazid MM, Olsen SH, Atkinson G

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 2016 International Conference for Students on Applied Engineering, ICSAE 2016

Year of Conference: 2017

Pages: 340-344

Online publication date: 09/01/2017

Acceptance date: 02/04/2016

Publisher: Institute of Electrical and Electronics Engineers Inc.

URL: https://doi.org/10.1109/ICSAE.2016.7810214

DOI: 10.1109/ICSAE.2016.7810214

Library holdings: Search Newcastle University Library for this item

ISBN: 9781467390538


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