Relation between Initial Magnetization Curve and Grain Size of Nanocrystalline NdFeB Magnets

Marcos Flavio de Campos; Fernanda A.S. da Silva; José Adilson de Castro

doi:10.4028/www.scientific.net/MSF.802.558

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HomeMaterials Science ForumMaterials Science Forum Vol. 802Relation between Initial Magnetization Curve and...

Relation between Initial Magnetization Curve and Grain Size of Nanocrystalline NdFeB Magnets

Abstract:

The volume fraction of the single domain size particles can be directly estimated from the initial magnetization of thermally demagnetized magnets. Multi-domain grains present initial magnetization curve with high initial susceptibility, whereas single-domain grains present low susceptibility initial magnetization curve. In the case of single domain size particles, the coercivity mechanism is coherent rotation and the Stoner-Wohlfarth (SW) model can be applied. From the initial magnetization curve of magnets, the volume fraction of grains with diameter less than 0.3 micrometers can be estimated in NdFeB magnets. This is possible because the Nd₂Fe₁₄B phase is single domain below 0.3 micrometers.

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Periodical:

Materials Science Forum (Volume 802)

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558-562

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.802.558

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Online since:

December 2014

Authors:

Marcos Flavio de Campos*, Fernanda A.S. da Silva, José Adilson de Castro

Keywords:

Coercivity, Hysteresis, Magnets, NdFeB

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