2024 - Sustainable Industrial Processing Summit
SIPS 2024 Volume 12. Schultz Intl. Symp / Science of Intelligent & Sustainable Materials / Ferromagnetic & Superconducting Magnets
| Editors: | F. Kongoli, J-M. Dubois, M. Calin, S. Kobe |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2024 |
| Pages: | 236 pages |
| ISBN: | 978-1-998384-26-6 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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DETERMINATION OF MAGNETIC ANISOTROPY IN ALNICO, COBALT-NEEDLES AND SmFeN
Marcos de Campos1; Fernanda A Sampaio da Silva1; Kaio ST de Souza1; Charle Correia da Silva2; Ingrid R de Lima1; Jose Adilson de Castro1;1FEDERAL FLUMINENSE UNIVERSITY, Volta Redonda, Brazil; 2UFF, Volta Redonda , Brazil;
Type of Paper: Regular
Id Paper: 517
Topic: 42
Abstract:
It was recently presented a model [1-3] able to predict the magnetic anisotropy of any sample, This is called the "Simultanoeus Fitting Method" SFM.
According the SFM method, the magnetic anisotropy can be determined, since magnetic measurements are performed at the (_|_) perpendicular and (//) parallel directions (relative to the alignment direction). The method assumes samples with alignment in one preferential direction, thus with uniaxial anisotropy. This kind of anisotropy is typically found in samples prepared by powder metallurgy, where the alignbment is obtained by applying magnetic fields in grains with single domain size.
Using the SFM, the crystallographic texture of samples can be determined directly from magnetic measurements, avoiding complicated, laborious and expensive techniques as EBSD - Electron BackSacterred Diffraction.
A symmetrical distribution as for example the Gaussian, is used for describing the crystallographic texture.
Other distribution functions can also be used, since they are symmetrical. This includes Cauchy -Lorentz, Voigt and Pearson VII as possibilities.
It is experimentally found that f=cos(theta)^n or Gaussian distributions describe very well the texture of the samples.
The model allows the re-evaluation of experimental data. Here it is discussed how to apply the model in very different samples.
These samples are SmFeN (magnetocrystalline anisotropy), Alnico, (shape anisotropy [4,5]) and cobalt-needle samples.
In cobalt needle samples the shape anisotropy and the magnetocrystalline anisotropy may have the same order of magnitude.
It is discussed the question of dominant anisotropy.