2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 3: Takano Intl. Symp. / Metals & Alloys Processing
| Editors: | Kongoli F, Noldin JH, Mourao MB, Tschiptschin AP, D'Abreu JC |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 550 pages |
| ISBN: | 978-1-987820-26-3 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Hysteresis Modeling of NdFeB Magnets and Thin Films
Marcos de Campos1; Jose Adilson de Castro1;1UFF - FEDERAL FLUMINENSE UNIVERSITY, Volta Redonda, Brazil;
Type of Paper: Regular
Id Paper: 187
Topic: 3
Abstract:
A very important application of magnetic materials is on the thin films for magnetic recording. Miniaturization requires phases with high crystalline anisotropy as PtFe, PtCo or Nd2Fe14B. Perpendicular magnetic recording (PMR) with textured thin films are among the possibilities for improving the areal recording density. The relationship between magnetic properties and nanostructures can be studied with the Stoner-Wohlfarth model, which predicts that a sharp (00l) texture can result in improved squareness of the hysteresis loop.
Texture effects in hard nanocrystalline materials or thin films can be evaluated with the Stoner-Wohlfarth (SW) model, since the particles are single domain size and non-interacting. The texture can be introduced in the SW hysteresis by means of an experimental distribution measured by X-Ray diffraction, or theoretically by using distribution functions as Gaussian, Cauchy or Pearson VII. Any symmetrical distribution function can be used for uniaxial texture description, since it represents well the experimental texture data.