Modeling hysteresis curves of anisotropic SmCoFeCuZr magnets

• Autor(a) principal: Castro, Nicolau Apoena
• Data de Publicação: 2013
• Outros Autores: Silva, Fernanda A. Sampaio da, Campos, Marcos F. de
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/45498
• topic: Coercivity; Hysteresis; Texture; SmCo; Magnet

The hysteresis curves at room temperature and at 630 K of an anisotropic magnet were successfully modeled with the Stoner–Wohlfarth Callen-Liu-Cullen (SW-CLC) model. This implies that coherent rotation of domains is the reversal mechanism in this magnet. The chemical composition of the evaluated magnet is Sm(CobalFe0.06Cu0.108Zr0.03)7.2. The anisotropy field HA was estimated with the model, resulting m0HA1⁄47.1 T at the room temperature, and 2.9 T at 630 K. For this sample, the CLC interaction parameter (1/d) is very low (near zero) and, thus, the nanocrystalline 2:17 grains are well ‘‘magnetically decoupled’’. The texture analysis using Schulz Pole figure data indicated Mr/Ms ratio1⁄40.96, and this means that the magnet is very well aligned. The excellent alignment of the grains is one of the reasons for the high coercivity of this sample (4 T at room temperature).