Aplicação do Modelo de Preisach em Ímãs Nanocristalinos

Cornejo, Daniel Reinaldo

doi:10.11606/T.43.1998.tde-30082012-153600

Home

Facilities

Doctoral Thesis

DOI

https://doi.org/10.11606/T.43.1998.tde-30082012-153600

Document

Doctoral Thesis

Author

Cornejo, Daniel Reinaldo (Catálogo USP)

Full name

Daniel Reinaldo Cornejo

E-mail

Institute/School/College

Instituto de Física

Knowledge Area

Solid-State Physics

Date of Defense

1998-05-28

Published

São Paulo, 1998

Supervisor

Missell, Frank Patrick (Catálogo USP)

Committee

Missell, Frank Patrick (President)
Becerra, Carlos Castilla
Cardoso, Jose Roberto
Guimarães Filho, Alberto Passos
Landgraf, Fernando Jose Gomes

Title in Portuguese

Aplicação do Modelo de Preisach em Ímãs Nanocristalinos

Keywords in Portuguese

Efeito exchang-spring
Imãs nanoestruturados
Modelagem de histerese
Modelo de Preisach

Abstract in Portuguese

Estudamos propriedades magnéticas de ligas nano cristalinas de Sm-F e-Co. As ligas foram preparadas por mecano-síntese e posterior tratamento térmico. Como resultado, obtivemos ímãs nanocristalinos de Sm18 (Fe,Co)82 , com Sm(Fe,Co)7 como fase principal. As ligas apresentaram excelentes propriedades magnéticas: remanências relativas Mn/ Ms ~ 0.6 e coercividades na faixa 5-20 kOe, dependendo do teor de Fe nos materiais. Interações magnéticas nas ligas foram estudadas com base nos gráficos ele Henkel. Interpretamos, nestes gráficos, de maneira consistente a influência elas interações e dos estados desmagnetizados.

Title in English

Application of Preisach model in nanocrystalline magnets

Keywords in English

Exchange-spring behavior
Modeling of hysteresis
Nanostructures magnets
Preisach model

Abstract in English

We studied the magnetic properties of nanocrystalline Sm-Fe-Co alloys. These alloys were prepared by mechanical alloying and subsequent annealing. We obtained nanocrystalline rnagnets of composition Sm18 (Fe, Co )82 , for which the main hard magnetic phase is Sm(Fe, Co)82. The alloys showed excellent magnetic properties: relative remanence Mn/ Ms :2; 0.6 and coercive fields ranging from 5 to 20 k0e, depending upon the amount of Fe present. Henkel plots were used in order to study magnetic interactions in these alloys. The influence of the interactions and the demagnetized state on the Henkel plots was also studied.

WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.

45415Cornejo.pdf (5.82 Mbytes)

Publishing Date

2012-08-31

Derived works

WARNING: Learn what derived works are clicking here.