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Doctoral Thesis
DOI
10.11606/T.43.1998.tde-30082012-153600
Document
Author
Full name
Daniel Reinaldo Cornejo
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1998
Supervisor
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.
 
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45415Cornejo.pdf (5.82 Mbytes)
Publishing Date
2012-08-31
 
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