Wasp-waisted behavior in magnetic hysteresis curves of CoFe2O4 nanopowder at a low temperature: experimental evidence and theoretical approach
Carregando...
Data
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Minas Gerais
Descrição
Tipo
Artigo de periódico
Título alternativo
Primeiro orientador
Membros da banca
Resumo
We theoretically and experimentally investigated wasp-waisted magnetic hysteresis curves at a low
temperature for CoFe2O4 nanopowders. Our theoretical approach proposes a physical mechanism that
leads to wasp-waisted behavior for a single magnetic phase with the same anisotropic field, contrary to
that of typical multi-phase magnetic systems. Our simulations show that a combination of effects,
namely easy-plane anisotropy configuration and dipolar interactions, results in a double peak in the
magnetic susceptibility curve of a granular magnetic system. As experimental evidence of such an effect,
we present a CoFe2O 4 nanopowder and its structural and magnetic characterizations, which support
a single magnetic phase. In addition, the evidence does not corroborate many explanations reported in
the literature for wasp-waisted magnetic behavior. Our results provide evidence for a tetragonal
crystalline phase of CoFe2 O4 due to magneto-elastic coupling, recently reported in the literature.
Abstract
Assunto
Anisotropia, Histerese, Magnetismo
Palavras-chave
Anisotropy, Hysteresis, Wasp, Magnetism
Citação
Departamento
Curso
Endereço externo
https://pubs.rsc.org/en/content/articlelanding/2017/ra/c6ra28727a