Magnetic After-Effects in Barium Hexagonal Ferrites with BaO·6Fe<sub>2</sub>O<sub>3</sub> (M-Type) Stoichiometry

  1. Hernández-Gomez, P. 1
  2. Hisatake, K. 2
  3. Francisco, C. de 1
  4. Muñoz, J. M. 1
  5. Alejos, O. 1
  6. Torres, C. 1
  7. Matsubara, I. 2
  1. 1 Universidad de Valladolid
    info

    Universidad de Valladolid

    Valladolid, España

    ROR https://ror.org/01fvbaw18

  2. 2 Kanagawa Dental University
    info

    Kanagawa Dental University

    Yokosuka, Japón

    ROR https://ror.org/0514c4d93

Revista:
Journal of the Magnetics Society of Japan

ISSN: 0285-0192,  1880-4004

Any de publicació: 1999

Volum: 23

Número: 12

Pàgines: 2134-2139

Tipus: Article

DOI: 10.3379/JMSJMAG.23.2134 GOOGLE SCHOLAR lock_openAccés obert editor

Altres publicacions en: Journal of the Magnetics Society of Japan

Resum

The time decay of the relative initial magnetic susceptibility after sample demagnetization was measured in the temperature range 80 K < T < 420 K in series of samples with initial composition BaO·6Fe2O3, that is, the stoichiometric M-type barium ferrites. These samples were sintered under various conditions of temperature and partial oxygen pressure. The results were represented by means of isochronal curves. We observed that the behavior varies drastically according to the sintering atmosphere. The underlying mechanisms responsible for the relaxation phenomena observed are pointed out in terms of the formation of different hexagonal phases and the existence of ferrous cations within the hexagonal structure.

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