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COOLING FIELD EFFECT ON EXCHANGE BIAS IN NiO / NiFe2O4 BILAYERS

B. Negulescu1,2,* , L. Thomas1, M. Guyot1, C. Papusoi2

Affiliation

  1. Laboratoire de Magnétisme et d’Optique de Versailles, UVSQ, 45 Avenue des Etats Unis, 78035 Versailles Cedex, France
  2. Department of Electricity and Physical Electronics, Faculty of Physics, “Al. I. Cuza” Univ., 11 Blvd. Carol 1, 6600, Iasi, Romania

Abstract

We have studied the exchange anisotropy in NiFe2O4 / NiO bilayers as a function of the cooling field strength. An unexpected strong variation of the bias upon the cooling field value is observed. Maximum exchange bias fields are observed after cooling in 80 kA/m field. Larger cooling fields induce small, but more stable exchange bias fields. The exchange bias value can be directly correlated with the NiFe2O4 layer’s magnetic state during the field cool procedure..

Keywords

Exchange bias, Magnetic oxides, Pulsed laser deposition, Training effect.

Submitted at: April 26, 2004
Accepted at: June 10, 2004

Citation

B. Negulescu, L. Thomas, M. Guyot, C. Papusoi, COOLING FIELD EFFECT ON EXCHANGE BIAS IN NiO / NiFe2O4 BILAYERS, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 2, pp. 719-722 (2004)