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High magnetostrictive doped cobalt ferrite

O. CALTUN1,* , H. CHIRIAC2, N. LUPU2, I. DUMITRU1, B. PARVATHEESWARA RAO3

Affiliation

  1. Faculty of Physics, A.I. Cuza University, Iasi, 700506 Romania
  2. The National Institute of R&D for Technical Physics, Iasi, 700050, Romania
  3. Department of Physics, Andhra University, Visakhapatnam 530003, India

Abstract

Manganese substituted cobalt ferrites have been shown to be promising candidate materials for stress and torsion sensor applications. In our study was investigated the influence of the manganese substitution on the magnetostrictive coefficient of ferrite samples with compositions of CoFe2-xMnxO4, where x ranges from 0 to 0.6. The samples were sintered for 5 hours in air at 1180 °C followed by natural cooling. The X ray analysis proves the existence of the spinel structure. Saturation magnetization, Curie temperature and magnetostriction measurements were performed on the samples to determine the influence of the substitution. The substitution of manganese for iron can decrease the Curie temperature and consequently the temperature of magnetomechanical effect. By modifying the manganese content and the sintering process, the material properties could be optimized for use in magnetomechanical stress sensors..

Keywords

Co ferrite, Magnetostriction, Curie temperature, Magnetomechanical hysteresis, Sensors.

Submitted at: Jan. 25, 2007
Accepted at: April 15, 2007

Citation

O. CALTUN, H. CHIRIAC, N. LUPU, I. DUMITRU, B. PARVATHEESWARA RAO, High magnetostrictive doped cobalt ferrite, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 4, pp. 1158-1160 (2007)