Study of the Curie temperature of cobalt ferrite based composites for stress sensor applications

• Published in: IEEE transactions on magnetics 2003-09, Vol.39 (5), p.3316-3318
• Main Authors: Paulsen, J.A., Lo, C.C.H., Snyder, J.E., Ring, A.P., Jones, L.L., Jiles, D.C.
• Format: Article
• Language: English
• Subjects: Cobalt; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Ferrimagnetics; Ferrites; Instruments for strain, force and torque; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Magnetic field induced strain; Magnetic hysteresis; Magnetic materials; Magnetic properties and materials; Magnetic sensors; Magnetism; Magnetomechanical effects; Mechanical instruments, equipment and techniques; Physics; Stress; Studies of specific magnetic materials; Temperature dependence; Temperature sensors
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2003.816761

Cobalt ferrite has been shown to be an excellent candidate material for high sensitivity magnetic stress sensors due to its large magnetomechanical effect and high sensitivity to strain. However, near room temperature, the material exhibits some magnetomechanical hysteresis, which becomes negligible for temperatures of 60/spl deg/C and above. Measurements indicate that doping the cobalt ferrite with silicon lowers the Curie temperature of the material. It was also found that the Curie temperature of the material depends on the fabrication and processing procedure. These results offer the possibility of decreasing the room temperature magnetomechanical hysteresis through control of the Curie temperature, thereby altering the temperature dependence of magnetic and magnetomechanical properties.