Temperature Dependence of Magnetostriction of for Magnetostrictive Sensor and Actuator Applications

The temperature dependence of the magnetoelastic properties of a series of germanium/cobalt co-substituted cobalt ferrite samples has been measured. Magnetostriction loops of the compositions Co 1+x Ge x Fe 2-2x O 4 (x = 0.1 , 0.3, and 0.6) were measured over a temperature range of 250-400 K. German...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2008-11, Vol.44 (11), p.3013-3016
Main Authors: Ranvah, N., Nlebedim, I.C., Melikhov, Y., Snyder, J.E., Jiles, D.C., Moses, A.J., Williams, P.I., Anayi, F., Sang-Hoon Song
Format: Article
Language:English
Subjects:
Cobalt
Cobalt ferrite
Ferrites
Germanium
germanium substitution
Iron
Magnetic properties
Magnetism
Magnetostriction
stress sensor
Temperature dependence
Temperature distribution
Temperature measurement
Temperature sensors
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Summary:The temperature dependence of the magnetoelastic properties of a series of germanium/cobalt co-substituted cobalt ferrite samples has been measured. Magnetostriction loops of the compositions Co 1+x Ge x Fe 2-2x O 4 (x = 0.1 , 0.3, and 0.6) were measured over a temperature range of 250-400 K. Germanium/cobalt co-substitution was found to change the Curie temperature, anisotropy, and the magnetostriction coefficients in the crystal directions of [100] and [111]. Both magnetostriction and strain sensitivity were seen to decrease in magnitude with increasing temperature. Co 1.1 Ge 0.1 Fe 1.8 O 4 was found to have a maximum sensitivity (dlambda/dH) sigma of 2.6 times 10 -9 A -1 .m, which is twice the value obtained for pure cobalt ferrite, without any decrease in maximum magnetostriction in the linear region.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2008.2004535