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Magnetic and Magnetomechanical Properties of CoAl _{\rm x} Fe _{2 - {\rm x}} O _{4} for Stress Sensor and Actuator Applications

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7 Author(s)
Nlebedim, I.C. ; Wolfson Centre for Magnetics, Cardiff Univ., Cardiff, UK ; Ranvah, N. ; Melikhov, Y. ; Williams, P.I.
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The potential of CoAlxFe2-xO4 (x = 0.1 to 0.9) for magnetomechanical stress sensor applications has been studied. It was found that the plot of magnetostriction against applied magnetic field changed shape as Al content increased. Furthermore, substituting with Al3+ resulted in the increase of the sensitivity of strain to applied magnetic field (dlambda/dH)max. The maximum magnetostriction for the Al-doped (x = 0.1) was 34% lower than un-doped Co-ferrite but the (dlambda/dH)max was 112% higher. The magnitude of magnetostriction obtained for Al-doped samples is still sufficient for stress sensor and actuator applications. Results were compared with those obtained for Ge-, Ga-, Cr- and Mn-doped Co-ferrites. It was found that in terms of improving strain response to applied field whilst maintaining significant amplitude of magnetostriction CoAlxFe2-xO4 has promising potential for magnetomechanical stress sensor applications.

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Magnetics, IEEE Transactions on  (Volume:45 ,  Issue: 10 )