Theoretical analysis of the intrinsic magnetic noise spectral density of magnetostrictive-piezoelectric laminated composites

Xin Zhuang (1) , Christophe Cordier (1) , Sébastien Saez (1) , Marc Lam Chok Sing (1) , Christophe Dolabdjian (1) , J. Gao (2) , J-F. Li (2) , D. Viehlang (2)

1 Equipe Electronique - Laboratoire GREYC - UMR6072
2 MSE - Department of Materials Science and Engineering [Blacksburg]

The equivalent magnetic noise spectral density level for long type magnetostrictive-piezoelectric laminated composites has been investigated by using a 1D equivalent circuit model, and exemplified for a longitudinal-transverse mode. The theoretical developments explain well our experimental results. The findings show that similar ultimate magnetic noise spectral noise density can be expected whether using either charge or voltage amplifier detection methods. The findings show that a volume effect and the dielectric loss factor of the piezoelectric layer are the dominant sources of the noise floor. Our findings show that the noise scales as 1/Hf. The lowest equivalent noise floor value that has been observed is 10/Hf pT/HHz for f 10 kHz, with a white noise level of 100 fT/HHz above 10 kHz

Domaines: Sciences de l'ingénieur [physics]; Electromagnétisme

Xin Zhuang, Christophe Cordier, Sébastien Saez, Marc Lam Chok Sing, Christophe Dolabdjian, et al.. Theoretical analysis of the intrinsic magnetic noise spectral density of magnetostrictive-piezoelectric laminated composites. Journal of Applied Physics, 2011, 109 (12), pp.124512 - 124512-10. ⟨10.1063/1.3594714⟩. ⟨hal-00986977⟩