Title :
Influence of shape demagnetizing effect on piezomagnetic coefficient in magnetostrictive/piezoelectric laminate composite
Author :
Zhiyi Wu ; Yumei Wen ; Ping Li
Author_Institution :
Dept. ofOptoelectronic Eng., Chongqing Univ., Chongqing, China
Abstract :
The piezomagnetic coefficients of different lengths FeNi-FACE plates are tested as a function of magnetic bias field. Taking the shape demagnetizing effect into account, the changing magnetic field (Hch) in the definition of piezomagnetic coefficient (d33) is taken as applied AC magnetic field (Hac) and effective AC magnetic field (Haceff), respectively. When Hch is regarded as Hac, the maximum d33 of different lengths FeNi-FACE plates are increasing with the increase of the rectangular plate´s length. When Hch is taken as Haceff, the maximum d33 of different lengths FeNi-FACE plates are roughly equal, and this result is matching with the theoretical analysis of an analytical model of piezomagnetic coefficient based on the nonlinear constitutive relations of magnetosrictive materials. In order to convert the d33 under the two situations, the concept of a matching factor is proposed. In actually application, the d33 of different shape magnetostrictive materials can be accurately determined by the matching factor.
Keywords :
demagnetisation; iron alloys; laminates; magnetic fields; magnetomechanical effects; nickel alloys; piezoelectric materials; AC magnetic field; FACE plates; FeNi; changing magnetic field; magnetic bias field function; magnetosrictive materials; magnetostrictive-piezoelectric laminate composite; matching factor; nonlinear constitutive relations; piezomagnetic coefficient; rectangular plate length; shape demagnetizing effect; Demagnetization; Magnetic fields; Magnetic resonance; Magnetoelectric effects; Magnetostriction; Materials;
Conference_Titel :
Ultrasonics Symposium (IUS), 2012 IEEE International
Conference_Location :
Dresden
Print_ISBN :
978-1-4673-4561-3
DOI :
10.1109/ULTSYM.2012.0187