The broadband magneto-electric energy conversion by the NiMnGa single crystal/piezoceramic system
|Mykola M. Krupa 2, Volodymyr A. Chernenko 2, Victoria Karasiova 2, Stefano Besseghini 1|
1. Istituto per l'Energetica e le Interfasi Consiglio Nazionale delle Ricerche Unità di Lecco (IENI Lecco), Corso Promessi Sposi, 29, Lecco 23900, Italy
Measurements of the magnetostrictive characteristics of NiMnGa martensitic single crystal have been carried out under low alternating magnetic field in a range of 0 - 20 MHz.A longitudinal magnetostriction appeared to be 2-3 times higher than that for pure polycrystalline Ni and its amplitude increases at high dc magnetic field.
The transverse magnetostriction is found to be dependent on the orientation of the alternate magnetic field and crystallographic directions. This magnetostriction along two long crystallographic axes is essentially higher than that for pure Ni in one-variant state of martensitic single crystal. Its magnitude inreases drastically in two-variant state.
The magnetic-to-electric conversion efficiency in the Ni-Mn-Ga/piezoceramic system was found 0.001-0.01 V/Oe in frequency range of 0 - 20 MHz.
Presentation: poster at E-MRS Fall Meeting 2005, Symposium C, by Mykola M. Krupa
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-05-20 16:03 Revised: 2009-06-07 00:44