In general, the behavior of magnetostrictive materials is described by the piezomagnetic equation.
[d.sub.33] and [d.sup.*.sub.33] are the piezomagnetic and inverse piezomagnetic coefficients, respectively; they are defined as [d.sub.33] = de/dH and [d.sup.*.sub.33] = [partial derivative]B/[partial derivative]H.
The advantage of a matriciant method is that it equally describes the wave propagation in the presence of one or several physical effects, such as thermoelastic, magnetoelastic, and piezoelastic and magnetoelectric, piezomagnetic
, and magnetoelectric effects.
Therefore, a new dynamic model including load, disc spring stiffness, and friction is established based on combination of minor loops J-A model of GMM, structural dynamic equation of GMA, Ampere circuit law, and nonlinear piezomagnetic equation through analyzing the working principle of GMA.
The quadratic magnetic domain rotation model is introduced into the linear piezomagnetic equation .
In most ME candidate materials the ME effect is produced through strain-coupling of a ferroelastic-ferroelectric phase with a magnetoelastic phase [6, 7] (for example, bonding together thin layers of piezoelectric and piezomagnetic films).
Rather, the coupling of the mechanical and electromagnetic properties through piezoelectric and piezomagnetic phenomena cause a hybridizing of the "base" modes of the system, causing a shift in the phase velocities and "mixing" of eigenmodes of the system, depending of course upon the particular combination of material parameters associated with the system.
Jaffe, Piezoelectric and Piezomagnetic
Materials and Their Function in Transducers.
The high [[mu].sub.r] of FeBSiC results in a small demagnetization field in the surface plane, enabling a high effective piezomagnetic
coefficient at low biases (~ 70 Oe), which made the laminate exhibit a large ME response at quite low [H.sub.dc].
Investigation of generation mechanism of the seismoelectromagnetic signals (SES) (e.g., [36, 49]) in the field indicates that the dominant mechanism is the electrokinetic effect compared with the piezomagnetic
, piezoelectric, nonclassical piezoelectric, and induction effects .
Now common in new engineering structures, especially in smart materials and intelligent components, the emerging field of magnetostriction has developed in both single phase materials with electric and magnetic ordering and also in two-phase composites where participating phases are piezoelectric and piezomagnetic
. The authors (all engineering, U.
Stress and magnetics are linked through a process called the piezomagnetic
effect, whereby stress can reorganize the magnetic structure inherent in certain minerals such as magnetite.