The temperature-dependent values of the remnant polarization, maximum polarization, coercive field, bipolar and unipolar strain, as well as the shape change of P E and S E curves have been comparatively investigated and discussed.
Remanent polarization [Pr], maximum polarization [Pmax], coercive field [Ec], maximum field [Emax], and loop squareness [Rsq] values were evaluated from the loops.
εr, dielectric constant; tanδ, loss tangent; Pr, remanent polarization; Pmax, maximum polarization; Ec, coercive field; Emax, maximum field; Rsq, loop squareness.
The maximum measured shift in coercive field exceed 200 Oe for 10 ns pulse.
In the MPB composition, the maximum polarization, remnant polarization, coercive field and piezoelectric coefficient are 46.4 μC/cm2, 39.2 μC/cm2, 4.8 kV/mm and 95 pC/N, respectively.
These high values of coercive field and maximum energy product may insure the basic requirement of designing rare-earth free permanent magnets.
The effect of structure on ferroelectricity has been studied through polarization-electric field hysteresis loop confirming greater maximum polarization, remnant polarization and coercive field for nanohybrid against pure HFP.
A value of the coercive field close to the maximum reduction can be achieved for soft layers that are thicker than lh where lh2="2π2As/Kh,As is the exchange constant in the soft layer and Kh the anisotropy constant of the hard layer.
When the particle size is reduced, the coercive field increases, passing through a maximum and then decreasing again.
