46 research outputs found
Resonance magnetoelectric effects in layered magnetostrictive-piezoelectric composites
Magnetoelectric interactions in bilayers of magnetostrictive and
piezoelectric phases are mediated by mechanical deformation. Here we discuss
the theory and companion data for magnetoelectric (ME) coupling at
electromechanical resonance (EMR) in a ferrite-lead zirconate titanate (PZT)
bilayer. Estimated ME voltage coefficient versus frequency profiles for nickel,
cobalt, or lithium ferrite and PZT reveal a giant ME effect at EMR with the
highest coupling expected for cobalt ferrite-PZT. Measurements of resonance ME
coupling have been carried out on layered and bulk composites of nickel
ferrite-PZT. We observe a factor of 40-600 increase in ME voltage coefficient
at EMR compared to low frequency values. Theoretical ME voltage coefficients
versus frequency profiles are in excellent agreement with data. The resonance
ME effect is therefore a novel tool for enhancing the field conversion
efficiency in the composites
Restructuring of colloidal aggregates in shear flow: Coupling interparticle contact models with Stokesian dynamics
A method to couple interparticle contact models with Stokesian dynamics (SD)
is introduced to simulate colloidal aggregates under flow conditions. The
contact model mimics both the elastic and plastic behavior of the cohesive
connections between particles within clusters. Owing to this, clusters can
maintain their structures under low stress while restructuring or even breakage
may occur under sufficiently high stress conditions. SD is an efficient method
to deal with the long-ranged and many-body nature of hydrodynamic interactions
for low Reynolds number flows. By using such a coupled model, the restructuring
of colloidal aggregates under stepwise increasing shear flows was studied.
Irreversible compaction occurs due to the increase of hydrodynamic stress on
clusters. Results show that the greater part of the fractal clusters are
compacted to rod-shaped packed structures, while the others show isotropic
compaction.Comment: A simulation movie be found at
http://www-levich.engr.ccny.cuny.edu/~seto/sites/colloidal_aggregates_shearflow.htm
Theory of low frequency magnetoelectric coupling in magnetostrictive-piezoelectric bilayers
A theoretical model is presented for low-frequency magnetoelectric (ME)
effects in bilayers of magnetostrictive and piezoelectric phases. A novel
approach, the introduction of an interface coupling parameter k, is proposed
for the consideration of actual boundary conditions at the interface. An
averaging method is used to estimate effective material parameters. Expressions
for ME voltage coefficients are obtained by solving elastostatic and
electrostatic equations. We consider both unclamped and rigidly clamped
bilayers and three different field orientations of importance: (i) longitudinal
fields in which the poling field, bias field and ac fields are all parallel to
each other and perpendicular to the sample plane; (ii) transverse fields for
magnetic fields parallel to each other and perpendicular to electric fields,
and (iii) in-plane longitudinal fields for all the fields parallel to each
other and to the sample plane. The theory predicts a giant ME coupling for
bilayers with cobalt ferrite (CFO), nickel ferrite (NFO), or lanthanum
strontium manganite (LSMO) for the magnetostrictive phase and barium titanate
(BTO) or lead zirconate titanate (PZT) for the piezoelectric phase.Comment: To be published in Physical Review B, August 1, 200