&lt;title&gt;Magnetoelectric effect in composite materials&lt;/title&gt;

Harshé, Girish; Dougherty, Joseph P.; Newnham, R. E.

doi:10.1117/12.148414

Cited by 89 publications

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“…Theories predict a maximum in α′ E for the composition with equal amount of ferrite and PZT. Estimates of α′ E based on, for example, cube shaped particles of CoFe 2 O 4 -BaTiO 3 and CoFe 2 O 4 -PZT range from 100 to 500 mV/cm Oe [4]. But the measured values are relatively small mainly due to low composite resistivity.…”

Section: Bulk Compositesmentioning

confidence: 99%

“…The most important inferences from Figs.2 and 3 are the weak ME interactions in bulk composites and the maximum in α′ E for PZT-rich composition. Theories for ME effects in bulk composites are based on specific particle shapes and mechanical connectivity between the two phases [4]. The voltage coefficients are directly proportional to the product of piezomagnetic and piezoelectric constants.…”

Section: Bulk Compositesmentioning

confidence: 99%

“…These problems could be eliminated in a layered structure [4]. Series electrical connectivity gives rise to a high resistivity, negligible leakage current and strong piezoelectric and ME coupling.…”

Section: Introductionmentioning

confidence: 99%

“…Composites of interest in the past were bulk samples of nickel ferrite or cobalt ferrite with BaTiO 3 or lead zirconate titanate (PZT) [ 3,4]. Powders of the two oxides are mixed and sintered.…”

Section: Introductionmentioning

confidence: 99%

“…The (static) effect, first observed in antiferromagnetic Cr 2 O 3, is weak in single-phase compounds [2]. But a composite of piezomagnetic-piezoelectric phases is also expected to be magnetoelectric since α = δP/δH is a "product-property" that results from magnetostriction induced deformation and piezoelectric charge generation [3][4][5]. We are interested in the dynamic ME effect; for an ac magnetic field δH applied to a biased composite, one measures the induced voltage δV.…”

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Dynamic magnetoelectric effects in bulk and layered composites of cobalt zinc ferrite and lead zirconate titanate

et al. 2005

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Low frequency magnetoelectric (ME) coupling has been investigated in bulk and multilayers of cobalt zinc ferrite, Co 1-x Zn x Fe 2 O 4 (x=0-0.6), and lead zirconate titanate. In bulk samples, the transverse and longitudinal couplings are weak and are of equal magnitude. A substantial strengthening of ME interactions is evident in layered structures, with the ME voltage coefficient a factor of 10-30 higher than in bulk samples. Important findings of the studies in layered composites are as follows. (i) The transverse coupling is stronger than the longitudinal coupling. (ii) The strength of ME interactions is dependent on Zn substitution with a maximum for x=0.4. (iii) Analysis of volume and static magnetic field dependence of ME voltage coefficients reveal a weak coupling at the ferromagnetic-piezoelectric interface. (iv) The interface coupling k increases with Zn substitution and k versus x profile shows a maximum centered at x=0.4. (iv) The Zn-assisted enhancement is attributed to efficient magneto-mechanical coupling in the ferrite.PACS IntroductionIn a magnetoelectric (ME) material, an applied magnetic field produces a dielectric polarization or an external electric field results in an induced magnetization [1]. The induced polarization P is related to the magnetic field H by P = α H, where α is the ME-susceptibility. For a single-phase material to be magnetoelectric, one requires a long-range magnetic order and the presence of permanent electric dipoles. The (static) effect, first observed in antiferromagnetic Cr 2 O 3, is weak in single-phase compounds [2]. But a composite of piezomagnetic-piezoelectric phases is also expected to be magnetoelectric since α = δP/δH is a "product-property" that results from magnetostriction induced deformation and piezoelectric charge generation [3][4][5]. We are interested in the dynamic ME effect; for an ac magnetic field δH applied to a biased composite, one measures the induced voltage δV. The ME voltage coefficient α′ E = δV/t′δH and is related to the ME susceptibility through α = ε o ε r α′ E where t′ is the composite thickness and ε r is the relative permittivity.This report is concerned with the synthesis of bulk and layered composites of ferromagneticferroelectric oxides and studies on the nature of magnetoelectric interactions. Composites of interest in the past were bulk samples of nickel ferrite or cobalt ferrite with BaTiO 3 or lead zirconate titanate (PZT) [ 3,4]. Powders of the two oxides are mixed

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Section: Bulk Compositesmentioning

confidence: 99%

Section: Bulk Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Dynamic magnetoelectric effects in bulk and layered composites of cobalt zinc ferrite and lead zirconate titanate

et al. 2005

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Magnetoelectric Coupling Effects in Multiferroic Complex Oxide Composite Structures

et al. 2010

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The study of magnetoelectric materials has recently received renewed interest, in large part stimulated by breakthroughs in the controlled growth of complex materials and by the search for novel materials with functionalities suitable for next generation electronic devices. In this Progress Report, we present an overview of recent developments in the field, with emphasis on magnetoelectric coupling effects in complex oxide multiferroic composite materials.

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Measuring the magnetoelectric effect across scales

et al. 2015

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Magnetoelectric coupling is the material based coupling between electric and magnetic fields without recurrence to electrodynamics. It can arise in intrinsic multiferroics as well as in composites. Intrinsic multiferroics rely on atomistic coupling mechanisms, or coupled crystallographic order parameters, and even more complex mechanisms. They typically require operating temperatures much below T = 0°C in order to exhibit their coupling effects. Room temperature applications are thus excluded. Consequently, composites have been designed to circumvent this limitation. They rely on field coupling between magnetostrictive and piezoelectric materials or in more advanced scenarios on quantum coupling in between both phases.This overview will describe experimental techniques and their particular limitations in accessing these coupling phenomena at different scales. Strain coupling is the dominant coupling mechanism at the macroscale as well as down to the micrometer. At the nanoscale more subtle effects can arise and some care has to be taken when investigating local coupling at interfaces using scanning probe techniques, e. g. due to semiconductor effects, field screening, or gradient and surface effects. At the smallest length scale atomic or molecular coupling can be tested using X‐ray dichroism or probe atoms like 57Fe in Mössbauer spectroscopy. We display a selection of measuring techniques at the different scales and outline possible pitfalls for experimentalists as well as theoreticians when using material parameters extracted from such experimental work. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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<title>Magnetoelectric effect in composite materials</title>

Cited by 89 publications

References 0 publications

Dynamic magnetoelectric effects in bulk and layered composites of cobalt zinc ferrite and lead zirconate titanate

Dynamic magnetoelectric effects in bulk and layered composites of cobalt zinc ferrite and lead zirconate titanate

Magnetoelectric Coupling Effects in Multiferroic Complex Oxide Composite Structures

Measuring the magnetoelectric effect across scales

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