An in situ grown eutectic magnetoelectric composite material

Boomgaard, J. van den; Terrell, D.; Born, R.; Giller, H. F. J. I.

doi:10.1007/bf00540770

Cited by 389 publications

(118 citation statements)

References 6 publications

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“…7 Since then, much effort has been made along this line. For example, Van den Boomgaard et al 8,9 synthesized a bulk composite of CFO ͑cobalt ferrite͒ with BaTiO 3 , but the ME yield was ϳ50 times lower than that predicted theoretically. The CFO-lead-zirconatetitanate ͑PZT͒ multilayered structures prepared by Harshe et al 10 showed an ␣ E ϳ75 mV/cm Oe, which was still much lower than the predicted value.…”

Section: Introductionmentioning

confidence: 95%

Giant magnetoelectric effect of a hybrid of magnetostrictive and piezoelectric composites

Wan

Liu

Chand

et al. 2003

Journal of Applied Physics

131

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A magnetoelectric ͑ME͒ hybrid structure is constructed by an efficient coupling between magnetostrictive Terfenol-D (Tb 0.27-0.30 Dy 0.73-0.70 Fe 1.90-1.95 )/epoxy and piezoelectric leadzirconate-titanate ͓Pb(Zr 0.52 Ti 0.48 )O 3 ͔/epoxy composites. Significant ME effect produced by the piezoelectric k 31 coupling with the longitudinal vibration of the magnetostrictive component over a wide range of frequency is observed. It is revealed that the ME effect can be enhanced by applying an optimized magnetic bias. A magnetoelectric voltage coefficient as high as 8700 mV/cm Oe is recorded at the resonance frequency of 59.2 kHz for the structure with an optimized magnetic bias of 0.7 kOe. Our measurement confirms that the eddy current loss remains negligibly small at an operating frequency as high as ϳ200 kHz, predicting very promising applications of the present ME structure.

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Section: Introductionmentioning

confidence: 95%

Giant magnetoelectric effect of a hybrid of magnetostrictive and piezoelectric composites

Wan

Liu

Chand

et al. 2003

Journal of Applied Physics

131

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“…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.…”

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%

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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“…Such structures when placed in an external ac magnetic field δH undergo deformation of the magnetic layer due to magnetostriction, resulting in an electrical polarization of the dielectric layer due to piezoelectric effect [6,7]. The ac electrical field δE produced in the structure is a "productproperty" and is proportional to the piezomagnetic and piezoelectric coefficients of the constituent phases [8].…”

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confidence: 99%

Structural and magnetoelectric properties of MFe 2 O 4 ?PZT (M?=?Ni,Co) and La x (Ca,Sr) 1-x MnO 3 ?PZT multilayer composites

Srinivasan

Rasmussen

Bush³

et al. 2004

Applied Physics A: Materials Science & Processing

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Thick film layered magnetoelectric composites consisting of ferromagnetic and ferroelectric phases have been synthesized with nickel ferrite (NFO), cobalt ferrite (CFO), La 0.7 Sr 0.3 MnO 3 (LSMO), or La 0.7 Ca 0.3 MnO 3 (LCMO) and lead zirconate titanate (PZT). Structural, magnetic and ferromagnetic resonance characterization shows evidence for defect free ferrites, but deterioration of manganite parameters. The resistivity and dielectric constants are smaller than expected values. The magnetoelectric effect (ME) is stronger in ferrite-PZT than in manganite-PZT. The ME voltage coefficient α E at room temperature is the highest in NFO-PZT and the smallest for LCMO-PZT. The transverse ME effect is an order of magnitude stronger than the longitudinal effect. Multilayer composites consisting of alternative layers of magnetostrictive and piezoelectric materials are observed to show a strong magnetoelectric (ME) effect and are of interest for studies on ME interactions and for potential use in devices [1][2][3][4][5]. Such structures when placed in an external ac magnetic field δH undergo deformation of the magnetic layer due to magnetostriction, resulting in an electrical polarization of the dielectric layer due to piezoelectric effect [6,7]. The ac electrical field δE produced in the structure is a "productproperty" and is proportional to the piezomagnetic and piezoelectric coefficients of the constituent phases [8]. The magnetoelectric voltage coefficient α E = δE/δH for such composites is in the range 50-5000 mV/Oe cm, depending on the nature and volume of the magnetic and piezoelectric phases [1][2][3][4]6,7]. These values far exceed the ME coefficient of 20 mV/Oe cm for Cr 2 O 3, the best single phase ME material [9].Theoretical models for a bilayer with parameters of nickel or cobalt ferrite and lead zirconate titanate predict coefficients as high as 1.5 V/Oe cm [7]. Although our studies reveal strong ME interactions in nickel ferrite -PZT samples, systems such as cobalt ferrite-PZT show a weak coupling [10]. The reason could be deterioration of physical properties of individual layers and poor mechanical coupling between the two phases due to defects at the interface formed during the sample processing [3,4,6]. A detailed and comprehensive investigation of structural, electrical and magnetic properties of the structures is important to elucidate the cause of magnetoelectric coefficient limitations.This report details the fabrication and characterization of multilayer thick film structures consisting of piezoelectric (lead zirconate titanate) and ferromagnetic (nickel ferrite, cobalt ferrite, and lanthanum-strontium or calcium manganite) phases. The choice of materials for the structures is due to the following reasons. All the materials, except the manganites, have ferromagnetic or ferroelectric phase transition temperatures well above the room temperature. Piezoelectric lead zirconate titanate (PZT) has high dielectric permeability and high piezoelectric coupling constants. Both nickel and cobalt fer...

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An in situ grown eutectic magnetoelectric composite material

Cited by 389 publications

References 6 publications

Giant magnetoelectric effect of a hybrid of magnetostrictive and piezoelectric composites

Giant magnetoelectric effect of a hybrid of magnetostrictive and piezoelectric composites

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

Structural and magnetoelectric properties of MFe 2 O 4 ?PZT (M?=?Ni,Co) and La x (Ca,Sr) 1-x MnO 3 ?PZT multilayer composites

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