Erratum: Magnetoelectric effects in bilayers and multilayers of magnetostrictive and piezoelectric perovskite oxides [Phys. Rev. B<b>65</b>, 134402 (2002)]

Srinivasan, G.; Rasmussen, Ebbe; Levin, B. J.; Hayes, R.W.

doi:10.1103/physrevb.66.029901

Cited by 97 publications

(142 citation statements)

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“…It is noteworthy that the dramatic increase in ρ occurs for v>0. 6, that coincides with the expected percolation limit for the ferrite in PZT. A similar behavior was evident for the piezoelectric coupling constant d 33 .…”

Section: Bulk Compositesmentioning

confidence: 60%

“…The data show strong ME coupling in layered CZFO-PZT. For comparison, the highest value for α′ E is 30 mV/cm Oe in bilayers of lanthanum manganites-PZT, 200 mV/cm Oe for NFO-PZT and 4680 mV/cm Oe for Terfenol-PZT [5,6,14].…”

Section: Layered Compositesmentioning

confidence: 99%

“…Series electrical connectivity gives rise to a high resistivity, negligible leakage current and strong piezoelectric and ME coupling. Significant developments in this regard are the recent observation of giant ME effects in bilayers and multilayers of lanthanum manganite-PZT and nickel ferrite-PZT [5][6][7][8].…”

Section: Introductionmentioning

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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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: 60%

Section: Layered Compositesmentioning

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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“…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].…”

Section: Introductionmentioning

confidence: 99%

“…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].…”

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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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Demonstration of Low Work Function Perovskite SrVO₃ Using Thermionic Electron Emission

Lin

Jacobs

Chen

et al. 2022

Adv Funct Materials

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Engineering a material's work function is of central importance for many technologies and in particular electron emitters used in high‐power vacuum electronics and thermionic energy converters. A low work function surface is typically achieved through unstable surface functional species, especially in high power thermionic electron emitter applications. Discovering and engineering new materials with intrinsic, stable low work functions obtainable without volatile surface species would mark a definitive advancement in the design of electron emitters. This work reports evidence for the existence of a low work function surface on a bulk, monolithic, electrically conductive perovskite oxide: SrVO3. After considering the patch field effect on the heterogeneous emitting surface of the bulk polycrystalline samples, this study suggests the presence of low work function (≈2 eV) emissive grains on SrVO3 surface. Emission current densities of 10–100 mA cm–2 at ≈1000 °C, comparable to commercial LaB6 thermionic cathodes, indicative of an overall effective thermionic work function of 2.3–2.7 eV are obtained. This study demonstrates that perovskites like SrVO3 may have intrinsically low work functions comparable to commercialized W‐based dispenser cathodes and suggests that, with further engineering, perovskites may represent a new class of low work function electron emitters.

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Erratum: Magnetoelectric effects in bilayers and multilayers of magnetostrictive and piezoelectric perovskite oxides [Phys. Rev. B65, 134402 (2002)]

Cited by 97 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

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

Demonstration of Low Work Function Perovskite SrVO₃ Using Thermionic Electron Emission

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Erratum: Magnetoelectric effects in bilayers and multilayers of magnetostrictive and piezoelectric perovskite oxides [Phys. Rev. B65, 134402 (2002)]

Cited by 97 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

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

Demonstration of Low Work Function Perovskite SrVO3 Using Thermionic Electron Emission

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Demonstration of Low Work Function Perovskite SrVO₃ Using Thermionic Electron Emission