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  • AIP Publishing  (15)
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  • AIP Publishing  (15)
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  • 1
    Online Resource
    Online Resource
    The magnetic and magnetocaloric properties of NdFe12−xMox compounds
    AIP Publishing ; 2012
    In:  Journal of Applied Physics Vol. 111, No. 7 ( 2012-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 111, No. 7 ( 2012-04-01)
    Abstract: The crystal structure and magnetic properties of NdFe12−xMox (x = 2.25, 2.5, 2.75, 3.0) compounds were synthesized and investigated. These compounds crystallized in ThMn12-type single phase, and the Curie temperature decreased with increasing Mo content. NdFe9.5Mo2.5 has a Curie temperature around room temperature, and a reversible magnetic entropy change was observed ∼290 K due to the second-order magnetic transition. The maximum value of −ΔSM is 2.38 J kg-1 K-1 at 290 K for a magnetic field change of 50 kOe. The working temperature span is more than 150 K and the relative cooling power reaches 357 J/kg, which makes the compound a promising candidate for magnetic refrigerator vicinal room temperature.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3680204
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    High energy density and efficiency achieved in nanocomposite film capacitors via structure modulation
    AIP Publishing ; 2018
    In:  Applied Physics Letters Vol. 112, No. 10 ( 2018-03-05)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 112, No. 10 ( 2018-03-05)
    Abstract: Flexible dielectric polymer films with high energy storage density and high charge-discharge efficiency have been considered as promising materials for electrical power applications. Here, we design hierarchical structured nanocomposite films using nonlinear polymer poly(vinylidene fluoride-HFP) [P(VDF-HFP)] with inorganic h-boron nitride (h-BN) nanosheets by electrospinning and hot-pressing methods. Our results show that the addition of h-BN nanosheets and the design of the hierarchical multilayer structure in the nanocomposites can remarkably enhance the charge-discharge efficiency and energy density. A high charge-discharge efficiency of 78% and an energy density of 21 J/cm3 c an be realized in the 12-layered PVDF/h-BN nanocomposite films. Phase-field simulation results reveal that the spatial distribution of the electric field in these hierarchical structured films affects the charge-discharge efficiency and energy density. This work provides a feasible route, i.e., structure modulation, to improve the energy storage performances for nanocomposite films.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5012006
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    Physical and chemical strains co-tuned magnetic properties of double perovskite PrBaMn2O5.5+δ epitaxial films
    AIP Publishing ; 2019
    In:  Applied Physics Letters Vol. 115, No. 8 ( 2019-08-19)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 115, No. 8 ( 2019-08-19)
    Abstract: Different layered perovskite-related oxides are known to exhibit important electronic, magnetic, and electrochemical properties including metal-insulator transition, colossal magnetoresistance, excellent mixed ionic/electronic conductivity, and especially their flexible tunability by external or internal stimuli. Here, we show that the microstructure and magnetic properties of double perovskite PrBaMn2O5.5+δ (PBMO) epitaxial films can be co-tuned by the physical strain via a proper choice of substrate and film thickness and the chemical strain from the concentration of oxygen vacancies. It is surprisingly found that the films with more oxygen vacancies reveal more Mn4+ formed along with Mn2+ under the influence of interface strain, and meanwhile, Mn4+ exhibits a thickness-dependent distribution with a high amount at the interface. Consequently, the increased proportion of Mn4+ diminishes the saturation magnetization and decreases the Curie temperature of PrBaMn2O5.5+δ epitaxial films, revealing the availability of physical and chemical strains tuning the properties of highly epitaxial double perovskite films.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5114865
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Dielectric behavior of graphene/BaTiO3/polyvinylidene fluoride nanocomposite under high electric field
    AIP Publishing ; 2013
    In:  Applied Physics Letters Vol. 103, No. 7 ( 2013-08-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 103, No. 7 ( 2013-08-12)
    Abstract: Three-phase graphene/BaTiO3/polyvinylidene fluoride composites films are prepared with a simple solution-cast method. The effects of graphene oxides (GOs) and reduced graphene oxides (RGOs) on the dielectric behavior of the three-phase composites are investigated at elevated electric field up to 150 kV/mm. BaTiO3 nanoparticles isolate the graphene nanosheets, leading to much higher percolation threshold. The introduction of both RGOs and GOs increases the leakage current in the three-phase composites at elevated electric field. The positive-up-negative-down measurements indicate that the switched polarization slightly increases with the addition of RGOs or GOs and is much smaller than the remnant polarization obtained from the P-E loops.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4818763
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Magnetic properties and magnetocaloric effect in Nd5Si3 compound
    AIP Publishing ; 2010
    In:  Journal of Applied Physics Vol. 107, No. 9 ( 2010-05-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 107, No. 9 ( 2010-05-01)
    Abstract: The structure and magnetic properties of Nd5Si3 compound have been investigated. A reversible magnetic entropy change was observed at about 112 K accompanied with a second-order magnetic transition from the ferromagnetic to paramagnetic state. The maximum value of −ΔSM is 5.0 J kg−1 K−1 at 112 K for a magnetic field change of 50 kOe. The relatively large magnetic entropy change and broad working-temperature span (about 57 K) of the reversible magnetocaloric effect make the present compound a potential candidate for the practical magnetic refrigeration in this temperature range.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3359811
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 6
    Online Resource
    Online Resource
    A simple method for direct observation of the converse magnetoelectric effect in magnetic/ferroelectric composite thin films
    AIP Publishing ; 2011
    In:  Journal of Applied Physics Vol. 110, No. 9 ( 2011-11-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 110, No. 9 ( 2011-11-01)
    Abstract: A novel characterization method is presented to directly observe the pure converse magnetoelectric (ME) effect, i.e., the electric-field modification of magnetization, in composite magnetic/ferroelectric (FE) layered thin films. A low-frequency AC electric-voltage, rather than DC voltage bias, is applied to the FE thin films to minimize the leakage current, whereby the possible side effect of heating can be avoided. In particular, by synchronizing the frequency of the Kerr signal detector to the AC actuation voltage bias, the voltage-induced change of the magnetization in the magnetic films can be in situ recorded even under zero external magnetic fields. For illustration, this method is applied to two similar magnetic/FE composite thin films, with significant strain-mediated converse ME coupling being demonstrated in both cases.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3660694
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 7
    Online Resource
    Online Resource
    Significant enhancement in energy density of polymer composites induced by dopamine-modified Ba0.6Sr0.4TiO3 nanofibers
    AIP Publishing ; 2012
    In:  Applied Physics Letters Vol. 101, No. 15 ( 2012-10-08)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 101, No. 15 ( 2012-10-08)
    Abstract: Ba0.6Sr0.4TiO3 (BST) nanofibers prepared via electrospinning and modified by dopamine are used as dielectric fillers in polyvinylidene fluoride (PVDF)-based composites. With 4.4 vol. % of BST nanofibers, the extractable energy density of the BST/PVDF composites is more than doubled as compared with pure PVDF matrix. Such significant enhancement is attributed to the combined effect of both surface modification by dopamine and large aspect ratio of the BST nanofibers. Paraelectric or anti-ferroelectric fillers of large aspect ratio may serve as a general strategy for enhanced electric energy density in polymer composites.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4760228
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    Scalable Nernst thermoelectric power using a coiled galfenol wire
    AIP Publishing ; 2017
    In:  AIP Advances Vol. 7, No. 9 ( 2017-09-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 7, No. 9 ( 2017-09-01)
    Abstract: The Nernst thermopower usually is considered far too weak in most metals for waste heat recovery. However, its transverse orientation gives it an advantage over the Seebeck effect on non-flat surfaces. Here, we experimentally demonstrate the scalable generation of a Nernst voltage in an air-cooled metal wire coiled around a hot cylinder. In this geometry, a radial temperature gradient generates an azimuthal electric field in the coil. A Galfenol (Fe0.85Ga0.15) wire is wrapped around a cartridge heater, and the voltage drop across the wire is measured as a function of axial magnetic field. As expected, the Nernst voltage scales linearly with the length of the wire. Based on heat conduction and fluid dynamic equations, finite-element method is used to calculate the temperature gradient across the Galfenol wire and determine the Nernst coefficient. A giant Nernst coefficient of -2.6 μV/KT at room temperature is estimated, in agreement with measurements on bulk Galfenol. We expect that the giant Nernst effect in Galfenol arises from its magnetostriction, presumably through enhanced magnon-phonon coupling. Our results demonstrate the feasibility of a transverse thermoelectric generator capable of scalable output power from non-flat heat sources.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5003611
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 2583909-3
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  • 9
    Online Resource
    Online Resource
    Switchable voltage control of the magnetic coercive field via magnetoelectric effect
    AIP Publishing ; 2011
    In:  Journal of Applied Physics Vol. 110, No. 4 ( 2011-08-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 110, No. 4 ( 2011-08-15)
    Abstract: Switchable voltage modulation of the magnetic properties is reported in different multiferroic bilayers with magnetic films grown on pre-poled ferroelectric substrates, based on the magneto-optical Kerr effect observations. The dynamic voltage control of the magnetic coercive field (Hc) is dependent not only on the materials properties of each ferroic layer, but also on the bias voltage history. The Hc versus electric field behaviors essentially track the dependence of the piezostrains of the substrates on the bias voltage. The observations demonstrate that Hc in such multiferroic bilayers can be controlled by voltage via strain-mediated magnetoelectric coupling and that the Hc change is not an artifact due to a heating effect.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3626748
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 10
    Online Resource
    Online Resource
    Evaluating the electro-optical effect in alternating current-voltage-modulated Kerr response for multiferroic heterostructures
    AIP Publishing ; 2013
    In:  Journal of Applied Physics Vol. 114, No. 20 ( 2013-11-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 114, No. 20 ( 2013-11-28)
    Abstract: Voltage-modified Kerr magnetometer has been widely used to measure the voltage-modulated magnetic properties in multiferroic magnetic/ferroelectric heterostructures, where the Kerr signal change is considered to be in proportion to magnetization change, i.e., the magneto-optical Kerr effect. However, the total Kerr signal changes might also incorporate contribution from the electro-optical effect of the ferroelectric layer in the multiferroic heterostructure. Here, we evaluate quantitatively, by combining analytical calculations with experimental observations, such electro-optical contribution in the total voltage-induced Kerr signal changes with comparison to those from Kerr effect via converse magnetoelectric coupling. Influences of several parameters, including the magnetic film thickness on the Kerr signal changes, are also investigated.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4833573
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
    Location Call Number Limitation Availability
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