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Journal of Applied Physics Collection


 
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Journal of Applied Physics : Fabrication of YBa2Cu3O7 thin film on...

By: Makoto Tokudome, Toshiya Doi, Ryota Tomiyasu, Shinya Sato, Yoshinori Hakuraku et al

Description: We achieved a biaxially oriented YBa2Cu3O7 film on a {100} 〈001〉 textured Cu tape with Jc of 1.9×106 A cm−2 at 77 K. A Ni overlayer was deposited by electroplating technique on the {100} 〈001〉 textured Cu tape to improve oxidation resistance of Cu substrate, and then YBa2Cu3O7 was deposited on the CeO2/YSZ/CeO2 buffered Ni-electroplated Cu tape. We confirmed that the Ni-electroplated Cu tape lost its ferromagnetism after 700 °C at 1 h heat treatment. Our rol...

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Journal of Applied Physics : Low field giant magnetoresistance in ...

By: S. Jain and A. O. Adeyeye

Description: The giant magnetoresistance response of ellipse shaped Co(10 nm)/Cu(8 nm)/Ni80Fe20(10 nm)/Cu(2 nm) rings magnetostatically coupled to external magnetic elements has been systematically investigated. Magnetoresistance responses at low field show distinct states when the field is cycled through various intermediate magnetization states of Ni80Fe20 and Co layers. Due to strong magnetostatic coupling between the ring and the external magnetic elements, these met...

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Journal of Applied Physics : Magnetic cluster glass behavior and g...

By: B. Roy and S. Das

Description: The magnetic and transport properties of Nd0.7Ba0.3MnO3 nanoparticles were explored by transmission electron microscopy, x-ray powder diffraction, resistivity, magnetoresistance, thermopower (S), and magnetic measurements. The metal-insulator transition behavior of the temperature dependence of resistivity for the sample with the largest particle size changes to insulating nature with the decrease in the particle size due to the enhancement of the grain boun...

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Journal of Applied Physics : Equivalent magnetic charge in helicoi...

By: Roberto Muscia

Description: In this paper we show that magnetostatic models of permanent magnets, based on distributions of magnetic charge and shaped by a helicoidal geometry of cylindrical type, have the volume charge density ρM equal to zero. This result is valid when (i) the modulus of the vector physical magnetization density M has a constant value in all the points of the helicoidal magnet and (ii) M has the same direction of an oriented straight line having a constant angle with...

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Journal of Applied Physics : Formation and evolution of magnetic n...

By: J. Kliava, I. Edelman, O. Ivanova, R. Ivantsov, O. Bayukov et al

Description: Evolution of the phase state of paramagnetic additions at various stages of synthesis and subsequent thermal treatment of glasses of the system Al2O3–K2O–B2O3 simultaneously doped with Fe2O3 and MnO is studied by means of a combination of experimental techniques: Faraday rotation (FR), electron magnetic resonance (EMR), transmission electron microscopy (TEM), Mössbauer spectroscopy, and magnetic measurements. Both FR and EMR show that magnetically ordered cl...

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Journal of Applied Physics : On PbTiO3-(111)-Pt interfacial layers...

By: S. Habouti, C-H. Solterbeck, M. Es-Souni, and V. Zaporojtchenko

Description: In this work emphasis is placed on the investigation of interfacial layers between sol-gel processed PbTiO3 (PTO) thin films and (111)Pt terminated silicon substrates. The methods used are x-ray diffraction, x-ray photoelectron spectroscopy (XPS) combined with depth profiling, and atomic force microscopy (AFM). In order to avoid artifacts related to ion bombardment, e.g., reduction of Pb ions and preferential sputtering, gentle argon ion bombardment conditio...

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Journal of Applied Physics : dc leakage mechanism in artificial bi...

By: Ayan Roy Chaudhuri and S. B. Krupanidhi

Description: The dc leakage behavior of 0.7Pb(Mg1/3Nb2/3)O3−0.3PbTiO3/La0.6Sr0.4MnO3 asymmetric superlattices has been studied over a wide range of temperatures between 30 and 200 °C. Leakage current characteristics analyzed in the light of different models indicated dominant Poole–Frenkel emission in the lower electric field region. Activation energy calculated from the Poole–Frenkel model was in the range of 0.19–0.34 eV for different superlattice periodicities. For th...

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Journal of Applied Physics : Stress dependence and scaling of subc...

By: R. Yimnirun, N. Wongdamnern, N. Triamnak, M. Unruan, A. Ngamjarurojana et al

Description: Stress dependence and scaling behavior of subcoercive field dynamic ferroelectric hysteresis were investigated in rhombohedral 0.5Pb(Zr1/2Ti1/2)O3–0.5Pb(Zn1/3Nb2/3)O3 (0.5PZT–0.5PZN) bulk ceramic with profound relaxor characteristics. The scaling relation of hysteresis area 〈A〉 against frequency f, field amplitude E0, and stress σ for the minor loops takes a form of 〈A−Aσ = 0〉∝f−0.34E03.68σ0.35, which is very similar to that of soft and hard lead zirconate t...

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Journal of Applied Physics : Microwave dielectric and Raman scatte...

By: K. Sudheendran, K. C. James Raju, Manoj K. Singh, and Ram S. Katiyar

Description: Bismuth zinc niobate (Bi1.5Zn1.0Nb1.5O7) thin films were deposited on fused silica substrates by pulsed laser deposition. Its phase composition and microstructure were characterized by x-ray diffraction and atomic force microscopy. The as deposited films were amorphous and all of them were crystallized after a postdeposition annealing at 600 °C for 30 min in air. The crystallite size of the films was found to be varying between 31 and 60 nm with respect to t...

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Journal of Applied Physics : Acoustic anisotropy in uniaxial tungs...

By: Jae-Hyeon Ko, S. G. Lushnikov, Do Han Kim, Seiji Kojima, Byeong-Eog Jun et al

Description: Acoustic properties were investigated for four tungsten bronze (TB) uniaxial ferroelectric crystals, i.e., (Sr0.61Ba0.39)5Nb10O30 (SBN61), Cu-doped (K0.5Na0.5)1.0(Sr0.75Ba0.25)4.5Nb10O30 (KNSBN:Cu), K5.80Li3.82Nb10.12O30, and K4.74Li3.07Nb10.44O30 of which the spontaneous polarization is directed along the polar c axis. Large acoustic anisotropy between the two elastic constants C11 and C33 have been observed from all samples. C33 exhibits a significant soft...

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Journal of Applied Physics : Ferroelectric properties of chemicall...

By: Wataru Sakamoto, Asaki Iwata, and Toshinobu Yogo

Description: Ferroelectric BiFeO3–PbTiO3 thin films with near morphotropic phase boundary composition were synthesized on Pt/TiOx/SiO2/Si substrates by chemical solution deposition. Perovskite BiFeO3–PbTiO3 single-phase thin films were successfully fabricated at 600 °C by optimizing several processing conditions, such as the PbTiO3 content. Typical ferroelectric polarization-electric field (P-E) hysteresis loops were observed for (1−x)BiFeO3–xPbTiO3 (x = 0.2, 0.3, 0.4, 0...

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Journal of Applied Physics : Dielectric tunability of graded bariu...

By: M. B. Okatan, M. W. Cole, and S. P. Alpay

Description: A thermodynamic model was developed to analyze the effect of the difference in the thermal expansion coefficient (TEC) of a multilayered barium strontium titanate Ba1−ySryTiO3 (BST) ferroelectric heterostructure and a passive substrate on the dielectric properties by taking into account electrostatic and electromechanical interactions between the ferroelectric layers. Results show that the dielectric constant and tunability can be maximized by minimizing the...

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Journal of Applied Physics : Raman spectra analysis for Ca(B1/3'B2...

By: M. S. Fu, X. Q. Liu, and X. M. Chen

Description: Ca[(Mg1/3Ta2/3)1−xTix]O3 (hereafter denoted as CMTT) and (Ca1−0.39xNd0.26x) [(Mg1/3Nb2/3)1−xTix]O3 (hereafter denoted as CNMNT) complex perovskite ceramics were studied by Raman spectroscopy combined with Rietveld analysis. The crystal structures changed from monoclinic structure with P21/c space group to orthorhombic structure with Pbnm space group for both systems. The main structure of the two systems was orthorhombic and the characteristic modes for the ...

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Journal of Applied Physics : Multiferroic properties of Ni0.5Zn0.5...

By: Hongfang Zhang, Siu Wing Or, and Helen Lai Wa Chan

Description: We present a powder-in-sol precursor hybrid processing route to synthesize dense, homogenous, and fine-grained Ni0.5Zn0.5Fe2O4–Pb(Zr0.53Ti0.47)O3 (NZFO–PZT) multiferroic ceramic composites and report their ferromagnetic-ferroelectric characteristics. Nanosized NZFO ferromagnetic powders are dispersed into PZT ferroelectric sol-gel precursor and uniformly distributed slurry is prepared by ball-milling mixing of the powder-precursor suspension prior to be sint...

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Journal of Applied Physics : Influence of interfacial dislocations...

By: Y. L. Li, S. Y. Hu, S. Choudhury, M. I. Baskes, A. Saxena et al

Description: We investigated the influence of dislocations, located at the interface of a ferroelectric film and its underlying substrate, on the ferroelectric hysteresis loop including the remanent polarization and coercive field using phase-field simulations. We considered epitaxial ferroelectric BaTiO3 films and found that the hysteresis loop is strongly dependent on the type and density of interfacial dislocations. The dislocations that stabilize multiple ferroelectr...

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Journal of Applied Physics : Magnetoelectric properties of core-sh...

By: Rashed A. Islam, Vishwas Bedekar, Narayan Poudyal, J. Ping Liu, and Shashank Priya

Description: In this study, we report results on magnetoelectric (ME) core-shell Pb(Zr,Ti)O3 (PZT)-NiFe2O4 (NF) particulate nanocomposites. NF particles forming the shell had size in range of 20–30 nm. The grain size of sintered nanocomposites was found to be in the range of 500–800 nm. The sintered nanocomposite exhibited piezoelectric coefficient (d33) of 60 pC/N, dielectric constant of 865, and ME coefficient of 195 mV/cm Oe. High ME coefficient was observed for wide ...

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Journal of Applied Physics : Influence of Mg doping on the giant d...

By: Yi Liu, Chang-Hui Li, Xiang-Qun Zhang, Zhao-Hua Cheng, and Young Sun

Description: A giant dielectric tunability effect in LuFe2O4 was recently discovered by our group. Here we report the influence of Mg doping on the dielectric tunability and dielectric loss in LuFe2−xMgxO4 (x ≤ 0.1) samples. It was found that the temperature interval of the giant dielectric tunability is broadened by a slight (5%) Mg doping, while the dielectric loss remains the same order. The maximum value of tunability is reduced by Mg doping, which supports the viewp...

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Journal of Applied Physics : Hopping conduction and low-frequency ...

By: J. Yang, X. J. Meng, M. R. Shen, L. Fang, J. L. Wang et al

Description: The highly (00l)-oriented 5 mol % Mn doped Pb0.5Sr0.5TiO3 films with remarkable ferroelectric properties (2Pr = 27.1 μC/cm2 and 2Ec = 55.5 kV/cm) were fabricated on LaNiO3 coated silicon substrates by chemical solution deposition. The ac conductivity and the dielectric response of the films at various temperatures were studied. Hopping conduction accompanied by the dielectric relaxation at low frequencies was observed. The results can be correlated with the ...

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Journal of Applied Physics : Relaxations in Ba2BiSbO6 double compl...

By: Manoel Carvalho Castro, Carlos William de Araujo Paschoal, Frank C. Snyder, and Michael W. Lufaso

Description: The electric properties of the complex double perovskite Ba2BiSbO6 have been investigated using impedance spectroscopy in the frequency range from 1 Hz up to 1 MHz and in the temperature range from room temperature up to 560 K. There are two contributions to the electrical properties due to the grain and grain boundary. The oxygen vacancies play an important role in the conductivity and strongly increase the dielectric constant at high temperatures. The anal...

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Journal of Applied Physics : Strain behavior of lanthanum modified...

By: A. Z. Simões, E. C. Aguiar, A. H. M. Gonzalez, J. Andrés, E. Longo et al

Description: Pure and lanthanum modified BFO (LaxBi1−xFeO3, x = 0.0, 0.08, 0.15, 0.30) thin films were fabricated on Pt(111)/Ti/SiO2/Si substrates by the soft chemical method. The effect of La substitution on the structural and electrical properties was studied. Scanning electron microscopy, x-ray diffraction, and Raman spectroscopy have been employed to characterize the thin films while the piezoelectric measurements were carried out using a setup based on an atomic for...

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