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27 Feb 2012

Volume 100, Issue 9, Articles (09xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 100, 093101 (2012); http://dx.doi.org/10.1063/1.3687190 (4 pages)

Jinhai Mao, Li Huang, Yi Pan, Min Gao, Junfeng He, Haitao Zhou, Haiming Guo, Yuan Tian, Qiang Zou, Lizhi Zhang, Haigang Zhang, Yeliang Wang, Shixuan Du, Xingjiang Zhou, A. H. Castro Neto, et al.
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Deposition of epitaxial BiFeO3/CoFe2O4 nanocomposites on (001) SrTiO3 by combinatorial pulsed laser deposition

Nicolas M. Aimon, Dong Hun Kim, Hong Kyoon Choi, and C. A. Ross

Appl. Phys. Lett. 100, 092901 (2012); http://dx.doi.org/10.1063/1.3690957 (4 pages) | Cited 8 times

Online Publication Date: 28 February 2012

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BiFeO3/CoFe2O4 (BFO/CFO) nanocomposites were grown on SrTiO3 by pulsed laser deposition using a combinatorial method in which Bi1.2FeO3 and CoFe2O4 targets are alternately ablated. The films had the same vertically nanostructured morphology as thin films prepared by ablation of a single target, consisting of epitaxial CoFe2O4 pillars in a BiFeO3 matrix. In a series of samples synthesized with a compositional spread, the out-of-plane magnetic anisotropy and the out-of-plane compressive strain of the CoFe2O4 pillars increased with decreasing volume fraction, and the anisotropy agreed with the value predicted from the strain state and magnetoelastic coefficients of CoFe2O4. These results show the dominant effect of magnetoelastic anisotropy in determining the magnetic hysteresis of the nanocomposite.
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81.15.Fg Pulsed laser ablation deposition
81.40.Lm Deformation, plasticity, and creep
68.55.at Other materials
75.30.Gw Magnetic anisotropy
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.80.+q Magnetomechanical effects, magnetostriction

Magnetoelectric manipulation of domain wall configuration in thin film Ni/[Pb(Mn1/3Nb2/3)O3]0.68-[PbTiO3]0.32 (001) heterostructure

Chin-Jui Hsu (許晉睿), Joshua L. Hockel, and Gregory P. Carman

Appl. Phys. Lett. 100, 092902 (2012); http://dx.doi.org/10.1063/1.3690953 (4 pages) | Cited 4 times

Online Publication Date: 29 February 2012

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This paper reports experimental observations of partial and reversible out-of-plane magnetization change in a thin film Ni/[Pb(Mn1/3Nb2/3)O3]0.68-[PbTiO3]0.32 (001) heterostructure. Electric-field-induced isotropic in-plane compressive strain (∼1000 ppm) eliminates the stripe domain pattern in a 60-nm-thick Ni thin film. When the electric field is removed, the stripe domains are returned to their original configurations with some domain wall pinning perturbations due to ferroelectric domain texturing. The observed domain structure change is attributed to the transition from Bloch wall to Néel wall and the broadening of the Bloch wall. This out-of-plane magnetization change does not occur in thicker (100-nm-thick) Ni thin film.
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75.85.+t Magnetoelectric effects, multiferroics
77.55.Nv Multiferroic/magnetoelectric films
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.60.Ch Domain walls and domain structure
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.70.Kw Domain structure (including magnetic bubbles and vortices)
77.80.Dj Domain structure; hysteresis

Experimental study and theoretical prediction of dielectric permittivity in BaTiO3/polyimide nanocomposite films

Ben-Hui Fan, Jun-Wei Zha, Dong-Rui Wang, Jun Zhao, and Zhi-Min Dang

Appl. Phys. Lett. 100, 092903 (2012); http://dx.doi.org/10.1063/1.3691198 (4 pages) | Cited 4 times

Online Publication Date: 29 February 2012

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Theoretical models were used to predict dielectric permittivities of the thermosetting polyimide (PI) matrix nanocomposite films loading with BaTiO3 (BT) nanoparticles prepared by the alkoxide route. The observed dielectric permittivities are in good agreement with calculated values using Jayasundere equation and effective medium theory when the interactions of nanoparticle-nanoparticle and nanoparticle-polymer are considered. Additionally, temperature dependence of dielectric permittivity of the BT/PI nanocomposite films at 103 Hz was also studied for both heating from −50 to 150 °C and cooling from 150 to −50 °C. The transformation in crystal phase of BT and changes of free volume in PI were considered to be the main factors influencing the dielectric permittivities of the BT/PI nanocomposite films.
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81.05.Qk Reinforced polymers and polymer-based composites
81.40.Rs Electrical and magnetic properties related to treatment conditions
77.55.-g Dielectric thin films
73.61.-r Electrical properties of specific thin films
77.22.Ch Permittivity (dielectric function)

Theoretical model for artificial structure modulation of HfO2/SiOx/Si interface by deposition of a dopant material

Naoto Umezawa and Kenji Shiraishi

Appl. Phys. Lett. 100, 092904 (2012); http://dx.doi.org/10.1063/1.3689968 (4 pages)

Online Publication Date: 29 February 2012

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Realization of an abrupt HfO2/Si interface without unintentional oxidation of the silicon substrate is a crucial task for the development of modern field-effect transistors. Here, we present a theoretical model which suggests that deposition of a dopant material on the HfO2 layer turns it into an oxygen absorber, suppressing the formation of SiOx at the interface. Tantalum is predicted as an effective dopant in HfO2 for this purpose.
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85.30.Tv Field effect devices
85.40.Ry Impurity doping, diffusion and ion implantation technology

Dipole spring ferroelectrics in superlattice SrTiO3/BaTiO3 thin films exhibiting constricted hysteresis loops

Pingping Wu, Xingqiao Ma, Yulan Li, Venkatraman Gopalan, and Long-Qing Chen

Appl. Phys. Lett. 100, 092905 (2012); http://dx.doi.org/10.1063/1.3691172 (4 pages) | Cited 1 time

Online Publication Date: 1 March 2012

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Ferroelectric superlattice heterostructures have recently been explored for potential applications in electronic devices. In this letter, we employed the phase-field approach to simulate the domain structure and switching of a (BaTiO3)8/(SrTiO3)3 superlattice film constrained by a GdScO3 substrate. A constricted ferroelectric hysteresis loop was observed with a high saturation polarization but a small coercive field. The shape of the hysteresis loop is understood by analyzing the ferroelectric polarization distributions during switching. It is demonstrated that the multilayers stack behaves as dipole spring ferroelectric, named in analogy to exchange spring magnets in magnetic multilayers that show similar loops.
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77.80.Dj Domain structure; hysteresis
77.80.Fm Switching phenomena
77.84.-s Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials
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