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16 Jan 2012

Volume 100, Issue 3, Articles (03xxxx)

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Appl. Phys. Lett. 100, 033109 (2012); http://dx.doi.org/10.1063/1.3664636 (3 pages)

Sang H. Yun, Hyung-Seok Lee, Young Ha Kwon, Mats Göthelid, Sang Mo Koo, Lars Wågberg, Ulf O. Karlsson, and Jan Linnros
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Magnetodielectric effect in Z-type hexaferrite

X. Zhang, Y. G. Zhao, Y. F. Cui, L. D. Ye, J. W. Wang, S. Zhang, H. Y. Zhang, and M. H. Zhu

Appl. Phys. Lett. 100, 032901 (2012); http://dx.doi.org/10.1063/1.3677672 (3 pages) | Cited 1 time

Online Publication Date: 17 January 2012

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The authors report on the magnetodielectric (MD) effect of Z-type hexaferrite Sr3Co2Fe24O41 at various temperatures and frequencies. A fairly large negative MD effect was observed with a peak near room temperature and a maximum at low frequencies. Analysis suggests that the MD effect shows a quadratic dependence on magnetization. The results were discussed by considering the magnetic field induced change of transverse conical spin structure and spin-phonon coupling. This work is helpful for understanding the MD effect in materials with complicated spin structures.
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75.85.+t Magnetoelectric effects, multiferroics
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
75.50.Gg Ferrimagnetics
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
63.20.D- Phonon states and bands, normal modes, and phonon dispersion

Coherent in-plane tensile strain in perovskite Ba0.8Sr0.2TiO3 films on spinel MgAl2O4 substrates

Xiaolan Zhou, Ilan Stern, Punam Silwal, Ludi Miao, and Dae Ho Kim

Appl. Phys. Lett. 100, 032902 (2012); http://dx.doi.org/10.1063/1.3677938 (4 pages)

Online Publication Date: 18 January 2012

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A coherent in-plain tensile strain was achieved in epitaxial films of perovskite Ba0.8Sr0.2TiO3 grown on spinel MgAl2O4 (001) substrates by inserting Ni0.6Al0.4O1 + δ buffer layers. The epitaxial buffer layer exhibits high crystalline quality with a tetragonal symmetry due to the pseudomorphic strain from the spinel substrate and allows coherent growth of the perovskite film. In contrast to the typical ferroelectric hysteresis loops measured along an in-plane direction from strain-relaxed Ba0.8Sr0.2TiO3 films grown directly on the spinel substrate, similar measurements from the buffered films show double hysteretic behavior, indicating the significant influence of isotropic tensile strain on the ferroelectricity.
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77.84.Cg PZT ceramics and other titanates
77.55.Px Epitaxial and superlattice films
68.60.Bs Mechanical and acoustical properties
77.80.Dj Domain structure; hysteresis

Frequency multiplying behavior in a magnetoelectric unimorph

Wenhui Zhang, Ge Yin, Jiangwei Cao, Jianmin Bai, and Fulin Wei

Appl. Phys. Lett. 100, 032903 (2012); http://dx.doi.org/10.1063/1.3678635 (3 pages) | Cited 4 times

Online Publication Date: 19 January 2012

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We observe frequency multiplying behavior in a magnetoelectric (ME) unimorph: such a frequency-multiplied signal is generated when the input frequency (fin) of an alternating current magnetic field (Hac) is around 1/n (n denotes integer) of the mechanical resonance frequency (fr) of the device. We observe both odd and even harmonic signals when a direct current magnetic field (Hdc) is applied, whereas only even harmonic signals arise for Hdc = 0. This behavior results from the combined effect of the nonlinear character of the Metglas magnetostriction and a mechanical resonance phenomenon in the magnetoelectric unimorph.
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85.70.Ec Magnetostrictive, magnetoacoustic, and magnetostatic devices
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