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arXiv 0902.2592cond-mat.mtrl-sci
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多铁性双层膜中的磁场相关拉曼散射:应力介导磁电耦合的证据

Magnetic-Field-Dependent Raman Scattering in Multiferroic Bilayer Films: Evidence for Stress-Mediated Magnetoelectric Coupling

Zheng Li, Yao Wang, Yuanhua Lin, Cewen Nan

摘要:

首次报道了Pb(Zr,Ti)O_3-CoFe_2 O_4双层多铁体系的磁场相关拉曼散射研究。纳米双层膜的声子频率随着磁场的变化而发生明显的变化,而单层Pb(Zr,Ti)O3膜则没有这种变化。CoFe 2 O 4层的磁致伸缩产生机械传递到Pb(Zr,Ti)O3层的应力,导致模式变化。观察到的磁场诱导软化的软模式的Pb(Zr,Ti)O3层承担着一个惊人的相似的直接磁电输出的双层,提供证据的应力介导的磁电耦合机制的多铁性双层。

英文摘要:

We report the first magnetic-field-dependent Raman scattering studies on Pb(Zr,Ti)O3-CoFe2O4 bilayer multiferroic system. The phonon frequencies of the nano-bilayers obviously change with magnetic field, which is absent in the single Pb(Zr,Ti)O3 films. The magnetostriction of the CoFe2O4 layer generates stress mechanically transferred to the Pb(Zr,Ti)O3 layer, resulting in the mode changes. The observed magnetic-field-induced softening of the soft mode in the Pb(Zr,Ti)O3 layer bears a striking resemblance to direct magnetoelectric output in the bilayers, providing evidence for stress-mediated magnetoelectric coupling mechanism in the multiferroic bi-layers.

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