Dynamics of localized modes in a composite multiferroic chain.

Dynamics of localized modes in a composite multiferroic chain.
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复合多铁链中局域模的动力学

DOI:
10.1103/physrevlett.111.117202
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发表时间:
2013
影响因子:
8.6
通讯作者:
J. Berakdar
J. Berakdar
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
L. Chotorlishvili;R. Khomeriki;A. Sukhov;S. Ruffo;J. Berakdar

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在铁电-铁磁耦合系统,即复合多铁体中,磁或铁电激励在整个结构中的传播是一个关键的应用问题。特别令人感兴趣的是铁电-铁磁界面上的局域磁模或铁电模(LM)的动力学,特别是当LM的载波频率在铁电频带和铁磁体的带隙中时。对于合适的系统参数选择,我们发现存在一个阈值幅度,超过这个阈值,界面变得透明,带内铁电LM穿透铁磁阵列。低于该阈值时,将完全反映LM。只要噪声水平既不太低也不太高,在略低于这个传输阈值的情况下,噪声的添加可能会导致能量传输,这种效果类似于随机共振。这些发现代表着朝着应用铁电和/或铁磁基于LM的逻辑迈出了重要的一步。
In a coupled ferroelectric-ferromagnetic system, i.e., a composite multiferroic, the propagation of magnetic or ferroelectric excitations across the whole structure is a key issue for applications. Of special interest is the dynamics of localized magnetic or ferroelectric modes (LM) across the ferroelectric-ferromagnetic interface, particularly when the LM’s carrier frequency is in the band of the ferroelectric and in the band gap of the ferromagnet. For a proper choice of the system’s parameters, we find that there is a threshold amplitude above which the interface becomes transparent and an in-band ferroelectric LM penetrates the ferromagnetic array. Below that threshold, the LM is fully reflected. Slightly below this transmission threshold, the addition of noise may lead to energy transmission, provided that the noise level is neither too low nor too high, an effect that resembles stochastic resonance. These findings represent an important step towards the application of ferroelectric and/or ferromagnetic LM-based logic.
具有扇出和交叉功能的基于磁孤子的逻辑
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