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首页> 外文期刊>Advanced Materials >Mechanical Loss in Multiferroic Materials at High Frequencies: Friction and the Evolution of Ferroelastic Microstructures
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Mechanical Loss in Multiferroic Materials at High Frequencies: Friction and the Evolution of Ferroelastic Microstructures

机译：高频下多铁性材料的机械损耗：摩擦和铁弹性微结构的演变

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摘要

The development of novel multiferroic device materials hits a fundamental limitation when the driving frequency is increased beyond 50 MHz. Ultimately, we want to use detectors, memory chips and converters between electric and magnetic signals at such high frequencies. The idea is, hence, that device materials need to be defect free because any extrinsic defect relaxation will be slower than the operating frequency and will hence absorb the external signal. The solution of this conundrum was to use very clean multiferroic materials where the desired change of electric and magnetic dipoles is very fast in thin films. We will show in this paper that this solution does not work in most materials where coupling to ferroelasticity is strong. Empirically, it is already known that the movement of ferroelastic domain boundaries involves high losses and is highly dissipa-tive (e.g. in relaxor materials). However, the origin of these losses was unclear. In this paper we demonstrate that only two mechanisms dominate the loss effects, namely, the propagation of needle domains and the movements of wall kinks.
机译：当驱动频率增加到50 MHz以上时，新型多铁性器件材料的开发受到了根本的限制。最终，我们希望在如此高频的电信号和磁信号之间使用检测器，存储芯片和转换器。因此，该想法是，器件材料需要无缺陷，因为任何外部缺陷的松弛都会比工作频率慢，因此会吸收外部信号。这个难题的解决方案是使用非常干净的多铁性材料，其中薄膜中的电和磁偶极子的所需变化非常快。我们将在本文中证明，该解决方案不适用于大多数与铁弹性耦合强的材料。根据经验，已经知道，铁弹性域边界的移动涉及高损耗并且是高度耗散的（例如在松弛材料中）。但是，这些损失的根源尚不清楚。在本文中，我们证明只有两种机制主导着损失效应，即针状区域的传播和壁扭结的运动。

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  • 来源
    《Advanced Materials》 |2013年第23期|3244-3248|共5页
  • 作者

    Z. Zhao; X. Ding; T. Lookman; J. Sun; E. K. H. Salje;

  • 作者单位

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049, China;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049, China,Theoretical Division and Center for Nonlinear Studies Los Alamos National Laboratory Los Alamos, NM 87545, USA;

    Theoretical Division and Center for Nonlinear Studies Los Alamos National Laboratory Los Alamos, NM 87545, USA;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049, China;

    State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049, China,Department of Earth Sciences University of Cambridge Cambridge CB2 3EQ, UK,Theoretical Division and Center for Nonlinear Studies Los Alamos National Laboratory Los Alamos, NM 87545, USA;

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