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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Magnetic films of negative Poisson's ratio in rotating magnetic fields
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Magnetic films of negative Poisson's ratio in rotating magnetic fields

机译：旋转磁场中具有负泊松比的磁性膜

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摘要

Mechanical properties of a thin magnetic film subjected to an external, rotating magnetic field have been studied by computer simulations. The film is modeled by a two-dimensional bead-spring model of a nonmagnetic polymer matrix with inclusions of magnetic nanoparticles (nanograins) of uniaxial anisotropy, The isotropic polymer matrix is represented as a hexagonal structure with sites decorated with small hexagonal particles containing magnetic nanograins. The beads correspond to polymer segments and the springs between them imitate chemical bonds, approximated by harmonic interactions. The beads also interact by the Lennalcl-Jones potential whose role is to mimic the core of non-bonded polymer segments. The Poisson ratio of the constructed polymer matrix is negative, i.e. the system expands laterally under longitudinal stretching force. It is shown that the magneto-elastic coupling can be used to control the expansion and contraction of the polymer matrix. Depending on the applied magnetic field, the Poisson ratio of the magnetic film may assume positive or negative Values. (c) 2008 Elsevier B.V. All rights reserved.
机译：已经通过计算机模拟研究了经受外部旋转磁场的磁性薄膜的机械性能。该膜通过非磁性聚合物基质的二维珠-弹簧模型建模，其中包含单轴各向异性的磁性纳米颗粒（纳米粒），各向同性聚合物基质表示为六边形结构，其位置装饰有包含磁性纳米颗粒的小六边形颗粒。珠子对应于聚合物链段，它们之间的弹簧模仿化学键，近似为谐波相互作用。珠粒还通过Lennalcl-Jones电位相互作用，其作用是模仿未键合的聚合物链段的核心。所构建的聚合物基质的泊松比为负，即系统在纵向拉伸力的作用下横向膨胀。结果表明，磁弹性耦合可以用来控制聚合物基体的膨胀和收缩。取决于所施加的磁场，磁性膜的泊松比可以取正值或负值。 （c）2008 Elsevier B.V.保留所有权利。

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