Mesoscopic magnetomechanical hysteresis in a magnetorheological elastomer
Mesoscopic magnetomechanical hysteresis in a magnetorheological elastomer
复制标题
DOI：
10.1103/physreve.92.023202
复制
发表时间：
2015-08-26
影响因子：
2.4
通讯作者：
Raikher, Yu. L.
中科院分区：
文献类型：
--
作者：
Biller, A. M.;Stolbov, O. V.;Raikher, Yu. L.
研究了由软磁铁磁体组成的一对相同粒子中的场致静磁相互作用。结果表明，由于铁磁饱和，这种情况与(超)顺磁情况有很大的不同。给出了一种数值解，并对其进行了讨论，并与一种更简单的模型(非线性相互偶极子)的解进行了比较。我们发现，对于嵌入弹性体基质中的多磁区铁磁粒子，对于同一环境中的顺磁性粒子，可能会形成或断裂成对团簇，出现滞后现象。然而，磁化饱和度对这一效应带来了重要的特征。首先，双稳态和磁滞只发生在系统材料参数的有限范围内。其次，伴随着在磁场的单独影响下发生的滞后跳跃，只有在磁场的作用与一些额外的(非磁性)外部因素相结合的情况下，才有可能实现“潜伏的”滞后。所得到的条件用于评估真实磁流变聚合物中聚集的可能性，推断介观磁力滞对这些复合材料的宏观性能具有重要作用。
Field-induced magnetostatic interaction in a pair of identical particles made of a magnetically soft ferromagnet is studied. It is shown that due to saturation of the ferromagnet magnetization, this case differs significantly from the (super) paramagnetic one. A numerical solution is given, discussed, and compared with that provided by a simpler model (nonlinear mutual dipoles). We show that for multidomain ferromagnetic particles embedded in an elastomer matrix, as for paramagnetic ones in the same environment, pair clusters may form or break by a hysteresis scenario. However, the magnetization saturation brings in important features to this effect. First, the bistability state and the hysteresis take place only in a limited region of the material parameters of the system. Second, along with the hysteresis jumps occurring under the sole influence of the field, the "latent" hysteresis is possible which realizes only if the action of the field is combined with some additional (nonmagnetic) external factor. The obtained conditions, when used to assess the possibility of clustering in real magnetorheological polymers, infer an important role of mesoscopic magnetomechanical hysteresis for the macroscopic properties of these composites.