非均匀电场作用下相分离锰氧化物铁磁区的动态渗流
Dynamic percolation of ferromagnetic regions in phase separated manganites using non-uniform electric fields
摘要：
锰氧化物（La $_{1-y}$ Pr $_y$）$_{1-x}$ Ca $_x$ MnO $_3$的薄膜表现出与散布在电荷序绝缘（COI）背景中的微米级流体状铁磁金属（FMM）区域的动态相共存。先前已经报道，由于类似于介电电泳的现象，均匀电场重新排列流体状FMM区域。在这里，我们报告说，非均匀的电场有一个更强的影响FMM地区预期从介电泳模型。在较宽的温度范围内观察到的FMM区域的动态渗流相比，在一个均匀的字段的结果。此外，在非均匀电场中，沿硬磁轴的动态渗流（$t_{\mathrm{B}}$）所需的时间随着施加电压（$V_{\mathrm{A}}$）的增加而减少，呈幂律，$V_{\mathrm{A}}^{-δ}$与$δ\approx 5$，而$δ< 2$用于均匀电场。我们在非均匀电场中的结果为介电泳模型提供了强有力的证据，并为利用电场操纵微米级铁磁区域提供了一种独特的方法。
英文摘要：
Thin films of the manganite (La$_{1-y}$Pr$_y$)$_{1-x}$Ca$_x$MnO$_3$ exhibit dynamic phase coexistence with micrometer scale, fluid-like ferromagnetic metallic (FMM) regions interspersed in a charge-order insulating (COI) background. It has been previously reported that a uniform electric field realigns the fluid-like FMM regions due to a phenomenon similar to dielectrophoresis. Here we report that non-uniform electric fields have a stronger effect on the FMM regions as expected from the dielectrophoresis model. The dynamic percolation of the FMM regions is observed over a wider range of temperatures compared to the results in a uniform field. Additionally, in a non-uniform electric field, the time required for dynamic percolation along the magnetic hard axis ($t_{\mathrm{B}}$) decreased with increasing applied voltage ($V_{\mathrm{A}}$) as a power law, $V_{\mathrm{A}}^{-δ}$ with $δ\approx 5$ while $δ< 2$ for a uniform electric field. Our results in a non-uniform electric field provide strong evidence in favor of the dielectrophoresis model and a unique method for manipulating micrometer-sized ferromagnetic regions using electric fields.
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