论文标题
使用不均匀的电场在相分离锰矿中铁磁区域的动态渗透
Dynamic percolation of ferromagnetic regions in phase separated manganites using non-uniform electric fields
论文作者
论文摘要
锰矿的薄膜（la $ _ {1-y} $ pr $ _y $）$ _ {1-x} $ ca $ _x $ _x $ mno $ _3 $与微尺度，流体级别的流体速率金属（FMM）区域具有动态阶段共存，该区域被带入电荷订购（GOII）的背景（GOII）。先前据报道，由于类似于介电的现象，均匀的电场将流体样的FMM区域重新调整。在这里，我们报告说，不均匀的电场对介电模型预期的FMM区域具有更强的影响。与均匀场的结果相比，在更广泛的温度范围内观察到FMM区域的动态渗透。此外，在一个不均匀的电场中，沿磁性硬轴（$ t _ {\ Mathrm {b}} $）动态渗透所需的时间随着施加的电压的增加而减少（$ v _ {\ mathrm {a}} $） $δ\约5 $，而$Δ<2 $用于均匀的电场。我们在不均匀的电场中的结果提供了有力的证据，以支持介电性模型，并使用电场来操纵微米大小的铁磁区域的独特方法。
Thin films of the manganite (La$_{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.
