Magnetoresistance is a multifaceted effect reflecting the diverse transport mechanisms exhibited by different kinds of plain materials and hybrid nanostructures; among other, giant, colossal, and extraordinary magnetoresistance versions exist, with the notation indicative of the intensity. Here we report on the superconducting magnetoresistance observed in ferromagnet/superconductor/ferromagnet trilayers, namely Co/Nb/Co trilayers, subjected to a parallel external magnetic field equal to the coercive field. By manipulating the transverse stray dipolar fields that originate from the out-of-plane magnetic domains of the outer layers that develop at coercivity, we can suppress the supercurrent of the interlayer. We experimentally demonstrate a scaling of the magnetoresistance magnitude that we reproduce with a closed-form phenomenological formula that incorporates relevant macroscopic parameters and microscopic length scales of the superconducting and ferromagnetic structural units. The generic approach introduced here can be used to design novel cryogenic devices that completely switch the supercurrent ‘on’ and ‘off’, thus exhibiting the ultimate magnetoresistance magnitude 100% on a regular basis.
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机译：磁阻是一个多方面的效应，反映了不同种类的普通材料和杂化纳米结构所表现出的多种传输机制。其中，存在巨大的，巨大的和非常大的磁阻版本，其中的符号表示强度。在这里，我们报告在铁磁体/超导体/铁磁体三层（即Co / Nb / Co三层）中，在平行于等于矫顽场的平行外部磁场下观察到的超导磁阻。通过操纵源自以矫顽力发展的外层的平面外磁畴产生的横向杂散偶极场，我们可以抑制中间层的过电流。我们通过实验证明了磁阻大小的标度，该磁阻量级是通过闭合形式的现象公式再现的，该公式结合了相关的宏观参数以及超导和铁磁结构单元的微观长度尺度。此处介绍的通用方法可用于设计新颖的低温设备，该设备可完全切换“开”和“关”超电流，从而定期显示100％的极限磁阻强度。
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