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Soft Magnetic Lithography And Giant Magnetoresistance In Superconducting/ferromagnetic Hybrids

机译:超导/铁磁混合体的软磁光刻技术和巨磁阻

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摘要

We demonstrate an approach to create a tunable pinning potential in a superconducting/ferromagnetic (SC/ FM) hybrid, allowing the switching of their electronic properties through the application of a small magnetic field. Using direct magneto-optical imaging, macroscopic transport, and magnetic measurements, we show that the alignment of stripe domains in the ferromagnet provides a remarkable directionality for the superconducting vortex motion. An analysis of the anisotropic flux motion demonstrates a substantial critical current anisotropy in the superconductor. The possibility of aligning stable lattices of stripe domains in select directions using in-plane magnetic fields allows the realization of soft magnetic lithography for efficient manipulation of supercurrent flow in SC/FM bilayers. Furthermore, in our samples we observed a pronounced magnetoresistance effect yielding 4 orders of magnitude resistivity change in a few millitesla in-plane field.
机译:我们演示了一种在超导/铁磁(SC / FM)混合电路中创建可调钉扎电势的方法,该方法允许通过施加小磁场来切换其电子特性。使用直接的磁光成像,宏观传输和磁测量,我们显示出铁磁体中的磁畴的排列为超导涡旋运动提供了显着的方向性。对各向异性通量运动的分析表明,超导体中存在很大的临界电流各向异性。使用平面内磁场在选定方向上对齐条带域的稳定晶格的可能性允许实现软磁光刻技术,以有效控制SC / FM双层中的超电流。此外,在我们的样品中,我们观察到了显着的磁阻效应,在几个毫特斯拉面内场中产生了4个数量级的电阻率变化。

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