含PdFe纳米磁体的约瑟夫森结的临界电流振荡
Critical Current Oscillations of Josephson Junctions Containing PdFe Nanomagnets
摘要：
具有铁磁层的约瑟夫森结是一类新型低温存储器件中的重要元件。一种类型的存储器器件包含具有一个“硬”磁层和一个“软”层的自旋阀。为了实现低切换场，软层具有低磁化和低磁晶各向异性是有利的。满足这些标准的一类候选材料是具有低Fe浓度的Pd $_{1-x}$ Fe $_{x}$合金系统。我们目前的研究微米级的椭圆形约瑟夫森结包含Pd $_{97}$ Fe $_{3}$层的厚度变化。通过施加一个外部磁场，结的临界电流被发现遵循特征夫琅和费模式。从Fraunhofer图案中提取的临界电流的最大值作为铁磁屏障厚度的函数振荡，指示在零值和$π$值之间跨越结的相位差的转变。
英文摘要：
Josephson junctions with ferromagnetic layers are vital elements in a new class of cryogenic memory devices. One style of memory device contains a spin valve with one "hard" magnetic layer and one "soft" layer. To achieve low switching fields, it is advantageous for the soft layer to have low magnetization and low magnetocrystalline anisotropy. A candidate class of materials that fulfills these criteria is the Pd$_{1-x}$Fe$_{x}$ alloy system with low Fe concentrations. We present studies of micron-scale elliptically-shaped Josephson junctions containing Pd$_{97}$Fe$_{3}$ layers of varying thickness. By applying an external magnetic field, the critical current of the junctions are found to follow characteristic Fraunhofer patterns. The maximum value of the critical current, extracted from the Fraunhofer patterns, oscillates as a function of the ferromagnetic barrier thickness, indicating transitions in the phase difference across the junction between values of zero and $π$.
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