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Asymmetric ferromagnet-superconductor-ferromagnet switch

机译:非对称铁磁体-超导体-铁磁体开关

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摘要

In layered ferromagnet-superconductor-ferromagnet (F_1/S/F_2) structures, the critical temperature T_c of the superconductors depends on the magnetic orientation of the ferromagnetic layers F_1 and F_2 relative to each other. So far, the experimentally observed magnitude of change in T_c for structures utilizing weak ferromagnets has been 2 orders of magnitude smaller than is expected from calculations. We theoretically show that such a discrepancy can result from the asymmetry of F/S boundaries, and we test this possibility by performing experiments on structures where F_1 and F_2 are independently varied. Our experimental results indicate that asymmetric boundaries are not the source of the discrepancy. If boundary asymmetry is causing the suppressed magnitude of T_c changes, it may only be possible to detect in structures with thinner ferromagnetic layers.
机译:在层状铁磁体-超导体-铁磁体(F_1 / S / F_2)结构中,超导体的临界温度T_c取决于铁磁层F_1和F_2相对于彼此的磁取向。到目前为止,对于使用弱铁磁体的结构,实验观察到的T_c的变化幅度比计算得出的结果小2个数量级。我们从理论上证明这种差异可能是由F / S边界的不对称引起的,并且我们通过对F_1和F_2独立变化的结构进行实验来测试这种可能性。我们的实验结果表明,不对称边界不是差异的根源。如果边界不对称导致抑制的T_c变化幅度,则仅可能在具有较薄铁磁层的结构中进行检测。

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