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arXiv 0903.0044cond-mat.supr-con
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超导自旋阀中逆自旋开关效应的起源

Origin of the Inverse Spin Switch Effect in Superconducting Spin Valves

J. Zhu, X. Cheng, C. Boone, I. N. Krivorotov

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5 pages, 4 figures
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摘要：

铁磁体/超导体/铁磁体（F/S/F）自旋阀在其超导转变温度$T_c$附近的电阻取决于F层的磁化状态。这种现象被称为自旋开关效应（SSE），其本身表现为F层的平行（$R_P$）和反平行（$R_{AP}$）配置之间的电阻差。在不同的超导自旋阀系统中都观察到了标准（$R_{P}>R_{AP}$）和逆（$R_{P}<R_{AP}$）SSE，但逆SSE的起源还不清楚。本文报道了在Ni $_{81}$ Fe $_{19}$ /Nb/Ni $_{81}$ Fe $_{19}$ /Ir $_{25}$ Mn $_{75}$自旋阀中观察到的标准和逆SSE共存现象。我们的测量结果表明，逆SSE来自于F层中静磁耦合Néel畴壁对的杂散磁场诱导的耗散涡旋流。

英文摘要：

The resistance of a ferromagnet/superconductor/ferromagnet (F/S/F) spin valve near its superconducting transition temperature, $T_c$, depends on the state of magnetization of the F layers. This phenomenon, known as spin switch effect (SSE), manifests itself as a resistance difference between parallel ($R_P$) and antiparallel ($R_{AP}$) configurations of the F layers. Both standard ($R_{P}>R_{AP}$) and inverse ($R_{P}<R_{AP}$) SSE have been observed in different superconducting spin valve systems, but the origin of the inverse SSE was not understood. Here we report observation of a coexistence of the standard and inverse SSE in Ni$_{81}$Fe$_{19}$/Nb/Ni$_{81}$Fe$_{19}$/Ir$_{25}$Mn$_{75}$ spin valves. Our measurements reveal that the inverse SSE arises from a dissipative flow of vortices induced by stray magnetic fields from magnetostatically coupled Néel domain wall pairs in the F layers.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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