Isolation of proximity-induced triplet pairing channel in a superconductor/ferromagnet spin valve
Isolation of proximity-induced triplet pairing channel in a superconductor/ferromagnet spin valve
复制标题
DOI：
10.1103/physrevb.93.100502
复制
发表时间：
2015-10
期刊：
影响因子：
--
通讯作者：
P. Leksin;N. Garif’yanov;A. Kamashev;A. Validov;Y. Fominov;J. Schumann;V. Kataev;J. Thomas;B. Buchner;I. Garifullin
中科院分区：
文献类型：
--
作者：
P. Leksin;N. Garif’yanov;A. Kamashev;A. Validov;Y. Fominov;J. Schumann;V. Kataev;J. Thomas;B. Buchner;I. Garifullin
本文研究了CoOx /Py_1/Cu/Py_2/Cu/Pb自旋阀结构（其中Py = Ni_（0：81）Fe_（0：19））中的邻近诱导超导三重态配对。对于CoOx（3 nm）/Py（3 nm）/Cu（4 nm）/Py（0.6nm）/Cu（2nm）/Pb（70 nm），我们研究了Tc与冷却场方向和外场方向之间的夹角α的关系。我们得到的Tc不随角度单调变化，但通过一个极小值。为了观察“孤立的”三重态自旋阀效应，我们利用了普通自旋阀效应ΔTc的幅度与Py 2层厚度dPy 2的关系的振荡特征。我们确定了dPy 2的值，在该值下，由普通自旋阀效应引起的ΔTc被抑制。这意味着Py 1和Py 2层的磁化的反平行和平行相互取向之间的Tc差为零。对于这样的样品的“纯”三重态自旋阀效应，导致最低的Tc在正交配置的磁化已被观察到。
In the present work we have studied the proximity-induced superconducting triplet pairing in CoOx /Py1/Cu/Py2/Cu/Pb spin-valve structure (where Py = Ni0:81 Fe0:19 ). For CoOx (3 nm)/Py(3 nm)/Cu(4 nm)/Py(0.6 nm)/Cu(2 nm)/Pb(70 nm) we have studied the dependence of the Tc on the angle α between the direction of the cooling field and the external field both applied in the plane of the sample. We obtained that the Tc does not change monotonically with the angle but passes through a minimum. To observe an “isolated” triplet spin-valve effect we exploited the oscillatory feature of the magnitude of the ordinary spin-valve effect ΔTc in the dependence of the Py2-layer thickness dPy2 . We determined the value of dPy2 at which ΔTc caused by the ordinary spin-valve effect is suppressed. This means that the difference in the Tc between the antiparallel and parallel mutual orientation of magnetizations of the Py1 and Py2 layers is zero. For such a sample a “pure” triplet spin-valve effect which causes the minimum in Tc at the orthogonal configuration of magnetizations has been observed.