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首页> 外文期刊>Magnetics, IEEE Transactions on >Dependence of Magnetoresistance and Superconducting Transition Temperature on Relative Orientation of Magnetization Easy Axis to Current Direction in a Py/Nb/Py Trilayer
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Dependence of Magnetoresistance and Superconducting Transition Temperature on Relative Orientation of Magnetization Easy Axis to Current Direction in a Py/Nb/Py Trilayer

机译：Py / Nb / Py三层中磁阻和超导转变温度对磁化易轴相对于电流方向的相对取向的影响

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摘要

The magnetoresistance (MR) and the superconducting transition temperature $T_{rm c}$ as well as the longitudinal and the transverse magnetic moments are studied in order to find an underlying cause for the inverse spin switch behavior of bare Py/Nb/Py trilayers. Our measurements consistently show that the increase of MR and the decrease of $T_{rm c}$ in the case of the antiparallel alignment between the magnetizations of the two Py layers (AP state) compared to those in the parallel alignment (P state), which is known as the inverse spin switch behavior, are largely due to stray field from the domain walls in the domain state that occurs during the AP state. The influence of stray field on the MR and the $T_{rm c}$ shift between the AP and P state is measured in the bridges with each axis oriented at various angles $phi$ with respect to the magnetization easy axis. With increasing $phi$ from 0$^circ$ to 90$^circ$, $T_{rm c}$ shift between the AP and P state is almost constant around 5 mK up to $phi=54^circ$, then becomes 11 mK when $phi=72^circ$, but is reduced to 2 mK for $phi=90^circ$ . In addition, the effect by the stray field not originating in the domain walls is observed outside the domain states in the MR and in the transve-nrse magnetic moment measurements.
机译：研究了磁阻（MR）和超导转变温度$ T_ {rm c} $以及纵向和横向磁矩，以寻找引起Py / Nb / Py三层裸层自旋开关行为反转的根本原因。我们的测量一致地表明，与平行排列（P状态）相比，两个Py层磁化强度（AP状态）之间的反平行排列时，MR的增加和$ T_ {rm c} $的减小称为反向自旋开关行为，主要是由于在AP状态期间发生的域状态下，来自域壁的杂散场。在电桥中测量杂散场对MR的影响以及AP和P状态之间的$ T_ {rm c} $位移，其中每个轴相对于易磁化轴以不同角度$ phi $定向。随着$ phi $从0 $ ^ circ $增加到90 $ ^ circ $，AP和P状态之间的$ T_ {rm c} $偏移几乎恒定在5 mK左右，直到$ phi = 54 ^ circ $，然后变为当$ phi = 72 ^ circ $时为11 mK，但是对于$ phi = 90 ^ circ $降低为2 mK。此外，在MR和跨磁矩测量中，在磁畴状态之外观察到杂散磁场不起源于磁畴壁的影响。

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