Half-metallic superconducting triplet spin multivalves

被引：45

作者：

Alidoust, Mohammad ^{[1
]}

Halterman, Klaus ^{[2
]}

机构：

[1] KN Toosi Univ Technol, Dept Phys, Tehran 158754416, Iran

[2] Naval Air Warfare Ctr, Phys Div, Michelson Lab, China Lake, CA 93555 USA

来源：

PHYSICAL REVIEW B | 2018年 / 97卷 / 06期

关键词：

FERROMAGNET; HETEROSTRUCTURES; LAYERS;

D O I：

10.1103/PhysRevB.97.064517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study spin switching effects in finite-size superconducting multivalve structures. We examine F1F2SF3 and F1F2SF3F4 hybrids where a singlet superconductor (S) layer is sandwiched among ferromagnet (F) layers with differing thicknesses and magnetization orientations. Our results reveal a considerable number of experimentally viable spin-valve configurations that lead to on-off switching of the superconducting state. For S widths on the order of the superconducting coherence length xi(0), noncollinear magnetization orientations in adjacent F layers with multiple spin axes leads to a rich variety of triplet spin-valve effects. Motivated by recent experiments, we focus on samples where the magnetizations in the F-1 and F-4 layers exist in a fully spin-polarized half-metallic phase, and calculate the superconducting transition temperature, spatially and energy resolved density of states, and the spin-singlet and spin-triplet superconducting correlations. Our findings demonstrate that superconductivity in these devices can be completely switched on or off over a wide range of magnetization misalignment angles due to the generation of equal-spin and opposite-spin triplet pairings.

引用

页数：11

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