Magnetic-coupling-dependent spin-triplet supercurrents in helimagnet/ferromagnet Josephson junctions

被引：36

作者：

Halasz, Gabor B. ^{[1
]}

Blamire, M. G. ^{[1
]}

Robinson, J. W. A. ^{[1
]}

机构：

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

FERROMAGNET; SUPERCONDUCTIVITY;

D O I：

10.1103/PhysRevB.84.024517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The experimental achievements during the past year in demonstrating the existence of long-ranged spin-triplet supercurrents in ferromagnets proximity coupled to singlet superconductors open up the possibility for new interesting physics and applications [for a review, see M. Eschrig, Phys. Today 64(1), 43 (2011]. Our group reported the injection of triplet supercurrents into a magnetically uniform ferromagnet (Co) by sandwiching it between two helimagnet/superconductor (Ho/Nb) bilayers to form a Nb/Ho/Co/Ho/Nb-type Josephson device. In the function of the Ho layer thicknesses, the supercurrent was found to modulate in a complex way that seemed to depend on the magnetic structure of Ho. To understand this unusual behavior, we have theoretically studied the properties of an ideal Josephson device with a helimagnet/ferrromagnet/helimagnet (HM/F/HM) barrier in the clean limit using the Eilenberger equation; we show, in particular, that the maximum triplet supercurrent that can pass across the barrier will depend nonmonotonically on the thicknesses of the HM layers if the HM and F layers are magnetically exchange coupled at their interface.

引用

页数：5

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