Long-range spin-triplet proximity effect in Josephson junctions with multilayered ferromagnets

Luka Trifunovic; Zoran Radović

doi:10.1103/physrevb.82.020505

Long-range spin-triplet proximity effect in Josephson junctions with multilayered ferromagnets

Physical Review B ◽

10.1103/physrevb.82.020505 ◽

2010 ◽

Vol 82 (2) ◽

Cited By ~ 40

Author(s):

Luka Trifunovic ◽

Zoran Radović

Keyword(s):

Long Range ◽

Proximity Effect ◽

Josephson Junctions ◽

Spin Triplet

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Spin-sensitive long-range proximity effect in ferromagnet/spin-triplet-superconductor bilayers

Physical Review B ◽

10.1103/physrevb.83.060508 ◽

2011 ◽

Vol 83 (6) ◽

Cited By ~ 26

Author(s):

Gaetano Annunziata ◽

Mario Cuoco ◽

Canio Noce ◽

Asle Sudbø ◽

Jacob Linder

Keyword(s):

Long Range ◽

Proximity Effect ◽

Spin Triplet

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Spin-triplet supercurrents in Josephson junctions containing strong ferromagnetic materials

Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rsta.2015.0150 ◽

2018 ◽

Vol 376 (2125) ◽

pp. 20150150 ◽

Cited By ~ 12

Author(s):

Norman O. Birge

Keyword(s):

Proximity Effect ◽

Josephson Junctions ◽

Bound States ◽

Ferromagnetic Material ◽

Ferromagnetic Materials ◽

Normal Metal ◽

Pair Correlations ◽

Spin Singlet ◽

Triplet Pair ◽

Spin Triplet

The proximity effect between a superconducting material and a non-superconducting normal metal can extend over distances of the order of micrometres at sufficiently low temperatures. If the normal metal is replaced by a ferromagnetic material, the spatial extent of the proximity effect drops precipitously due to the exchange splitting between the majority and minority spin bands in the ferromagnet. In 2001, several theorists predicted that spin-triplet pair correlations could be induced in proximity systems involving multiple ferromagnetic materials (or multiple domains in one material) with non-collinear magnetizations. Such spin-triplet pair correlations should extend deep into the ferromagnet, producing a long-range proximity effect. In this paper, we review our experimental work in this area, which has focused primarily on Josephson junctions containing strong ferromagnetic materials. We show that Josephson junctions containing particular combinations of strong ferromagnetic materials can carry spin-triplet supercurrent over distances of at least several tens of nanometres, whereas spin-singlet supercurrent in similar samples decays over a length scale of about 1 nm. We also mention important work by other groups; however, this article is not intended to be a review of the whole field. This article is part of the theme issue ‘Andreev bound states’.

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