Domain walls and long-range triplet correlations in SFS Josephson junctions

Buzdin, Alexandre I.; Mel’nikov, A. S.; Pugach, N. G.

doi:10.1103/physrevb.83.144515

Cited by 50 publications

(56 citation statements)

References 32 publications

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“…Expression (19) reproduces the well-known result previously obtained for single-domain SIFS structures [16]- [18] thereby demonstrating the independence of the critical current on the orientation of the domains magnetization vectors, if they are collinear oriented and the FF interface is fully opaque for electrons.…”

supporting

confidence: 79%

Josephson effect in SIFS tunnel junctions with domain walls in the weak link region

et al. 2015

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We study theoretically the properties of SIFS type Josephson junctions composed of two superconducting (S) electrodes separated by an insulating layer (I) and a ferromagnetic (F) film consisting of periodic magnetic domains structure with antiparallel magnetization directions in neighboring domains. The two-dimensional problem in the weak link area is solved analytically in the framework of the linearized quasiclassical Usadel equations. Based on this solution, the spatial distributions of the critical current density, JC , in the domains and critical current, IC, of SIFS structures are calculated as a function of domain wall parameters, as well as the thickness, dF , and the width, W, of the domains. We demonstrate that IC(dF , W ) dependencies exhibit damped oscillations with the ratio of the decay length, ξ1, and oscillation period, ξ2, being a function of the parameters of the domains, and this ratio may take any value from zero to unity. Thus, we propose a new physical mechanism that may explain the essential difference between ξ1 and ξ2 observed experimentally in various types of SFS Josephson junctions.

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supporting

confidence: 79%

Josephson effect in SIFS tunnel junctions with domain walls in the weak link region

et al. 2015

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“…ÇÑAEÐÑÓÑAEÐÑÇ ÑÃÏÇÐÐÑÇ ÒÑÎÇ h, ÔÑÊAEÂÐÐÑÇ AEÑÏÇÐÐÑÌ ÔÕÓÖÍÕÖÓÑÌ ×ÇÓÓÑÏÂÅÐÇÕËÍÂ, ÏÑÉÇÕ ÔÒÑÔÑÃÔÕÄÑÄÂÕß ÔÑØ-ÓÂÐÇÐËá ÔÄÇÓØÒÓÑÄÑAEËÏÑÔÕË Ä FS-ÅËÃÓËAEÂØ Ë Ä ÖÔÎÑÄËâØ, ÔÑÑÕÄÇÕÔÕÄÖáÜËØ ÚËÔÕÑÏÖ ÒÓÇAEÇÎÖ, ÍÑÅAEÂ ØÂÓÂÍÕÇÓÐÂâ AEÎËÐÂ ÔÄÑÃÑAEÐÑÅÑ ÒÓÑÃÇÅÂ àÎÇÍÕÓÑÐÑÄ Ä ×ÇÓÓÑÏÂÅÐÇÕËÍÇ ÊÂÏÇÕÐÑ ÒÓÇÄÞÛÂÇÕ ÇÅÑ ÓÂÊÏÇÓÞ [9,20]. ³ÑÊAEÂÄÂÇÏÖá ÑÃÏÇÐÐÞÏ ÒÑÎÇÏ AEÇÔÕÓÖÍÕËÄÐÖá ÓÂÊÐÑÔÕß ×ÂÊ g ÏÑÉÐÑ ÔÖÜÇÔÕÄÇÐÐÑ ÖÏÇÐßÛËÕß ËÎË AEÂÉÇ ÔAEÇÎÂÕß ÓÂÄÐÑÌ ÐÖÎá, ÇÔÎË ÐÂÒÓÂÄÎÇÐËÇ ÑÃÏÇÐÐÑÅÑ ÒÑÎâ ËÊÏÇÐâÇÕÔâ ÄAEÑÎß ÍÄÂÊËÍÎÂÔÔËÚÇÔÍÑÌ ÕÓÂÇÍÕÑÓËË [9].…”

Section: ¥âîßðñAeçìôõäöáüëì Aeéñêç×ôñðñäôíëì õóâðôòñóõ úçóçê ×çóóñïâåunclassified

“…³ÑÊAEÂÄÂÇÏÖá ÑÃÏÇÐÐÞÏ ÒÑÎÇÏ AEÇÔÕÓÖÍÕËÄÐÖá ÓÂÊÐÑÔÕß ×ÂÊ g ÏÑÉÐÑ ÔÖÜÇÔÕÄÇÐÐÑ ÖÏÇÐßÛËÕß ËÎË AEÂÉÇ ÔAEÇÎÂÕß ÓÂÄÐÑÌ ÐÖÎá, ÇÔÎË ÐÂÒÓÂÄÎÇÐËÇ ÑÃÏÇÐÐÑÅÑ ÒÑÎâ ËÊÏÇÐâÇÕÔâ ÄAEÑÎß ÍÄÂÊËÍÎÂÔÔËÚÇÔÍÑÌ ÕÓÂÇÍÕÑÓËË [9]. ±ÑÎÐÂâ ÍÑÏÒÇÐÔÂÙËâ [9,20,29]. £ àÕÑÏ ÔÎÖÚÂÇ ÐÂÃÇÅË ×ÂÊ ÒÓË ÃÂÎÎËÔÕËÚÇÔÍÑÏ ÒÓÑ-ÎÈÕÇ ÍÂÉAEÑÅÑ ËÊ ÔÎÑÈÄ g 1Y 2 ÓÂÊÎËÚÂáÕÔâ ÕÑÎßÍÑ ÊÐÂÍÑÏ:…”

Section: ¥âîßðñAeçìôõäöáüëì Aeéñêç×ôñðñäôíëì õóâðôòñóõ úçóçê ×çóóñïâåunclassified

Long-range ballistic transport mechanisms in superconducting spintronics

Самохвалов¹,

Mel’nikov²,

Buzdin³

2016

Usp. Fiz. Nauk

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£ÂÉÐÞÏ ÄÑÒÓÑÔÑÏ AEÎâ ÓÇÂÎËÊÂÙËË ÏÇØÂÐËÊÏÂ AEÂÎß-ÐÑAEÇÌÔÕÄËâ âÄÎâÇÕÔâ ÔÒÑÔÑÃ ÍÑÐÄÇÓÔËË ÔËÐÅÎÇÕÐÞØ ÍÖÒÇ-ÓÑÄÔÍËØ ÒÂÓ 45 À 54, ÑÃÓÂÊÖáÜËØÔâ Ä ÔÄÇÓØÒÓÑÄÑAEÐËÍÇ, Ä ÕÓËÒÎÇÕÐÞÇ ÒÂÓÞ 45 54, 44 ¥Îâ ÑÒËÔÂÐËâ ÒÓÑÙÇÔÔÂ ÓÂÔÔÇâÐËâ ÍÖÒÇÓÑÄÔÍËØ ÒÂÓ Ô ËÊÏÇÐÇÐËÇÏ ËØ ÔÒËÐÑÄÑÅÑ ÔÑÔÕÑâÐËâ ÖAEÑÃÐÑ ÄÄÇÔÕË ÐÑÄÞÇ ×ÖÐÍÙËË f AE f s AE f tx , ÑÃÓÂÊÑÄÂÐÐÞÇ ËÊ ÍÑÏÒÑ-ÐÇÐÕ ÂÐÑÏÂÎßÐÑÌ ×ÖÐÍÙËË ¤ÓËÐÂ f. ¶ÖÐÍÙËË f AE ÑÒËÔÞ-ÄÂáÕ ÒÂÓÞ Ô ÐÖÎÇÄÑÌ ÔÖÏÏÂÓÐÑÌ ÒÓÑÇÍÙËÇÌ ÔÒËÐÂ ÐÂ ÑÔß ÍÄÂÐÕÑÄÂÐËâ Ë ÑÃÓÂÜÈÐÐÑÌ (ËÐÄÇÓÕËÓÑÄÂÐÐÑÌ) ÔÒËÐÑÄÑÌ ÔÕÓÖÍÕÖÓÑÌ: 45 Ë 54. ¬ÂÍ ÑÕÏÇÚÂÎÑÔß, ÔÖÏÏÂÓÐÞÌ ËÏÒÖÎßÔ ÔËÐÅÎÇÕÐÑÌ ÒÂÓÞ " hq " hk 4 À " hk 5 ÐÇ ÓÂÄÇÐ ÐÖÎá ËÊ-ÊÂ ÑÃÏÇÐÐÑÅÑ ÓÂÔÜÇÒÎÇÐËâ ÔÒËÐÑÄÞØ ÒÑAEÊÑÐ (jk 4 j b jk 5 j Ë jqj $ 1ax h ). µÓÂÄÐÇÐËâ ¿ÌÎÇÐÃÇÓÅÇÓÂ AEÎâ ×ÖÐÍÙËÌ f AE ÔÖÜÇÔÕÄÇÐÐÑ ÖÒÓÑÜÂáÕÔâ, ÇÔÎË ÑÃÏÇÐÐÑÇ ÒÑÎÇ ÑAEÐÑ-ÓÑAEÐÑ Ë ÐÂÒÓÂÄÎÇÐÑ ÄAEÑÎß ÑÔË ÍÄÂÐÕÑÄÂÐËâ x:ÔÑAEÇÓÉËÕ ÔÎÂÅÂÇÏÑÇ a À b a2, Ä ÍÑÕÑÓÑÏ "ÃÞÔÕÓÂâ" ÊÂÄËÔËÏÑÔÕß ÑÕ ÖÅÎÂ y ÑÕÔÖÕÔÕÄÖÇÕ. ³ØÇÏÂÕËÚÐÑ ÒÓÑÙÇÔÔ ÓÂÔÔÇâÐËâ àÎÇÍÕÓÑÐÑÄ, ÑÃÓÂÊÖá-ÜËØ ÍÖÒÇÓÑÄÔÍÖá ÒÂÓÖ, ÐÂ ÐÇÑAEÐÑÓÑAEÐÑÔÕË ÑÃÏÇÐÐÑÅÑ ÒÑÎâ ÒÑÍÂÊÂÐ ÐÂ ÓËÔ. 5. £ ÊÂÄËÔËÏÑÔÕË ÑÕ ÒÂÓÂÏÇÕÓÑÄ AEÑÏÇÐÂ d 2 cÖÏÏÂÓÐÞÌ ËÏÒÖÎßÔ ÔËÐÅÎÇÕÐÑÌ ÒÂÓÞ " hq ÒÓË ÕÂÍÑÏ ÓÂÔÔÇâÐËË ÏÑÉÇÕ ËÎË ÑÔÕÂÕßÔâ ÐÇËÊÏÇÐÐÞÏ,ÂÍËÏ ÑÃÓÂÊÑÏ, ÔËÐÅÎÇÕÐÂâ ÍÑÏÒÑÐÇÐÕÂ f s ÂÐÑ-ÏÂÎßÐÑÌ ×ÖÐÍÙËË ¤ÓËÐÂ Ä ×ÇÓÓÑÏÂÅÐÇÕËÍÇ Ô ÎÑÍÂÎË-ÊÑÄÂÐÐÑÌ ÐÇÑAEÐÑÓÑAEÐÑÔÕßá ÑÃÏÇÐÐÑÅÑ ÒÑÎâ Ä ÔÇÓÇ- We present a review of mechanisms responsible for the long-range Josephson transport in ballistic hybrid structures superconductor/ ferromagnet/superconductor (SFS) with the exchange éeld modulated either in coordinate or momentum space. These mechanisms are based on the suppression of the destructive interference of electronic and hole waves in the ferromagnet caused by the exchange éeld. The interference suppression results in the slow decay of the singlet component of the pair correlation function in a ferromagnet and increase in the Josephson current in SFS structures.

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“…75,76 It is possible that the domaingenerated magnetization non-uniformities in the LSMO films could lead to additional modulations of the I c (H) dependences. However, based on the data in Fig.…”

Section: Magneto-field Dependencesmentioning

confidence: 99%

Magnetic proximity effect and superconducting triplet correlations at the cuprate superconductor and oxide spin valve interface

Ovsyannikov

Constantinian

Демидов

et al. 2016

Low Temperature Physics

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A heterostructure consisting of a cuprate superconductor YBa 2 Cu 3 O 7-d and a ruthenate/manganite (SrRuO 3 /La 0.7 Sr 0.3 MnO 3 ) spin valve was studied using SQUID magnetometry, ferromagnetic resonance, and neutron reflectometry. It is shown that because of the magnetic proximity effect a magnetic moment is excited in the superconducting portion of the heterostructure, whereas the magnetic moment in the spin valve becomes suppressed. The experimentally obtained value of a typical penetration depth of a magnetic moment into the superconductor is significantly greater than the coherence length of the cuprate superconductor, which indicates that the induced magnetic moment mechanism of Cu atoms is dominant. The mesastructure prepared by adding niobium film as a second superconducting electrode to the existing heterostructure, exhibited a superconducting current (dc Josephson effect) at interlayer thicknesses that are much greater than the coherence length of the ferromagnetic materials. The maximum of the critical current density dependence on the thickness of the spin valve material corresponds to the interlayer coherence length, which agrees with the theoretical predictions associated with spin-triplet pairing. The superconducting current is observed at magnetic fields that are two orders of magnitude greater than the field corresponding to the occurrence of one magnetic flux quantum in the mesastructure. The ratio of the second harmonic of the current-phase dependence of the mesastructure superconducting current to the first, determined according to the dependence of the Shapiro steps on the amplitude of microwave exposure, did not exceed 50%. Published by AIP Publishing. [http://dx

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Domain walls and long-range triplet correlations in SFS Josephson junctions

Cited by 50 publications

References 32 publications

Josephson effect in SIFS tunnel junctions with domain walls in the weak link region

Josephson effect in SIFS tunnel junctions with domain walls in the weak link region

Long-range ballistic transport mechanisms in superconducting spintronics

Magnetic proximity effect and superconducting triplet correlations at the cuprate superconductor and oxide spin valve interface

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