Magnetic exchange interaction induced by a Josephson current

Waintal, Xavier; Brouwer, Piet W.

doi:10.1103/physrevb.65.054407

Cited by 96 publications

(140 citation statements)

References 32 publications

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“…Note that in addition to the non-equilibrium spin current, there can exist an equilibrium one which in the context of magnetic multilayers is often referred as the interlayer exchange (RKKY type) coupling [48][49][50][51] .…”

Section: A Landauer Buttiker Approach To Magnetic Multilayersmentioning

confidence: 99%

Multiscale approach to spin transport in magnetic multilayers

et al. 2011

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This article discusses two dual approaches to spin transport in magnetic multilayers: a direct, purely quantum, approach based on a Tight-Binding model (TB) and a semiclassical approach (Continuous Random Matrix Theory, CRMT). The combination of both approaches provides a systematic way to perform multi-scales simulations of systems that contain relevant physics at scales larger (spin accumulation, spin diffusion...) and smaller (specular reflexions, tunneling...) than the elastic mean free paths of the layers. We show explicitly that CRMT and TB give consistent results in their common domain of applicability.

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Section: A Landauer Buttiker Approach To Magnetic Multilayersmentioning

confidence: 99%

Multiscale approach to spin transport in magnetic multilayers

et al. 2011

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“…Various theoretical predictions have been made for J C enhancement in the case of S/F/X/F/S Josephson junctions, when the F layers have their moments switched from parallel to antiparallel, with large effects for X = insulator (I), [9,10,11], more weakly in the case of X = normal (dirty) metal (N) [12]. Spin torque on the F layers due to the Josephson current has been predicted for X = N [13]. To achieve these 'spin-active' junctions, techniques can be borrowed from the magnetics community in the fabrication of spinvalve devices.…”

Section: Introductionmentioning

confidence: 99%

Proximity and Josephson effects in superconductor/antiferromagneticNb/γ−Fe50Mn50<

et al. 2003

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We study the proximity effect in superconductor (S), antiferromagnetic (AF) bilayers, and report the fabrication and measurement of the first trilayer S/AF/S Josephson junctions. The disordered f.c.c. alloy γ-Fe50Mn50 was used as the AF, and the S is Nb. Micron and sub-micron scale junctions were measured, and the scaling of JC (dAF ) gives a coherence length in the AF of 2.4 nm, which correlates with the coherence length due to suppression of TC in the bilayer samples. The diffusion constant for FeMn was found to be 1.7 × 10 −4 m 2 s −1 , and the density of states at the Fermi level was also obtained. An exchange biased FeMn/Co bilayer confirms the AF nature of the FeMn in this thickness regime.

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“…Furthermore, if a magnetic structure is contacted by two superconductors, the proximity effect may be present, leading to a finite Josephson current through the structure at equilibrium. The torques generated by this current correspond to an equilibrium effective exchange interaction between the magnetic moments which can be controlled by the phase difference between the superconductors [6]. The same mechanism enables the reciprocal effect in which the supercurrent depends on the magnetic configuration.…”

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Triplet Josephson Effect with Magnetic Feedback in a Superconductor-Ferromagnet Heterostructure

Braude

Blanter

2008

Phys. Rev. Lett.

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We study the ac Josephson effect in a superconductor-ferromagnet heterostructure with a variable magnetic configuration. The system supports triplet proximity correlations whose dynamics is coupled to the magnetic dynamics. This feedback dramatically modifies the behavior of the junction. The currentphase relation becomes double periodic at both very low and high Josephson frequencies ! J . At intermediate frequencies, the periodicity in ! J t may be lost. DOI: 10.1103/PhysRevLett.100.207001 PACS numbers: 74.78.Fk, 72.25.Ba, 74.50.+r Spin-dependent transport through hybrid structures combining ferromagnets (F) and normal metals has recently attracted a lot of interest, motivated by the prospect of potential technological applications in the field of spintronics [1]. Particular attention is given to two complementary effects involving mutual influence between electric current and magnetic configuration. The first is giant magnetoresistance [2] in which the conductance is much larger when different magnetic regions have their magnetic moments aligned than when they are antialigned. The opposite effect is the appearance of torques acting on magnetic moments when an electric current flows through the system [3]. These nonequilibrium current-induced torques appear due to nonconservation of spin currents accompanying a flow of charge through ferromagnetic regions. They allow manipulation of the magnetic configuration, including switching between the opposite directions or steady-state precession, without application of magnetic fields [4]. The two effects combined promise important practical applications in nonvolatile memory, programmable logic, and microwave oscillators.A conceptually different situation occurs when a ferromagnet is coupled to a superconductor (S), since the spin current through the superconducting part vanishes [5]. This additional constraint modifies the nonequilibrium torques, opening the possibility of perpendicular alignment of magnetic moments. Furthermore, if a magnetic structure is contacted by two superconductors, the proximity effect may be present, leading to a finite Josephson current through the structure at equilibrium. The torques generated by this current correspond to an equilibrium effective exchange interaction between the magnetic moments which can be controlled by the phase difference between the superconductors [6]. The same mechanism enables the reciprocal effect in which the supercurrent depends on the magnetic configuration.For a uniform ferromagnet, the observation of these effects requires a very thin magnetic layer, since the proximity effect is suppressed at short distances. However, in nonuniform ferromagnets, a long-range proximity effect can exist due to triplet superconducting correlations [7]. This triplet proximity effect (TPE) strongly enhances the associated Josephson current. It is important that TPE essentially depends on the magnetic configuration of the system [7]. Hence S/F multilayers exhibiting TPE are especially suitable for studying the Josephson-ind...

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Magnetic exchange interaction induced by a Josephson current

Cited by 96 publications

References 32 publications

Multiscale approach to spin transport in magnetic multilayers

Multiscale approach to spin transport in magnetic multilayers

Proximity and Josephson effects in superconductor/antiferromagneticNb/γ−Fe50Mn50<

Triplet Josephson Effect with Magnetic Feedback in a Superconductor-Ferromagnet Heterostructure

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