Anomalous spin-triplet current in Ho/Co/Ho-based Josephson junctions

Wen, Lin; Jin, Li-Jing; Chen, Yu; Zha, Guo-Qiao; Zhou, Shi‐Ping

doi:10.1209/0295-5075/105/27007

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…It is also known that varying d F1 (= d F3 ) affects the magnitude of the m = 0 component in F 2 , but current experimental studies consider the case where this thickness is small, of the order of d F = ξ F to generate the maximal current. [3][4][5][14][15][16][17][18][19]35 Fig. 4 extends the scope of these studies to reveal an interesting new feature, that we term "depleted-triplet minima" (DTM) in the current seen at d F1 3.2ξ c and 5.9ξ c .…”

Section: B Effect Of Canting On the Josephson Currentmentioning

confidence: 82%

“…1 with F 2 ,F 3 ,F 4 aligned) is that with a judicious choice of layer thicknesses, the m = 0 components decay in amplitude to negligible values in the middle layer so that measured quantities are predominantly determined by m = 0 components. [3][4][5]8,9,[14][15][16][17][18][19][20] Recently, a calculation made for a pentalayer (5F) spin valve with π/2 orientation of the magnetization in F 2 , F 4 showed that m = 0 components are recovered far beyond one coherence length of an SF or FS interface. 21 An experimental test of the presence of these unexpected m = 0 correlations was proposed.…”

Section: Introductionmentioning

confidence: 99%

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Role of canting and depleted-triplet minima in superconducting spin valve structures

Baker

Bill

2018

Phys. Rev. B

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The trilayer and pentalayer spin valve structures are revisited to determine the behavior of pair correlations and Josephson current when the magnetic layers are canted at arbitrary angle. The two systems display markedly different behaviors in the center magnetic layer. While the trilayer generates a triplet component that is weakly affected by canting, the pentalayer tunes in singlet pair correlations depending heavily on canting. We also show that a minimum with depleted m = ±1 triplet components, rather than a 0 − π transition, may be observed in the current profile Ic(dF ) of a trilayer spin valve. The depleted-triplet minimum (DTM) is directly attributable to a decrease of m = ±1 triplet correlations with increased thickness of the central ferromagnet, accompanied by a hidden, simultaneous sign change of the Gor'kov functions contributed from the left and right superconductors. We introduce a toy model for superconducting-magnetic proximity systems to better illuminate the behavior of individual components of the Gor'kov function and compare with a full numerical calculation. arXiv:1802.08196v1 [cond-mat.supr-con]

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Section: B Effect Of Canting On the Josephson Currentmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Role of canting and depleted-triplet minima in superconducting spin valve structures

Baker

Bill

2018

Phys. Rev. B

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“…10,11 Experimental verification of the theoretical predictions showed that they play a crucial role in the detection of superconducting properties in wide ferromagnets. [12][13][14][15][16][17][18][19][20] We discuss fundamental properties of pair correlations in superconducting-magnetic hybrid systems in the diffusive regime. Of interest is the behavior of spin pair-correlations in various inhomogeneous magnetic heterostructures.…”

Section: Introductionmentioning

confidence: 99%

Publisher's Note: Classification of magnetic inhomogeneities and 0- π transitions in superconducting-magnetic hybrid structures [Phys. Rev. B 94 , 104518 (2016)]

Baker¹,

Richie-Halford²,

Bill³

2016

Phys. Rev. B

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We present a comparative study of pair correlations and currents through superconductingmagnetic hybrid systems with a particular emphasis on the tunable Bloch domain wall of an exchange spring. This study of the Gor'kov functions contrasts magnetic systems with domain walls that change at discrete points in the magnetic region with those that change continuously throughout. We present results for misaligned homogeneous magnetic multilayers, including spin valves, for discrete domain walls, as well as exchange springs and helical domain walls -such as Holmiumfor the continuous case. Introducing a rotating basis to disentangle the role of singlet and triplet correlations, we demonstrate that substantial amounts of (so-called short range) singlet correlations are generated throughout the magnetic system in a continuous domain wall via the cascade effect. We propose a classification of 0 − π transitions of the Josephson current into three types, according to the predominant pair correlations symmetries involved in the current. Properties of exchange springs for an experimental study of the proposed effects are discussed. The interplay between components of the Gor'kov function that are parallel and perpendicular to the local magnetization lead to a novel prediction about their role in a proximity system with a progressively twisting helix that is experimentally measurable.

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“…Similar dependence has been also demonstrated by the use of the Blonder-Tinkham-Klapwijk (BTK) approach. 33,34 In the mentioned theoretical works [32][33][34] the proximity effect at the CM/SC interface has been neglected meaning that the superconducting pair potential has been assumed to be a step function. However, as shown by recent studies, 35 only the self-consistent calculations of the tunneling conductance guarantees that the charge conservation law is satisfied.…”

Section: Introductionmentioning

confidence: 99%

Tunneling conductance through the half-metal/conical magnet/superconductor junctions in the adiabatic and non-adiabatic regimes: Self-consistent calculations

Wójcik

Zegrodnik

Rzeszotarski

et al. 2016

Physica E: Low-dimensional Systems and Nanostructures

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The tunneling conductance in the half-metal/conical magnet/superconductor (HM/CM/SC) is investigated by the use of the combined Blonder-Tinkham-Klapwijk (BTK) formalism and the Bogoliubov-de Gennes (BdG) equations. We show that the conductance calculated self-consistently differs significantly from the one calculated in the non-self-consistent framework. The use of the self-consistent procedure ensures that the charge conservation is satisfied. Due to the spin band separation in the HM, the conductance in the subgap region is mainly determined by the anomalous Andreev reflection the probability of which strongly depends on the spin transmission in the CM layer. We show that the spin of electron injected from the HM can be transmitted through the CM to the SC adiabatically or non-adiabatically depending on the period of the exchange field modulation. We find that the conductance in the subgap region oscillates as a function of the CM layer thickness wherein the oscillations transform from irregular, in the non-adiabatic regime, to regular in the adiabatic case. In the non-adiabatic regime the decrease of the exchange field amplitude in the CM leads to the emergence of the conductance peak for one particular CM thickness in agreement with experiment [J.W.A Robinson, J. D. S Witt and M. G. Blamire, Science 329, 5987]. For both transport regimes the conductance is analyzed over a broad range of parameters determining the spiral magnetization in the CM.

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Anomalous spin-triplet current in Ho/Co/Ho-based Josephson junctions

Cited by 6 publications

References 20 publications

Role of canting and depleted-triplet minima in superconducting spin valve structures

Role of canting and depleted-triplet minima in superconducting spin valve structures

Publisher's Note: Classification of magnetic inhomogeneities and 0- π transitions in superconducting-magnetic hybrid structures [Phys. Rev. B 94 , 104518 (2016)]

Tunneling conductance through the half-metal/conical magnet/superconductor junctions in the adiabatic and non-adiabatic regimes: Self-consistent calculations

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