Anomalous Josephson effect in S/SO/F/S heterostructures

Minutillo, M.; Giuliano, Domenico; Lucignano, P.; Tagliacozzo, A.; Campagnano, Gabriele

doi:10.1103/physrevb.98.144510

Cited by 36 publications

(14 citation statements)

References 55 publications

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“…Several theoretical studies have shown that spin-orbit coupling can act to convert spin-singlet correlations into equal-spin triplet correlations, potentially removing the need for ferromagnetic spin-mixer layers in Josephson junctions [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Recent experimental studies show modification to the standard S -F proximity effect in the presence of additional spin-orbit coupling layers [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Supercurrent in ferromagnetic Josephson junctions with heavy-metal interlayers. II. Canted magnetization

2019

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It has been suggested by theoretical works that equal-spin triplet pair correlations can be generated in Josephson junctions containing both a ferromagnet and a source of spin-orbit coupling. Our recent experimental work suggested that such triplet correlations were not generated by a Pt spin-orbit coupling layer when the ferromagnetic weak link had entirely in-plane anisotropy (N. Satchell and N.O. Birge, Phys. Rev. B 97, 214509 (2018)). Here, we revisit the experiment using Pt again as a source for spin-orbit coupling and a [Co(0.4 nm)/Ni(0.4 nm)]×8/Co(0.4 nm) ferromagnetic weak link with both in-plane and out-of-plane magnetization components (canted magnetization). The canted magnetization more closely matches theoretical predictions than our previous experimental work. Our results suggest that there is no supercurrent contribution in our junctions from equal-spin triplet pair correlations. In addition, this work includes the first systematic study of supercurrent dependence on Cu interlayer thickness, a common additional layer used to buffer the growth of the ferromagnet and which for Co may significantly improve the growth morphology. We report that the supercurrent in the [Co(0.4 nm)/Ni(0.4 nm)]×8/Co(0.4 nm) ferromagnetic weak links can be enhanced by over two orders of magnitude by tuning the Cu interlayer thickness. This result has important application in superconducting spintronics, where large critical currents are desirable for devices.

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Section: Introductionmentioning

confidence: 99%

Supercurrent in ferromagnetic Josephson junctions with heavy-metal interlayers. II. Canted magnetization

2019

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“…Firstly we note that θ Φ /4 in Eq. (5) acts as a global phase which shifts the CPR, and manifests itself as an anomalous current at φ = 0 when TRS is broken [51][52][53] . For simplicity, in what follows we will limit ourselves to consider the fully symmetric case |X L | = |X R | = |X| and…”

Section: Josephson Currentmentioning

confidence: 99%

Manipulation of Cooper pair entanglement in hybrid topological Josephson junctions

et al. 2019

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In this work we investigate the supercurrent in a hybrid topological Josephson junction consisting of two planes of topological insulator (TI) in a specific configuration, which allows both local (LAR) and crossed (CAR) Andreev processes at the interfaces with two conventional s-wave superconductors. We describe the effects of gate voltage and magnetic flux controls applied to the edge states of each TI. In particular, we demonstrate that the voltage gating allows the manipulation of the entaglement symmetry of non-local Cooper pairs associated to the CAR process. We establish a connection between the Josephson current-phase relationship of the system and the action of the two external fields, finding that they selectively modify the LAR or the CAR contributions. Remarkably, we find that the critical current of the junction takes a very simple form which reflects the change in the symmetry occurred to the entangled state and allows to determine the microscopic parameters of the junction.

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“…In this paper, we recognize spin-mixing effects and lattice impurities as good candidates to approach this kind of task. Spin-orbit coupling (SOC) [32] have already been studied as a source of intriguing anomalous Josephson effect [33,34]. Moreover, it has been investigated in previous works [35] to induce the π − 0 transition in SFS JJs.…”

Section: Introductionmentioning

confidence: 99%

Realization of 0 - $π$ states in SFIS Josephson junctions. The role of spin-orbit interaction and lattice impurities

Minutillo,

Capecelatro,

Lucignano

2021

Preprint

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Josephson devices with ferromagnetic barriers have been widely studied. Much less is known when the ferromagnetic layer is insulating. In this manuscript we investigate the transport properties of superconductorferromagnetic insulator-superconductor (SFIS) junctions with particular attention to the temperature behavior of the critical current, that may be used as a fingerprint of the junction. We investigate the specific role of impurities as well as of possible spin mixing mechanisms, due to the spin orbit coupling. Transition between the 0 and the π phases can be properly tuned, thus achieving stable π junctions over the whole temperature range, that may be possibly employed in superconducting quantum circuits.

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Anomalous Josephson effect in S/SO/F/S heterostructures

Cited by 36 publications

References 55 publications

Supercurrent in ferromagnetic Josephson junctions with heavy-metal interlayers. II. Canted magnetization

Supercurrent in ferromagnetic Josephson junctions with heavy-metal interlayers. II. Canted magnetization

Manipulation of Cooper pair entanglement in hybrid topological Josephson junctions

Realization of 0 - $π$ states in SFIS Josephson junctions. The role of spin-orbit interaction and lattice impurities

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