Static and dynamic properties of 0,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>π</mml:mi></mml:math>, and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>0</mml:mn><mml:mtext>−</mml:mtext><mml:mi>π</mml:mi></mml:mrow></mml:math>ferromagnetic Josephson tunnel junctions

Pfeiffer, J.; Kemmler, M.; Koelle, D.; Kleiner, R.; Goldobin, E.; Weides, Martin; Feofanov, A. K.; Lisenfeld, Jürgen; Ustinov, A. V.

doi:10.1103/physrevb.77.214506

Cited by 77 publications

(77 citation statements)

References 44 publications

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“…Consequently one will observe I + c,R when the phase will later on escape from the R-well instead of I + c,L . In general, the damping in SIFS JJs is strongly temperature dependent and reduces for lower temperatures [45]. For our samples we estimated T = 3.60 K as the crossover temperature between the high and low damping regime (in a sense of observing both I c,LR 's).…”

Section: Resultsmentioning

confidence: 99%

TunableφJosephson junction ratchet

et al. 2016

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We demonstrate experimentally the operation of a deterministic Josephson ratchet with tunable asymmetry. The ratchet is based on a ϕ Josephson junction with a ferromagnetic barrier operating in the underdamped regime. The system is probed also under the action of an additional dc current, which acts as a counter force trying to stop the ratchet. Under these conditions the ratchet works against the counter force, thus producing a non-zero output power. Finally, we estimate the efficiency of the ϕ Josephson junction ratchet.

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Section: Resultsmentioning

confidence: 99%

TunableφJosephson junction ratchet

et al. 2016

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“…The proximity effect in s-wave superconductor/ferromagnetic metal (S/F) hybrid junctions has been extensively studied in the last decade because of its fascinating phenomena and potential applications to superconducting spintronics [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Magnetization induced by odd-frequency spin-triplet Cooper pairs in a Josephson junction with metallic trilayers

Hikino

Yunoki

2015

Phys. Rev. B

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We theoretically study the magnetization inside a normal metal induced in an s-wave superconductor/ferromagnetic metal/normal metal/ferromagnetic metal/s-wave superconductor (S/F1/N/F2/S) Josephson junction. Using the quasiclassical Green's function method, we show that the magnetization becomes finite inside the N . The origin of this magnetization is due to odd-frequency spin-triplet Cooper pairs formed by electrons of equal and opposite spins, which are induced by the proximity effect in the S/F1/N/F2/S junction. We find that the magnetiza-, where θ is the superconducting phase difference between the two Ss and d is the thickness of N . The θ independent magnetization M I (d) exists generally in S/F junctions, while M II (d, θ) carries all θ dependence and represents the fingerprint of the phase coherence between the two Ss in Josephson junctions. The θ dependence thus allows us to control the magnetization in the N by tuning θ for a fixed d. We show that the θ independent magnetization M I (d) weakly decreases with increasing d, while the θ dependent magnetization M II (d, θ) rapidly decays with d. Moreover, we find that the time-averaged magnetization M II (d, θ) exhibits a discontinuous peak at each resonance DC voltage Vn = n ωS/2e (n: integer) when DC voltage V as well as AC voltage vac(t) with frequency ωS are both applied to the S/F1/N/F2/S junction. This is because M II (d, θ) oscillates generally in time t (AC magnetization) with dθ/dt = 2e[V + vac(t)]/ and thus M II (d, θ) = 0, but can be converted into the time-independent DC magnetization for the DC voltage at Vn. We also discuss that the magnetization induced in the N can be measurably large in realistic systems. Therefore, the measurement of the induced magnetization serves as an alternative way to detect the phase coherence between the two Ss in Josephson junctions. Our results also provide a basic concept for tunable magnetization in superconducting spintronics devices.

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“…Josephson junction arrays, [4], stacked artificial Josephson junctions [5], intrinsic high-T c Bi 2 Sr 2 CaCu 2 O 8+x stacked superconducting tunnel junctions [6], high-T c Y Ba 2 Cu 3 O 7−δ bicrystal Josephson junction [7]. Recently, the Fiske steps have been investigated theoretically in 0 − π Josephson junctions [8] and they have been experimentally observed in 0−π Josephson tunnel junctions with ferromagnetic barrier [9].…”

Section: Introductionmentioning

confidence: 99%