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Long range triplet Josephson current and 0−π transitions in tunable domain walls

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Long range triplet Josephson current and 0−π transitions in tunable domain walls
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The order parameter of superconducting pairs penetrating an inhomogeneous magnetic material can acquire a long range triplet component (LRTC) with non-zero spin projection. This state has been predicted and generated in proximity systems and Josephson junctions. We show, using a realistic domain wall of an exchange spring bilayer, how the LRTC emerges and can be tuned with the twisting of the magnetization. We also introduce a new kind of Josephson current reversal, the singlet-LRTC 0–π transition, that can be observed in one and the same system either by tuning the domain wall or by varying temperature.

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electrons inside of a superconductor form Cooper pairs if another material is placed near the
superconductor the whole system becomes superconducting by proximity many interesting effects may be seen if that material is ferrimagnetic as a single Cooper-pair will acquire an orbital
angular momentum and transition to a triplet via the fully deferral locking up G. call effect already in the exchange field if the magnetization profile is inhomogeneous and then the chocolate may have a component protected from the magnetization by symmetry and propagate over long distances through the magnet as though it were a normal metal this is called the long-range triple component of the order parameter in
this paper we study the Josephson current through a tunable exchange spring which may be of interest for measurement and applications but also allows us to explore new physics and exchange frames is
constructed from 2 magnets that are magnetically linked at 0 field the magnetization profile is homogeneous applying an X that magnetic field induces a partial domain wall which made the round up or down until the field is sufficiently large to return to the homogeneous configuration but in the opposite direction the tunable reversible spring-like nature of the magnetization is why the magnet is called in exchange for a we suggest to
realistic exchange springs to study the effects of the domain wall on the Josephson current the 1st is a wide COBOL permalloy system we display the current as a function of the twist dulcify of the domain wall as the twist is increased along the X. axis the measurable current increases shown as a solid line the appearance of the current is attributable to the long-range triplet component that increases with increasing twist of the domain wall of noteworthy is also the presence of a financing the contribution to the current shown as a dashed line despite the very wide magnetic system considered here this is due to the cascading proximity effect in a continuously rotating magnetization the inset shows that as 1 increases the thickness of the exchange brings the current decreases since the domain knowledge is flattened a 2nd system
nickel 3 manganese nickel is much softer than the previous cobalt permalloy which introduces a sizable single current across the system again shown as a dashed line we're drawn to the curious consequence of this as 0 pi transition shown as a V-shaped solid line the system is too wide for the boost in bully ASCII type transition measured in homogeneous firms to appear further this 0 pi transition presented in a paper on the spin valve by Hussein Bustan cannot apply here either since the single contribution is negligible in a spin valve system of similar thickness what we see here is a new type of 0 pi transition the long-range triplet components always try the currently in 1 direction that we call negative by convention the single contribution to the current from the superconductor is also present due to the weakness of the ferromagnet and modified by the cascade effect the thickness of the layer is chosen so that the with contribution to the current is in the positive direction in this sample at the point where the same that counterbalances the other components no current is measured contrastingly the inset figure shows the node disappears if we increase the thickness of the exchange spring changing the direction of the singlet pairs suggestions are
made for realizing the experiments proposed in the paper and the temperature dependence is discussed thank you very much for listening