Memory Effect and Triplet Pairing Generation in the Superconducting Exchange Biased Co/CoOx/Cu41Ni59/Nb/Cu41Ni59 Layered Heterostructure

TL;DR

This study demonstrates a nanolayered superconductor-ferromagnet structure exhibiting a magnetic field-dependent resistive state, driven by exchange bias and triplet pairing, enabling bias-free logic states with significant resistance contrast.

Contribution

It introduces a novel layered heterostructure that leverages exchange bias and triplet pairing to achieve magnetic field-dependent resistive states without biasing.

Findings

Resistive state depends on magnetic field polarity.

High resistance difference of 90% at zero field.

Stable logic states without biasing in idle mode.

Abstract

We fabricated a nanolayered hybrid superconductor-ferromagnet spin-valve structure, the resistive state of which depends on the preceding magnetic field polarity. The effect is based on a strong exchange bias (about -2 kOe) on a diluted ferromagnetic copper-nickel alloy and generation of a long range odd in frequency triplet pairing component. The difference of high and low resistance states at zero magnetic field is 90% of the normal state resistance for a transport current of 250 {\mu}A and still around 42% for 10 {\mu}A. Both logic states of the structure do not require biasing fields or currents in the idle mode.