Magnetization reversal by superconducting current in φ Josephson junctions

Abstract

We study magnetization reversal in a ϕ 0 Josephson junction with direct coupling between magnetic moment and Josephson current. Our simulations of magnetic moment dynamics show that by applying an electric current pulse, we can realize the full magnetization reversal. We propose different protocols of full magnetization reversal based on the variation of the Josephson junction and pulse parameters, particularly, electric current pulse amplitude, damping of magnetization and spin-orbit interaction. We discuss experiments which can probe the magnetization reversal in ϕ 0 -junctions.

User Software for Numerical Study of Josephson Junction with Magnetic Momenta

“…Excellent qualitative and quantitative agreement between our simulations and the simulations in [4] has been obtained. The instant in Fig.…”

“…To verify the correctness of the USJJS, we recovered all the numerical results from [4]. Excellent qualitative and quantitative agreement between our simulations and the simulations in [4] has been obtained.…”

“…Using this software one can compute accurate values of some important physical parameters of the system under electric current pulse. We show that our method can demonstrate a magnetization reversal effect [4]. This effect is very important for superconducting spintronics and could be useful in the frame of applications in the quantum computing field [1].…”

“…Here S is superconductor and F -ferromagnetic. moment and phase difference in the SFS JJ is described by the following problem [4] of four ordinary first-order differential equations with initial conditions in dimensionless form:…”

Magnetization-induced dynamics of a Josephson junction coupled to a nanomagnet

“…More recently, several theoretical studies have been carried out on a variety of aspects of such systems including effect of superconducting correlations on the spin dynamics of the nanomagnet 24 , the influence of spin-orbit coupling of a single spin on the Josephson current 25 , and the effect of deposition of single magnetic molecules on superconducting quantum interference devices(SQUIDs) made out of such junctions 26 . Another interesting phenomenon which has been widely studied in this context is magnetization switching [27][28][29] which constitutes magnetization reversal of the nanomagnet by a externally driven JJ. In addition, the possibility of a Josephson current to induce exchange interaction between ferromagnetic layers has been studied in Ref.…”