Fizika Nizkikh Temperatur: Volume 45, Number 12 (December 2019), p. 1473-1479    ( to contents , go back )

Microwave induced tunable subharmonic steps in superconductor–ferromagnet–superconductor Josephson junction

M. Nashaat1,2, Yu.M. Shukrinov2,3, A. Irie4, A.Y. Ellithi1, and Th.M. El Sherbini1

1Department of Physics, Cairo University, Cairo, 12613, Egypt
E-mail: majed@sci.cu.edu.eg

2BLTP, JINR, Dubna, Moscow Region, 141980, Russian Federation

3Dubna State University, Dubna, 141982, Russian Federation
E-mail: shukrinv@theor.jinr.ru

4Department of Electrical and Electronic Systems Engineering Utsunomiya University, Utsunomiya, Japan

Received September 2, 2019, published online October 25, 2019

Abstract

We investigate the coupling between ferromagnet and superconducting phase dynamics in superconductor–ferromagnet–superconductor Josephson junction. The current-voltage characteristics of the junction demonstrate a pattern of subharmonic current steps which forms a devil’s staircase structure. We show that a width of the steps becomes maximal at ferromagnetic resonance. Moreover, we demonstrate that the structure of the steps and their widths can be tuned by changing the frequency of the external magnetic field, ratio of Josephson to magnetic energy, Gilbert damping and the junction size.

Key words: Josephson junction, ferromagnetic resonance, Landau–Lifshitz Gilbert equation

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