Josephson magnetic rotary valve

TL;DR

This paper introduces a Josephson spin valve with a ferromagnetic layer that can be controlled via magnetic orientation, offering a simple, high-frequency, and clearly distinguishable state control mechanism.

Contribution

It proposes a novel Josephson device design incorporating a ferromagnetic layer and analyzes its operation through theoretical simulations.

Findings

High characteristic frequency demonstrated

Clear distinction between basic states achieved

Simple control mechanism validated

Abstract

We propose a control element for a Josephson spin valve. It is a complex Josephson device containing ferromagnetic (F) layer in the weak-link area consisting of two regions, representing $0$ and $\pi$ Josephson junctions, respectively. The valve's state is defined by mutual orientations of the F-layer magnetization vector and normal to the interface separating $0$ and $\pi$ sections of the device. We consider possible implementation of the control element by introduction of a thin normal metal layer in a part of the device area. By means of theoretical simulations we study properties of the valve's structure as well as its operation, revealing such advantages as simplicity of control, high characteristic frequency and good legibility of the basic states.