# Bias-free reconfigurable magnonic phase shifter based on a spin-current controlled ferromagnetic resonator

## TL;DR

This paper introduces a reconfigurable, bias-free magnonic phase shifter controlled by spin-current in a ferromagnetic resonator, enabling dynamic phase modulation without magnetic bias fields, and demonstrates its application in magnonic logic gates.

## Contribution

The work presents a novel spin-current controlled magnonic phase shifter that operates without magnetic bias, enhancing reconfigurability and integration in magnonic circuits.

## Key findings

- The phase shifter can produce a π-phase shift or no shift based on magnetization state.
- The device functions as a dynamic phase shifter or spin-wave valve depending on input current.
- An XNOR magnonic logic gate is successfully demonstrated using the phase shifter.

## Abstract

Controllable phase modulation plays a pivotal role in the researches of magnonic logic gates. Here we propose a reconfigurable spin-current controlled magnonic phase shifter based on a ferromagnetic resonator. The proposed phase shifter requires no magnetic bias field during operation. The device is directly configured over the waveguide while keeping the original structure of the waveguide unaffected. Numerical micromagnetic simulations show that the phase shifter could yield either a {\pi}-phase or no shift depending on the magnetization status of the resonator, which can be controlled by a current pulse. Moreover, the phase-shifting operation could be affected by spin current. At different input current density, the device could be either used as a dynamic controlled phase shifter or a spin-wave valve. Finally, a XNOR magnonic logic gate is demonstrated using the proposed phase shifter. Our work can be a beneficial step to enhance the functionality and compatibility of the magnonic logic circuits.