Non-reciprocity of spin wave propagation induced by the interface Dzyaloshinskii-Moriya interaction in Py/Pt film structures

TL;DR

This study investigates how interface Dzyaloshinskii-Moriya interactions in Py/Pt films cause non-reciprocal spin wave propagation, revealing unconventional wave behavior and estimating the interaction strength.

Contribution

It provides a comprehensive experimental analysis of non-reciprocal spin wave behavior induced by IDMI in Py/Pt bilayers, including quantitative estimation of the interaction constant.

Findings

Observation of non-reciprocal spin wave propagation in Py/Pt films.

Quantitative estimation of the effective IDMI constant D.

Identification of unconventional wave behavior related to interface DMI.

Abstract

Results of a comprehensive study by means of Brillouin spectroscopy, complemented by Ferromagnetic Resonance characterization, of spin waves (SW) propagating in Py/Pt bi-layers, characterized by pronounced interface Dzyaloshinskii-Moriya interactions (IDMI) are reported. Non-conventional wave behavior of SW travelling in opposite directions, characterized by non-reciprocity with respect to the inversion of the sign of the SW wave-number, has been revealed. The value of the effective IDMI constant D has been estimated.