Direct observation of the Dzyaloshinskii-Moriya interaction in a Pt/Co/Ni film
Kai Di, Vanessa Li Zhang, Hock Siah Lim, Ser Choon Ng, Meng Hau Kuok,, Jiawei Yu, Jungbum Yoon, Xuepeng Qiu, and Hyunsoo Yang
TL;DR
This study directly measures the interfacial Dzyaloshinskii-Moriya interaction in a Pt/Co/Ni film using Brillouin spectroscopy, revealing asymmetries in magnon dispersion and lifetime that depend on frequency.
Contribution
It provides the first direct observation and quantitative evaluation of DMI in a Pt/Co/Ni film through magnon dispersion asymmetries.
Findings
DMI causes measurable asymmetry in magnon dispersion.
Magnon lifetime asymmetry increases with frequency.
Experimental results agree with analytical models.
Abstract
The interfacial Dzyaloshinskii-Moriya interaction (DMI) in an in-plane anisotropic Pt(4nm)/Co(1.6nm)/Ni(1.6nm) film has been directly observed by Brillouin spectroscopy. It is manifested in the asymmetry of the measured magnon dispersion relation, from which the DMI constant has been evaluated. Linewidth measurements reveal that the lifetime of the magnons is asymmetric with respect to their counter-propagating directions. The lifetime asymmetry is dependent on the magnon frequency, being more pronounced the higher the frequency. Analytical calculations of the magnon dispersion relation and linewidth agree well with experiments.
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