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Domain Wall Motion and the Interfacial Dzyaloshinskii-Moriya Interaction in Pt/Co/RuO2(Ru) Multilayers
Milad Jalali1, Kai Wang2, Haoxiang Xu1
1School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.
Materials (Basel, Switzerland)
|September 13, 2025
Summary
The interfacial Dzyaloshinskii-Moriya interaction (DMI) in ultrathin magnetic films is crucial for spintronic devices. Researchers studied domain wall dynamics in RuO2-capped multilayers, finding altered spin-orbit interactions and enhanced DMI, paving the way for advanced spintronics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Spintronics
Background:
- The interfacial Dzyaloshinskii-Moriya interaction (DMI) is vital for stabilizing chiral spin textures in magnetic films, essential for spintronic applications.
- Understanding domain wall (DW) dynamics is key to controlling these textures for next-generation devices.
Purpose of the Study:
- To investigate the impact of RuO2 integration on DMI and domain wall dynamics in Ta/Pt/Co/Ru(O2)/Pt multilayers.
- To compare the magnetic properties and DW behavior of RuO2-capped films with control stacks.
Main Methods:
- Fabrication of Ta/Pt/Co/Ru(O2)/Pt multilayers using magnetron sputtering.
- Characterization using vibrating sample magnetometry (VSM) for magnetic properties and polar magneto-optical Kerr effect (P-MOKE) for coercivity.
- Domain wall visualization via Kerr microscopy and spin wave propagation analysis using Brillouin light scattering (BLS) spectroscopy.
- Micromagnetic simulations to corroborate experimental findings.
Main Results:
- The Pt/Co/RuO2 system exhibited a DMI constant of ~1.08 mJ/m², higher than Pt/Co/Ru (~1.03 mJ/m²) and significantly higher than Pt/Co (~0.23 mJ/m²).
- RuO2-capped films displayed pronounced domain wall velocity asymmetry under in-plane fields, unlike the symmetric behavior in Pt/Co/Pt.
- Despite lower depinning fields, Ru-capped samples showed faster domain wall motion, indicating reduced pinning.
Conclusions:
- Integrating RuO2 into Pt/Co multilayers significantly modifies interfacial spin-orbit interactions.
- The enhanced DMI and altered domain wall dynamics in RuO2-containing films show promise for advanced spintronic device applications.
- RuO2 integration offers a pathway to tune magnetic properties for improved device performance.
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