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Correlation between Dzyaloshinskii-Moriya interaction and orbital angular momentum at an oxide-ferromagnet interface
Hans T Nembach1,2, Emilie Jué2,3, Eric R Evarts2
1JILA, University of Colorado, Boulder, Colorado 80309, USA.
Physical Review. B
|July 10, 2024
Summary
Oxides can generate Dzyaloshinskii-Moriya (DMI) interaction at ferromagnet interfaces. This study shows oxides enhance DMI, correlating it with orbital momentum, highlighting interface effects.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- The Dzyaloshinskii-Moriya interaction (DMI) is crucial for spintronic devices.
- Understanding DMI at interfaces is key to controlling magnetic chirality.
- Oxide interfaces are increasingly explored for novel magnetic phenomena.
Purpose of the Study:
- To experimentally demonstrate DMI at ferromagnet-oxide interfaces.
- To investigate how oxide layers influence and enhance DMI.
- To correlate DMI with electronic properties at the interface.
Main Methods:
- Fabrication and characterization of Pt/CoFe/oxide and Cu/CoFe/oxide heterostructures.
- Experimental measurement of DMI using comparative analysis of magnetic systems.
- Ferromagnetic resonance (FMR) spectroscopy to probe DMI and spectroscopic splitting factor.
Main Results:
- Oxide layers were shown to induce and contribute to DMI.
- Oxidation of an interface enhanced the total DMI, adding to the effect from a platinum interface.
- Both interfaces promoted left-handed chirality.
- A correlation was observed between DMI and the spectroscopic splitting factor (g-factor).
Conclusions:
- Oxides are a viable source of DMI at magnetic interfaces.
- Interface engineering with oxides can tune and enhance DMI.
- Hybridization and charge transfer at oxide interfaces play a significant role in DMI generation.
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