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Net Dzyaloshinskii-Moriya interaction in defect-enriched ferromagnet
Yifan Quan1, Jakob Steiner1, Boning Li2
1Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.
Summary
The Dzyaloshinskii-Moriya interaction (DMI) was observed in Vitroperm due to lattice defects. Experimental tilting revealed this DMI asymmetry arises from specific spin-flip scattering differences.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Neutron Scattering
Background:
- The Dzyaloshinskii-Moriya interaction (DMI) typically requires broken inversion symmetry.
- Lattice defects can induce DMI in symmetric materials, as seen in Vitroperm.
- Previous studies observed DMI-induced asymmetry in Vitroperm's small-angle neutron scattering (SANS).
Purpose of the Study:
- To experimentally investigate the origin of DMI-induced asymmetry in Vitroperm.
- To explore potential causes of asymmetry by tilting the sample in an external magnetic field.
- To confirm the source of the asymmetric DMI signal using spin-filtered analysis.
Main Methods:
- Polarized small-angle neutron scattering (SANS) on nanocrystalline Vitroperm.
- Experimental tilting of the sample relative to the external magnetic field.
- Analysis of scattered neutrons using a polarized proton spin filter.
Main Results:
- The DMI-induced asymmetry in SANS cross sections was confirmed.
- Tilting the Vitroperm sample revealed dependencies related to the asymmetry.
- Spin-filtered analysis confirmed the asymmetric signal originates from spin-flip scattering differences.
Conclusions:
- The observed DMI asymmetry in Vitroperm is not random and indicates additional symmetry breaking.
- The asymmetry is linked to specific spin-flip scattering processes.
- Further investigation into the defect structure and its symmetry-breaking role is warranted.
Keywords:
Dzyaloshinskii–Moriya interactionmicromagnetic structurepolarized neutronsmall-angle neutron scatteringMore Related Videos
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