Journal
PHYSICAL REVIEW B
Volume 90, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.020402
Keywords
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Funding
- U.K. EPSRC [EP/I011668/1, EP/I013520/1, EP/K003127/1, EP/J007110/1]
- Scottish Universities Physics Alliance
- University of Glasgow
- Engineering and Physical Sciences Research Council [EP/I013520/1, EP/J007110/1, 1367246, EP/I011668/1, EP/K003127/1] Funding Source: researchfish
- EPSRC [EP/I013520/1, EP/I011668/1, EP/J007110/1, EP/K003127/1] Funding Source: UKRI
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We investigate the Dzyaloshinskii-Moriya interactions (DMIs) in perpendicularly magnetized thin films of Pt/Co/Pt and Pt/Co/Ir/Pt. To study the effective DMI, arising at either side of the ferromagnet, we use a field-driven domain wall creep-based method. The use of only magnetic field removes the possibility of mixing with current-related effects such as spin Hall effect or Rashba field, as well as the complexity arising from lithographic patterning. Inserting an ultrathin layer of Ir at the top Co/Pt interface allows us to access the DMI contribution from the top Co/Pt interface. We show that the insertion of a thin Ir layer leads to reversal of the sign of the effective DMI acting on the sandwiched Co layer, and therefore continuously changes the domain wall structure from the right- to the left-handed Neel wall. The use of two DMI-active layers offers an efficient way of DMI tuning and enhancement in thin magnetic films. The comparison with an epitaxial Pt/Co/Pt multilayer sheds more light on the origin of DMI in polycrystalline Pt/Co/Pt films and demonstrates an exquisite sensitivity to the exact details of the atomic structure at the film interfaces.
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