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The relationship between interface structure, conformality and perpendicular anisotropy in CoPd multilayers
A S H Rozatian1, C H Marrows, T P A Hase
1Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK.
Summary
Interface structure significantly impacts perpendicular anisotropy in cobalt/palladium multilayers. Non-conformal roughness increases with thickness, potentially reducing anisotropy energy.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Cobalt/palladium (Co/Pd) multilayers are crucial for magnetic storage technologies.
- Understanding interface structure is key to optimizing magnetic properties like perpendicular anisotropy.
Purpose of the Study:
- To investigate the relationship between interface structure and perpendicular anisotropy in sputtered Co/Pd multilayers.
- To quantify how interface morphology changes with the number of Co/Pd bilayers.
Main Methods:
- Grazing incidence x-ray scattering (GIXS) to probe interface structure.
- Vibrating sample magnetometry (VSM) to measure magnetic anisotropy.
- Analysis using a self-affine fractal model for interface characterization.
Main Results:
- Interface roughness becomes non-conformal as the number of bilayers increases.
- In-plane correlation length of roughness follows a power-law dependence on multilayer thickness.
- A decrease in fractal dimension correlates with an increase in surface anisotropy.
Conclusions:
- Loss of interface conformality, indicated by short out-of-plane correlation, may explain reduced anisotropy energy at higher bilayer counts.
- Interface fractal dimension is weakly associated with anisotropy, but lower fractal dimensions suggest higher surface anisotropy.
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