Influence of magnetic domain size on dipolar interactions and hysteresis field asymmetry in layered high/low coercivity perpendicular anisotropy systems
Résumé
Dipolar interactions in low-coercivity/Pd/high-coercivity [Co/Pd](X)/Pd/[Co/Pd](10) multilayer systems are studied as a function of the domain size in the [Co/Pd](X) low-coercivity layer (LCL), while maintaining the domain size in the high-coercivity layer (HCL) constant. As the number of repeats X increases from 5 to 30, the mean domain size of the [Co/Pd](X) LCL decreases from hundreds of micron to hundreds of nanometers. After demagnetization, different regimes can be distinguished from partial or exact domain duplication for LCL domain size larger than HCL one to uncorrelated behavior for much smaller LCL domains. The results obtained via magnetic force microscopy allow understanding the symmetry and asymmetry versus externally applied field as observed in macroscopic magnetometry measurements.
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