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We conducted a thorough experimental and numerical study of the micromagneticproperties of Permalloy (Ni$_{80}$Fe$_{20}$) microdisks exhibiting targetdomain structures at remanence. Vortex configurations are quite common in suchmicrodisks and correspond to an in-plane flux closure configuration ofcylindrical symmetry with an out-of-plane magnetized core. In contrast, targetdomain configuration are observed in thicker microdisks and are characterizedby a vortex configuration of the in-plane component of the magnetizationsuperposed to an out-of-plane component of magnetization which oscillates as afunction of the distance to the microdisk center resulting in the formation ofconcentric domains. The ratio of the out-of-plane oscillatory component of themagnetization to the in-plane vortex one increases with the thickness of themicrodisk. Hysteresis loops were measured under in-plane and out-of-planefield. The results at remanence and under magnetic field could be interpretedby micromagnetic simulations in which the microdisks were described as anassembly of partially coupled columns representing the granular nanostructureof the films from which the microdisks were patterned. Quite originalmagnetization processes take place in these microdisks exhibiting target domainremanent configuration. These include in particular entire flipping of thedomain configuration and annihilation/creation of ring domains.

Target domains in nanometric Permalloy disks with columnar structure