Answers are grounded in this paper and cite their sources.
The magnetic properties of deep submicron circular nanomagnets fabricated by high-resolution electron beam lithography from Supermalloy (Ni₈₀Fe₁₄Mo₅) have been studied as a function of both diameter (500--55 nm) and thickness (6--15 nm). A high sensitivity magneto-optical method has been used to measure the hysteresis loops of these nanomagnets. An experimental phase diagram in diameter and thickness has thus been produced which identifies a vortex phase and a single-domain phase. The two phases agree well with micromagnetic theory.
No takes yet. Share an insight, caveat, or question.
Cowburn et al. (1999) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: