Abstract
L10 FePt films were deposited on MgO (001) substrates heated to 700°C by magnetron sputtering. Assisted by the misfit of lattice between film and substrate, strong (001) texture was formed. The film at nominal thickness tN = 5 nm was composed of nanoparticles with a size of ∼70 nm, and showed a high coercivity of ∼105 kOe at 4.2 K. At tN =∼50 nm, as the film changed from discontinuous to continuous, the coercivity dropped about one order of magnitude. Micromagnetic simulation implies that the magnetization reversal is a vortex-like nuclear type. The ideal coercivity of a separated single-domain L10 FePt nanoparticle with a size of 70 nm× 70 nm× 5 nm is ∼121 kOe. This tells us that the experimental coercivity has nearly reached the limit of ideal single crystalline nanoparticles.
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