Coercivity Control of FePt Nanoparticles by Interfacial Disorder

Abstract

Thin disordered layer can be formed by sputter-deposition of alumina on fully ordered L1₀ FePt nanoparticle assembly, due to plasma damage. The thickness of the disordered layer can be tuned by the sputtering power and deposition time of the alumina target. This partial disordering causes substantial decrease in the coercivity, which may be effective to adjust very high switching field of L1₀ FePt to practical magnetic recording systems.