Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 49: POSTER II
MA 49.7: Poster
Donnerstag, 19. März 2015, 15:00–18:00, Poster A
Stabilization of L10 phase and suppression of twin structures in FePt-Cu nanoparticles — •Anna Elsukova, Marina Spasova, Mehmet Acet, and Michael Farle — Experimental Physics, Faculty of Physics and CENIDE, University of Duisburg - Essen, 47057 Duisburg, Germany
FePt alloy has a high value of magnetic anisotropy energy in the thermodynamically stable ordered L10 phase and, therefore, the FePt nanoparticles are expected to remain ferromagnetic at small sizes, which makes them a potential candidate for manufacturing magnetic storage devices with high areal density. However, due to the fact that particles’ preparation methods are kinetically controlled, the disordered magnetically soft A1 phase is stabilized instead and formation of metastable multi-twinned structures is observed.
In this work we report on the influence of Cu addition to the FePt on the stabilization of L10 phase and suppression of multi-twinned structures in small (around 6 nm) FePt-(Cu) gas-phase nanoparticles.
FePt-Cu nanoparticles with various concentrations of Cu were prepared by DC magnetron sputtering. The sputtering setup incorporates the furnace in order to anneal the particles in-flight prior to their deposition on a substrate. We have found that addition of Cu combined with in-flight annealing at 1273 K promotes the formation of single-crystalline L10 FePt-Cu particles in the gas-phase.