Depth dependent local structures in CoPt thin films

Depth-dependent chemical and magnetic local orders in thin magnetic films

Magnetic Properties of Nanostructured CoPt and FePt Thin Films

Polycrystalline MgO underlayer films lead to different preferred orientations of 10 CoPt and FePt films after the annealing process, depending on the thickness of 10 films. 10 films with a thickness greater than 20 nm revealed mostly 10 [100] fiber texture and consequently in-plane anisotropy as determined by magnetic hysteresis. Strong perpendicular anisotropy due to the 10 [001] fiber texture...

Spatially modulated magnetic structures in thin films

The axial next–nearest neighbour Ising (ANNNI) model is studied for thin films of up to L = 10 layers, with a distinct phase diagram for each film thickness. The systematics of the ordered phases, as obtained from mean–field theory, Monte Carlo simulations, and low temperature expansions, is discussed. Results are compared to those for the ANNNI model in the limit L −→ ∞. PACS numbers: 68.35.Rh...

Magneto-Electric Control of Surface Anisotropy and Nucleation Modes in L10-CoPt Thin Films

The interplay between electric field-controlled surface magnetic anisotropy and micromagnetic nucleation modes for L10-CoPt thin films is investigated with density-functional and micromagnetic model calculations. The electric field redistributes electron states near the Fermi level, which has a fairly strong effect on the surface anisotropy, but due to inversion symmetry, the net anisotropy of ...

Atomic Ordering and Coercivity Mechanism in FePt and CoPt Polycrystalline Thin Films

40 nm thick CoPt and FePt films were prepared on oxidized Si substrates with 10 nm MgO underlayers. The maximum coercivity ( ) for CoPt films was found to be 10 kOe after annealing at 700 C for 20–30 minutes (min). Structural analysis showed a significant amount of FCC phase as well as the ordered L10 phase in these films. FePt films showed an abrupt increase of ordered volume fraction and in t...