Perpendicular magnetic anisotropy in CoPt3(111) films grown on a low energy surface at room temperature

Abstract

Roles of L10 ordering in controlling the magnetic anisotropy and coercivity of (111)-oriented CoPt ultrathin continuous layers in CoPt/AlN multilayer films

Influence of external magnetic fields on the growth of alloy nanoclusters

“…We remark that these measurements also appear to justify the bond model implied by (2), when two different interfacial orientations are compared. For (111) interfaces the anisotropy energy per surface area is found about twice as large as for the (100) orientation.…”

“…Co-moments µ in (2) are then aligned along the [111] direction, which introduces an asymmetry in the probabilities for jumps that form or break CoPt-bonds. For in-plane bonds, (2) gives no contribution, whereas the energy of an out-of-plane Co-Pt bond is changed from…”

“…The figure includes the case A = 0, represented by open symbols. This data formally corresponds to zero magnetic field, because for B = 0 at the temperatures considered the Co-moments µ are oriented randomly so that (2) gives no contribution to P . The important observation is that P (N, A) for fixed N significantly increases with A.…”

“…Clearly, the expected magnetic field effects on growth are small in view of the smallness of the magnetic anisotropy parameter A in (2). To obtain reliable results for the change in the structural anisotropy parameter P with and without the field, we have carried out simulations including several much larger parameters A up to A = 1.…”

“…It has recently been shown that CoPt 3 ultrathin films and nanoclusters, grown by molecular beam epitaxy (MBE), display perpendicular magnetic anisotropy (PMA) with potential applications in high density magnetic storage media [1,2,3]. Previous simulations of CoPt 3 nanocluster growth on a weakly interacting substrate suggested that PMA originates from the combined effects of Pt surface segregation and cluster shape [4,5].…”