Structural order related to the magnetic anisotropy in epitaxial (111) CoPt3 alloy films

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

“…We observed strong growth induced uniaxial perpendicular magnetic anisotropy which has a maximum of 3.2ϫ10 6 erg/cm 3 and coercivity of about 200 Oe for films with thicknesses Ͻ6 nm. At a thickness larger than 6 nm the easy magnetization axis progressively rotates into the plane of the film as the film thickness is increased.…”

“…Owing to their strong perpendicular magnetic anisotropy ͑PMA͒ they are potential materials for high-density magneto-optical recording. 1,2 In fcc Co x Pt 1Ϫx films PMA has various causes such as growth-induced heterogeneity, 2 compressive strain, 3 short-range order driven by surface segregation, [3][4][5] or magnetically induced phase separation, 5 but is not linked to the appearance of any chemical long-range ordered phase. In this context, the ordered CoPt 3 phase ͑L1 2 -type͒ shows no PMA due to its cubic symmetry.…”

CoPt alloy grown on the WSe2(0001) van der Waals surface

“…This effect was also observed in thin CoPt 3 (1 1 1) films grown on Pt(1 1 1) and Ru(0 0 0 1) at elevated deposition temperatures of about 690 K just before long-range L1 2 -type chemical ordering sets in Refs. [12,13]. The presence of the out-of-plane anisotropy was also found in CoPt(1 1 1) films grown on Ru(0 0 0 1) [14].…”

Magnetocrystalline anisotropy in (111) CoPt3 thin film with growth-induced chemical anisotropy investigated by x-ray magnetic circular dichroism

“…1 Recently, strong perpendicular magnetic anisotropy ͑as large as 10 7 erg cm Ϫ3 ͒ as well as 100% perpendicular remanence has been observed in ͑111͒-oriented fcc CoPt 3 alloy films. 2,3 This was unexpected for a cubic lattice and was attributed to the existence of an anisotropic local chemical order. 3 MCA is known to be a microscopic effect, 4 but the evidence of MCA comes mainly from macroscopic measurements ͑either torque or magnetization͒.…”

“…2,3 This was unexpected for a cubic lattice and was attributed to the existence of an anisotropic local chemical order. 3 MCA is known to be a microscopic effect, 4 but the evidence of MCA comes mainly from macroscopic measurements ͑either torque or magnetization͒. 2,3 To demonstrate unambiguously the correlation between MCA and this growth-induced chemical anisotropy, angle-dependent x-ray magnetic circular dichroism measurements ͑XMCD͒ were performed at both the Co and Pt L 2,3 edges.…”