Investigation of the crystallographic texture and interface roughness on CoCrPt /Ti magnetic thin films

Abstract

Role of Ag seed layer for CoCrPt/Ti perpendicular recording media J. Appl. Phys. 93, 7741 (2003); 10.1063/1.1540153Long-range order and short-range order study on CoCrPt/Ti films by synchrotron x-ray scattering and extended x-ray absorption fine structure spectroscopyThe structure and interface of Co 74 Cr 16 Pt 10 ͑40 nm thick͒/Ti ͑10 nm thick͒ films for perpendicular magnetic recording were studied using x-ray scattering and transmission electron microscopy. Improved out-of-plane coercivity and squareness resulted from the combined effects of higher crystallinity and better texture of the CoCrPt ͑002͒ film, and increased interface roughness. The relationship of sputtering pressure to the structural effects is discussed.

Magnetization reversal and exchange bias effects in hard/soft ferromagnetic bilayers with orthogonal anisotropies

“…This value is larger than the CoCrPt magnetization obtained from our hysteresis loops (M ave SAT ≈ (330 ± 20) emu cm −3 ) and close to that from the literature (≈350 emu cm −3 ) [36]. The origin of these discrepancies could be explained by the presence of amorphous interlayers between the CoCrPt and Ti seed layers, associated with the large lattice mismatch between the two elements and/or interdiffusion to form Co-Ti amorphous alloys [39,[62][63][64][65], and/or the existence of softer or even non-magnetic Cr-rich grain boundaries originated by Cr segregation to the grain boundaries of Co-rich grains [36].…”

“…We selected a Co-based alloy (Co 0.66 Cr 0.22 Pt 0.12 ) as the hard material with uniaxial magnetocrystalline anisotropy [36,37], which can be oriented out-of-plane by epitaxial growth onto a Ti (0001) underlayer. This alloy has been extensively studied for harddisk data storage applications [38,39]. We completed the exchange-coupled system with a Ni film as the soft layer.…”

Shape and strain-induced magnetization reorientation and magnetic anisotropy in thin film Ti/CoCrPt/Ti lines and rings

“…This alloy has been extensively studied for hard-disk datastorage applications. 54,55 Pt substitutes for Co in the hcp structure, increasing both the lattice constant and the magnetocrystalline anisotropy. 56,57 It is well known that patterning of a strained layer breaks the in-plane symmetry and produces an asymmetric strain relaxation, and changes the magnetoelastic anisotropy.…”