Amorphous Cr-Ti Texture-inducing Layer Underlying (002) Textured bcc-Cr alloy Seed Layer for FePt-C Based Heat-assisted Magnetic Recording Media Jeon, Seong-Jae; Hinata, Shintaro; Saito, Shin;
amorphous texture-inducing layers (TIL) were investigated to realize highly (002) oriented FePt-C granular films through hetero-epitaxial growth on the (002) textured bcc- seed layer (bcc-SL). As-deposited TILs showed the amorphous phase in Ti content of . Particularly, films with kept the amorphous phase against the heat treatment over . It was found that preference of the crystallographic texture for bcc-SLs is directly affected by the structural phase of TILs. (002) crystallographic texture was realized in bcc-SLs deposited on the amorphous TILs (), whereas (110) texture was formed in bcc-SLs overlying on crystalline TILs (x < 30 and x > 70). Correlation between the angular distribution of (002) crystal orientation of bcc-SL evaluated by full width at half maximum of (002) diffraction (FWHM) and a grain diameter of bcc-SL indicated that while the development of the lateral growth for bcc-SL grain reduces FWHM, crystallization of amorphous TILs hinders FWHM. FePt-C granular films were fabricated under the substrate heating process over with having different FWHM of bcc-SL. Hysteresis loops showed that squareness () of the films increased from 0.87 to 0.95 when FWHM of bcc-SL decreased from to . It is suggested that the reduction of (002) FWHM affects to the overlying MgO film as well as FePt-C granular film by means of the hetero-epitaxial growth.
amorphous Cr-Ti texture inducing layer;bcc-Cr alloy seed layer;lateral grain growth;hetero-epitaxial growth; FePt-C granular film;angular distribution of c-axis;
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