Amorphous Cr-Ti Texture-inducing Layer Underlying (002) Textured bcc-Cr alloy Seed Layer for FePt-C Based Heat-assisted Magnetic Recording Media

Abstract

Cr 100-x Ti x amorphous texture-inducing layers (TIL) were investigated to realize highly (002) oriented L1 0 FePt-C granular films through hetero-epitaxial growth on the (002) textured bcc-Cr 80 Mn 20 seed layer (bcc-SL). Asdeposited TILs showed the amorphous phase in Ti content of 30 ≤ x (at%) ≤ 75. Particularly, films with 40 ≤ x ≤ 60 kept the amorphous phase against the heat treatment over 600 o C. 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 (40 ≤ x ≤ 70), 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) 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.

Domain wall memory: Physics, materials, and devices

“…Researchers have also been working on paradigm shifts, such as using high anisotropy (Ku) media for storing information with smaller grain volume V. To combat the writing issues on high Ku media, heat-assisted magnetic recording (HAMR) technology [15][16][17][18] uses a laser source along with a writing head. The heating and the associated reduction in the coercivity of the media help in the writing process.…”