Low-temperature deposition of L10 FePt films for ultra-high density magnetic recording |
| |
Authors: | JS Chen BC Lim YF Ding GM Chow |
| |
Institution: | 1. Data Storage Institute, DSI Building, 5 Engineering Drive 1, Singapore 117608, Singapore;2. Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore |
| |
Abstract: | A method based on strain-induced phase transformation was used to lower the ordering temperature of FePt films. The strain resulted from the lattice mismatch between the FePt film and the substrate or underlayer favored the ordering. The relationships between the lattice mismatch, the ordering of FePt film, and the corresponding magnetic anisotropic constant were investigated. A critical lattice mismatch near 6.33% was believed to be most suitable for improving the chemical ordering of the FePt films. CrX (X=Ru, Mo, W, Ti) alloys with (2 0 0) texture was used to control the easy axis and ordering temperature of FePt films on glass substrate. Large uniaxial anisotropy constant Ku?1×107 erg/cm3, good magnetic squareness (∼1) and FePt(0 0 1) texture (rocking curve −5°) were obtained at the temperature Ts?250 °C when using CrRu underlayer. The diffusion from overlying layers of Ag and Cu and an inserted Ag pinning layer were effective in reducing the exchange decoupling and changing the magnetization reversal. The media noise was effectively reduced and the SNR was remarkably enhanced when a 2 nm Ag was inserted. |
| |
Keywords: | FePt Perpendicular media Strain Underlayer |
本文献已被 ScienceDirect 等数据库收录! |
|