Preferentially Oriented Growth of L10FePt on Si Substrate

Abstract

Preferentially Oriented Growth of L10 FePt on Si Substrate N. Kaushik, P. Sharma, S. Tanaka, A. Makino and M. Esashi WPI-AIMR, Tohoku University, Sendai, Japan Institute for Materials Research, Tohoku University, Sendai, Japan Graduate School of Engineering, Tohoku University, Sendai, Japan Tilting the magnetic easy axis of L10 FePt and/or introducing a magnetic bu er layer is most e ective in realizing the L10 based magnetic recording media. Here we report on preferentially oriented growth of L10 FePt with tilted magnetic easy axis. FePt lms of thickness up to 170 nm were deposited on Si substrate with a soft magnetic underlayer of glassy FeSiB, FeSiBP and CoFeTaB. E ects of processing conditions on the structural and magnetic properties were studied. A polycrystalline growth of FePt (i.e. mixed orientation) was observed with the underlayer of FeSiB and FeSiBP, but CoFeTaB promotes preferentially oriented growth along (111) crystallographic direction. Compared to FePt lms grown on Si substrate, coercivity (Hc) reduces signi cantly with the introduction of soft magnetic underlayer. The magnetic easy axis of (111) L10 FePt is tilted 36 out of plane and it is very promising for tilted magnetic recording media.