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Controlling the crystallographic orientation in ultrathin L10 FePt(111) films on MgO(111) underlayer

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4 Author(s)
Jae-Yoon Jeong ; Dept. of Phys., Hanyang Univ., Seoul, South Korea ; Jung-Gi Kim ; Seung-Young Bae ; Kyung-Ho Shin

Controlling the crystallographic orientation in ultrathin FePt longitudinal media for ultrahigh recording density is discussed with introducing sputtered MgO(111) underlayers selected as a template for inducing (111) texture in the FePt films. The MgO(111) underlayers significantly enhanced the crystallographic texture of FePt(111) for films as thin as 10 nm or less. Full width at half maximum (FWHM) of FePt(111) reflection measured from XRD rocking curves and coercivity squareness (S*) confirmed the strong in-plane texture of the FePt films deposited on MgO(111) underlayers. FWHM and S* were 8° and 0.8, respectively. High coercivity of 3200 Oe could be achieved in films with very low Mrt of 0.3 memu/cm2 at moderate annealing temperature (⩽500°C) which retained small grains

Published in:

IEEE Transactions on Magnetics  (Volume:37 ,  Issue: 4 )