TEM: High resolution cross view:
Figure 15.09: Cross-sectional TEM image of FePt based double-layered perpendicular recording media [5].
Figure 15.09 shows the role of thin SiO2 layer on top of FeTaC soft layer to control the growth of the MgO into a particular direction. Left image shows the growth of MgO as amorphous like structure and right images shows the MgO(200) structure after the introduction of 2 nm SiO2 on top of FeTaC layer [5].
Ref.[5]. A. Perumal et al, J. Appl. Phys. 108 (2010) 083907.