Columnar structured FePt films epitaxially grown on large lattice mismatched intermediate layer.
The microstructure and magnetic properties of the FePt films grown on large mismatched ZrN (15.7%) intermediate layer were investigated. With using ZrN intermediate layer, FePt 10 nm films exhibited (001) texture except for some weaker FePt (110) texture. Good epitaxial relationships of FePt (001) <100>//ZrN (001) <100>//TiN (001) <100> among FePt and ZrN/TiN were revealed from the transmission electron microscopy (TEM) results. As compared with TiN intermediate layer, although FePt-SiO2-C films grown on ZrN/TiN intermediate layer showed isotropic magnetic properties, the large interfacial energy and lattice mismatch between FePt and ZrN would lead to form columnar structural FePt films with smaller grain size and improved isolation. By doping ZrN into the TiN layer, solid solution of ZrTiN was formed and the lattice constant is increased comparing with TiN and decreased comparing with ZrN. Moreover, FePt-SiO2-C films grown on TiN 2 nm-20 vol.% ZrN/TiN 3 nm intermediate layer showed an improved perpendicular magnetic anisotropy. Simultaneously, columnar structure with smaller grain size retained.
School of Automation, China University of Geosciences, Wuhan 430074, China.|Department of Materials Science and Engineering, National University of Singapore, Singapore 117576, Singapore.
K F
KF
Dong
Department of Materials Science and Engineering, National University of Singapore, Singapore 117576, Singapore.
J Y
JY
Deng
Seagate Technology, Fremont, CA 94538, USA.
Y G
YG
Peng
Seagate Technology, Fremont, CA 94538, USA.
G
G
Ju
Department of Materials Science and Engineering, National University of Singapore, Singapore 117576, Singapore.
G M
GM
Chow
Department of Materials Science and Engineering, National University of Singapore, Singapore 117576, Singapore.
J S
JS
Chen
Phys Rev Lett. 1996 Nov 4;77(19):4046-4049
10062374
Sci Rep. 2014 Jul 08;4:5607
25001593