Title :
FePt-Ordered Alloy Films With (001) Orientation Fabricated With FeCoB Soft Magnetic Under Layer
Author :
Tanaka, Mitsuru ; Gomi, S. ; Ogata, Y. ; Nakagawa, Sachiko
Author_Institution :
Dept. of Phys. Electron., Tokyo Inst. of Technol., Tokyo, Japan
Abstract :
FePt films with (001) preferential orientations can be prepared on a thick MgO underlayer with (100) orientation formed on FeCoB soft magnetic underlayer (SUL) with (100) orientation. The Fe[3 nm]/Pt[3 nm] bilayer could be grown epitaxially on the MgO underlayer with (100) aligned texture and the bilayer transformed into (001)-textured L10-FePt films after annealing at 600°C. Perpendicular coercivity of 8.4 kOe was achieved on a thick MgO underlayer with (100) orientation formed on FeCoB SUL. In-plane M-H loop shows no magnetic anisotropy but it holds relatively soft magnetic properties. Coercitivities along easy and hard axis direction were 39 and 43 Oe, respectively.
Keywords :
annealing; boron alloys; cobalt alloys; coercive force; iron alloys; magnesium compounds; magnetic hysteresis; magnetic multilayers; magnetic thin films; perpendicular magnetic recording; platinum alloys; soft magnetic materials; sputter deposition; texture; (001) preferential orientations; (001)-textured L10-FePt films; (100) aligned texture; (100) orientation; Fe-MgO-FeCoB-MgO-Fe-Pt; Fe-Pt bilayer; FeCoB soft magnetic underlayer; FePt-ordered alloy films; annealing; easy axis direction; hard axis direction; in-plane M-H loop; perpendicular coercivity; relatively soft magnetic properties; temperature 600 degC; thick MgO underlayer; Annealing; Epitaxial growth; Iron; Magnetic anisotropy; Perpendicular magnetic recording; Substrates; $L 1_{0}$-FePt; FeCoB; MgO; perpendicular recording; soft underlayer (SUL);
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2011.2157111
