Title :
Perpendicular magnetic anisotropy and domain structure of L10-ordered FePt films fabricated by monatomic layer control
Author :
Shima, T. ; Moriguchi, T. ; Mitani, S. ; Takanashi, K. ; Ito, H. ; Ishio, S.
Author_Institution :
Inst. for Mater. Res., Tohoku Univ., Sendai, Japan
fDate :
9/1/2002 12:00:00 AM
Abstract :
Magnetic domain structures and perpendicular magnetic anisotropies for L10-ordered FePt alloy films have been investigated. The films were prepared by alternating Fe [001] and Pt [001] monatomic layers on MgO [001] substrates at low temperatures below 230°C. In addition to the fundamental [002] peak, [001] and [003] superlattice peaks have clearly been observed in the X-ray diffraction patterns, indicating the formation of an L10-ordered structure. The magnetization measurements show that all the samples are perpendicularly magnetized. Good magnetic squareness (Mr/Ms∼0.9) from the magnetization curves are obtained and highly interconnected stripe domain patterns are observed for the samples grown at Ts ≥ 160°C.
Keywords :
X-ray diffraction; electron beam deposition; ferromagnetic materials; iron alloys; magnetic domains; magnetic thin films; magnetisation; perpendicular magnetic anisotropy; platinum alloys; 120 to 230 C; FePt; L10-ordered FePt films; L10-ordered structure; MgO; MgO [001] substrates; UHV deposition system; X-ray diffraction patterns; [001] superlattice peaks; [003] superlattice peaks; alternating monatomic layers; domain structure; electron guns; fundamental [002] peak; highly interconnected stripe domain patterns; magnetic squareness; magnetization curves; monatomic layer control; perpendicular magnetic anisotropy; ultrahigh density recording; Iron; Magnetic anisotropy; Magnetic domains; Magnetic films; Magnetic force microscopy; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Substrates; Temperature; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.803102
