Open AccessStructure and magnetic properties of FePt/Ag nano-granular films with perpendicular magnetic anisotropy
Author(s) -
Baohe Li,
Hwang Pol,
Tao Yang,
Chun Feng,
Zhai Zhong-Hai,
Fangyuan Zhu
Publication year - 2005
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.54.3867
Subject(s) - remanence , materials science , coercivity , annealing (glass) , demagnetizing field , condensed matter physics , magnetic anisotropy , magnetization , nuclear magnetic resonance , analytical chemistry (journal) , composite material , magnetic field , chemistry , physics , quantum mechanics , chromatography
FePt 2 nm/Ag d nm10 (d=0—11) multilayers were prepared on single crystal MgO(100) substrates kept at room temperature and 250 ℃ by means of magnetosputtering. L10-FePt/Ag granular films with perpendicular magn etic anis otropy and high coercivity have been obtained after vacuum annealing the multila yers deposited on substrates kept at 250 ℃ for 15 min. X-ray diffraction result s indicate that FePt particles have a strong 001 orientation. The size of Fe Pt particles decreases with the increase of the thickness of Ag layer. After vac uum annealing the FePt 2 nm/Ag 9 nm10 films at 600 ℃ for 15 min, FePt /Ag granular films are obtained with only 8 nm of particle size and 692 kA/m of coercivity. Isothermal magnetization remanence and dc-demagnetization remanence measurements show that no magnetic exchange coupling between magnetic particles can be observed. Such a kind of films is suitable for future ultra-density perp endicular magnetic recording medium.