AVS 50th International Symposium
    Magnetic Interfaces and Nanostructures Wednesday Sessions
       Session MI-WeP

Paper MI-WeP4
Magnetic and Structural Properties of Fe@sub 3@Pt/Fe Thin Films

Wednesday, November 5, 2003, 11:00 am, Room Hall A-C

Session: Poster Session
Presenter: M.A.I. Nahid, Toyota Technological Institute, Japan
Authors: M.A.I. Nahid, Toyota Technological Institute, Japan
T. Suzuki, Toyota Technological Institute, Japan
Correspondent: Click to Email
Recently hcp phase of Fe@sub 3@Pt is stabilized by e-beam evaporation which shows 6-fold in-plane magnetic anisotropy (K@sub in@) of the order of 2x10@super 5@erg/cc.@footnote 1@ However it does not show significant perpendicular magnetic anisotropy (K@sub per@).Theoretical calculation by A. Sakuma predicts that uniaxial anisotropy is expected in a Fe@sub 3@Pt/Fe system.@footnote 2@ Therefore it is investigated the magnetic properties of Fe@sub 3@Pt/Fe system in conjunction with structure. The thickness of Fe underlayer(d) was varied from 0-300Å. The hcp phase of Fe@sub 3@Pt thin films has been synthesized onto Al@sub 2@O@sub 3@(00.1) substrate using Fe underlayer by e-beam evaporation at deposition temperature 400°C. The epitaxial relationship is found as Al@sub 2@O@sub 3@(00.1)[10.0]||Fe(110)[1-10]||Fe@sub 3@Pt(00.1)[11.0]. The superlattice peak (00.1) intensity of Fe@sub 3@Pt changes with Fe underlayer thickness and becomes maximum at the 100Å. The 6-fold symmetry of Fe@sub 3@Pt was observed in the so called @PHI@-scan measurement when the X-ray is irradiated at the grazing angle. From the perpendicular hysteresis loop of Fe@sub 3@Pt measured by MO polar kerr instrument, the coercivity and remanence is found to increase with Fe thickness and becomes constant after d=200Å. This suggests that a perpendicular magnetic anisotropy (K@sub per@) exists in the Fe@sub 3@Pt thin films by using Fe underlayer. The maximum K@sub per@ is about 3x10@super 6@erg/cc at d=100-150Å. Besides the K@sub per@, the Fe@sub 3@Pt films possess the 6-fold in-plane magnetic anisotropy (K@sub in@) which increase with increasing d and become constant after 200Å. The maximum K@sub in@ of Fe@sub 3@Pt is obtained about 3.2x10@super 5@erg/cc which is much larger than that of Co.@footnote 3@ @FootnoteText@ @footnote 1@M.A.I. Nahid and T.Suzuki: Accepted for publication in the IEEE trans. on Magn. Sep,2003. @footnote 2@A.Sakuma: J. Phy. Soc. Japan. 64,4317(1995). @footnote 3@Y. Kadena: J.Sci. Hiroshima Univ.31,21(1967). .