Magnetic properties and nanostructures of FePtCu : C thin films with FePt underlayers

摘要

Magnetic properties and nanostructures of FePtCu:C thin films with FePt underlayers (ULs) are studied. The effect of FePt ULs on the orientation and magnetic properties of the thin films are investigated by adjusting FePt UL thicknesses from 2 nm to 14 nm. X-ray diffraction (XRD) scans reveal that the orientation of the Elms is dependent on FePt UL thickness. For a 5-nm FePtCu:C nanocomposite thin Elm with a 2-nm FePt UL, the coercivity is 6.5KOe, the correlation length is 59nm, the desired lace-centred-tetragonal (fct) ordered structure [L1(0) phase] is formed and the c axis normal to the Elm plane [(001) texture] is obtained. These results indicate that the better orientation and magnetic properties of the films can be tuned by decreasing the thickness of the FePt UL.