Abstract
A strong perpendicular magnetic anisotropy is obtained in MgO/FePtB/Ti films. After high-temperature (600 °C) annealing, an amorphous FePtB layer on a thin polycrystalline MgO layer is transformed into an L10 ordered phase with a long range ordering parameter of 0.9 and an effective magnetic anisotropy of 1.29×107 erg/cm3. The depth profile of the atomic concentration reveals that the Ti capping layer absorbs boron from the FePtB layer during the annealing. The high-resolution electron microscopy analysis shows that the crystallized FePtB layer has an epitaxial relationship with the underlying MgO layer.
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