We have investigated the feasibility of using FePdB alloy layers for perpendicular magnetic tunnel junctions (p-MTJs). The perpendicular magnetic anisotropy (PMA) of FePdB films is obtained by depositing amorphous Fe40Pd40B20 layers on proper templates and by postannealing. An FePdB film on a thick Pt (001) underlayer has a PMA energy (Ku) of 4.9×106 erg/cm3, and an FePdB layer sandwiched by two thin MgO (001) layers shows a Ku of 3.7×106 erg/cm3. A double barrier p-MTJ with an FePdB middle layer shows a tunnel magnetoresistance of 6.8%.
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Choi et al. (2010) studied this question.
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