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Perpendicular magnetic tunnel junctions with synthetic ferrimagnetic pinned layer
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We have fabricated perpendicular magnetic tunnel junctions (p-MTJs) consisting of CoPt/Ru/CoFeB/MgO/CoFeB/Pt. The tunnel magnetoresistance (TMR) of the p-MTJs characterizes the magnetic configurations of the CoPt/Ru/CoFeB pinned layer. The magnetic moment of the CoFeB, which is naturally in-plane, can be aligned to the out-of-plane direction by an indirect exchange coupling with the hcp CoPt alloy having large perpendicular magnetic anisotropy. When the applied field is relatively smaller than the exchange coupling strength, the p-MTJs show a configurationally negative TMR as a consequence of an antiparallel alignment of the CoPt and CoFeB magnetic moments.
Title: Perpendicular magnetic tunnel junctions with synthetic ferrimagnetic pinned layer
Description:
We have fabricated perpendicular magnetic tunnel junctions (p-MTJs) consisting of CoPt/Ru/CoFeB/MgO/CoFeB/Pt.
The tunnel magnetoresistance (TMR) of the p-MTJs characterizes the magnetic configurations of the CoPt/Ru/CoFeB pinned layer.
The magnetic moment of the CoFeB, which is naturally in-plane, can be aligned to the out-of-plane direction by an indirect exchange coupling with the hcp CoPt alloy having large perpendicular magnetic anisotropy.
When the applied field is relatively smaller than the exchange coupling strength, the p-MTJs show a configurationally negative TMR as a consequence of an antiparallel alignment of the CoPt and CoFeB magnetic moments.
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