Journal
APPLIED PHYSICS LETTERS
Volume 103, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4816968
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Funding
- ANR (French National Research Agency) under project ANR-NANO PATHOS
- European Union under the ERC HYMAGINE project [246942]
- European Research Council (ERC) [246942] Funding Source: European Research Council (ERC)
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Ultrathin Ta layers were inserted in the bottom hard (Co/Pt)/Ta/CoFeB/MgO magnetic electrode of perpendicular magnetic tunnel junctions. The magnetization of the top part of this electrode abruptly falls in-plane when the Ta thickness exceeds 0.45 nm. This results from the balance between the various energy terms acting on this layer (exchange-like coupling through Ta, demagnetizing energy, and perpendicular anisotropy at the CoFeB/MgO interface). For small Ta thicknesses, this insertion leads to a strong improvement of the tunnel magnetoresistance, as long as the magnetization of all layers remains perpendicular-to-plane. (C) 2013 AIP Publishing LLC.
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