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Observation of parallel-antiparallel magnetic coupling in ultrathin CoFeB-MgO based structures with perpendicular magnetic anisotropy

by: Chih W. Cheng, C. H. Shiue, Tsung I. Cheng, G. Chern
Journal of Applied Physics, Vol. 112, No. 3. (2012), 033917, doi:10.1063/1.4745905  Key: citeulike:11186579

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Abstract

A series of MgO/CoFeB/Ta(x)/CoFeB/MgO multilayered structures is fabricated by sputtering. Magnetic parallel-antiparallel oscillatory behavior is observed as a function of Ta thickness, while perpendicular magnetic anisotropy (PMA) also exists due to the MgO stabilization. The oscillatory period is ∼1.3 nm with a maximum interlayer exchange coupling (IEC) of ∼0.02 erg/cm2. The Ta spacer can be replaced by a layer of other metals to form a general perpendicular synthetic antiferromagnetic structure. The tuning of IEC and PMA by insertion of Ru is discussed.


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