Abstract
The magnetic interactions in the Ir20Mn80/Co/Ru/Py (Py=Ni81Fe19) spin valve structures have been studied by magnetization measurements. The Ru thickness was varied between 24 and 58 Å, and the thicknesses of the other layers were keep constant, resulting in multilayers with a strong exchange bias field (Heb) and weak oscillatory interlayer coupling. The bilinear and biquadratic coupling constants between Co and Py and the exchange anisotropy at the IrMn/Co interface were considered for modeling the magnetic hysteresis loops of the whole system. The interplay between these interactions gives rise to an increase (decrease) in the Heb value of the Co pinned layer for antiferromagnetic (ferromagnetic) interlayer coupling, if compared to the system with no interlayer coupling, and in a small exchange anisotropy field, proportional to the bilinear coupling energy, induced to the Py free layer.
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