Abstract
We investigate interlayer magnetostatic coupling and linear magnetoresistance in [Pd/Co]/MgO/Co and [Pd/Co]/MgO/Co/MgO/[Co/Pd] tunnel junctions, where Co/Pd and Co ferromagnetic layers exhibit out-of-plane and in-plane magnetic anisotropy, respectively. Because of the magnetostatic interaction between Co moments and the stray field from Co/Pd stripe domains, the Co layer shows a significant enhancement of coercivity and exchange bias. Linear magnetoresistance is observed in both junctions in the field up to 15 kOe with the current perpendicular to the film plane, due to coherent rotation of the ferromagnets, making junctions with MgO barrier and orthogonal magnetization configuration a promising high magnetic field sensor.
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