Perpendicular coupling mediated through introduction of a spin-flop layer
Original Publication Date: 2003-Jan-22
Included in the Prior Art Database: 2003-Jun-20
90 O coupling in PtMn/Co 90 Fe 10 /CoFe 2 O 4 /Co 90 Fe 10 films S. Maat and B.A. Gurney IBM Almaden Research Center, 650 Harry Rd., San Jose, CA 95120 O We observed 90 coupling in sputtered PtMn/Co 90 Fe 10 /CoFe 2 O 4 /Co 90 Fe 10 films, in which the O first Co 90 Fe 10 is exchange biased to PtMn. The coupling changed from 90 to collinear for increasing CoFe 2 O 4 thickness or inserting a thin Al layer between the pinned layer and CoFe 2 O 4 layer. This effect could potentially be used for devices where two ferromagnetic layers need to be set perpendicular to each other in a single annealing step. A model, which can qualitatively explain the observed behavior by assuming spin flop coupling across the frustrated CoFe 2 O 4 /Co 90 Fe 10 interface is proposed.