We investigate the magnetic properties of amorphous SmCo/Co(AlZr)/Co(AlZr)exchange-spring magnet trilayers. The magnetically soft Co(AlZr)layer is coupled to the magnetically hard SmColayer through the weakly magnetic low-Co(AlZr)spacer layer. The strength of the coupling can be controlled with temperature and the coupling persists above the intrinsicof the spacer layer due to a long-range magnetic proximity effect. Polarized neutron reflectivity is used to examine the magnetic profile of the trilayers during magnetization reversal. A two-step switching occurs, with the switching angle of the soft layer strongly dependent on the strength of the coupling. In the strong coupling regime a magnetic state can be achieved where the soft layer magnetization is perpendicular to the hard layer whereas in the weak coupling regime the soft layer reverses fully.
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