Low-field switching of noncollinear spin texture at La0.7Sr0.3MnO3-SrRuO3 interfaces
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Interfaces of ferroic oxides can show complex magnetic textures which have strong impact on spintronics
devices. This has been demonstrated recently for interfaces with insulating antiferromagnets such as BiFeO3.
Here, noncollinear spin textures which can be switched in very low magnetic field are reported for conducting
ferromagnetic bilayers of La0.7Sr0.3MnO3-SrRuO3 (LSMO-SRO). The magnetic order and switching are
fundamentally different for bilayers coherently grown in reversed stacking sequence. The SRO top layer forms
a persistent exchange spring which is antiferromagnetically coupled to LSMO and drives switching in low fields
of a few milliteslas. Density functional theory reveals the crucial impact of the interface termination on the
strength of Mn-Ru exchange coupling across the interface. The observation of an exchange spring agrees with
ultrastrong coupling for theMnO2/SrO termination. Our results demonstrate low-field switching of noncollinear
spin textures at an interface between conducting oxides, opening a pathway for manipulating and utilizing electron transport phenomena in controlled spin textures at oxide interfaces.