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Fast spin manipulation in magnetic heterostructures, where magneticinteractions between different materials often define the functionality ofdevices, is a key issue in the development of ultrafast spintronics. Althoughrecently developed optical approaches such as ultrafast spin-transfer andspin-orbit torques open new pathways to fast spin manipulation, these processesdo not fully utilize the unique possibilities offered by interfacial magneticcoupling effects in ferromagnetic multilayer systems. Here, we experimentallydemonstrate ultrafast photo-enhanced interfacial exchange interactions in theferromagnetic Co$_2$FeAl/(Ga,Mn)As system at low laser fluence levels. Theexcitation efficiency of Co$_2$FeAl with the (Ga,Mn)As layer is 30-40 timeshigher than the case with the GaAs layer at 5 K due to a photo-enhancedexchange coupling interaction via photoexcited charge transfer between the twoferromagnetic layers. In addition, the coherent spin precessions persist toroom temperature, excluding the drive of photo-enhanced magnetization in the(Ga,Mn)As layer and indicating a proximity-effect-related optical excitationmechanism. The results highlight the importance of considering the range ofinterfacial exchange interactions in ferromagnetic heterostructures and howthese magnetic coupling effects can be utilized for ultrafast, low-power spinmanipulation.

Ultrafast enhancement of interfacial exchange coupling in ferromagnetic bilayer