  Organic semiconductors (OSCs) are suitable materials for spintronics
applications as they form a spinterface when placed next to a ferromagnet,
which in turn leads to novel functionalities. The evolution of spinterface can
tune the global magnetic anisotropy, magnetization reversal, magnetization
dynamics, etc. Planar tris-(8-hydroxyquinoline)aluminum (Alq3) OSC has shown
tremendous potential for spintronics applications, thanks to its efficient
spin-polarized current transport ability. Here, we establish the spinterface
when the Alq3 molecules are deposited on amorphous ferromagnet
Co20Fe60B20(CFB). The $\pi$-d hybridization in CFB/Alq3 enhances the coercive
field and significantly modifies the shape and size of the magnetic domains. A
$\sim$100% increase in uniaxial anisotropic energies and a reduction in
magnetic damping are also evident owing to the strong interfacial
hybridization.
