High coercivity $L10$ FePt films with perpendicular anisotropy deposited on glass substrate at reduced temperature

The microstructures and magnetic properties of FePt films grown at $350°C$ on glass substrates with MgO (200) intermediate layer and CrRu (200) underlayer were investigated. The film with $1nm$ MgO intermediate layer showed higher degree of chemical ordering than that with $4nm$ MgO layer due to the compression of the lattice constant of $1nm$ MgO intermediate layer along the [100] direction. Isolated FePt particles were formed when nominal thickness of FePt was $4nm$⁠. The room temperature coercivity of isolated FePt particles with $1nm$ MgO intermediate layer was as high as $12kOe$⁠, significantly larger than that with $4nm$ MgO intermediate layer $(6.3kOe)$⁠.