Carnegie Mellon University

Jie Ziou

David N Lambeth

David Eugene Laughlin

Heng Gong

Wei Yang

The present invention provides for magnetic and magneto-optic recording media, transducers and data storage devices constructed therefrom that have highly oriented films having long range order in the crystal structure of the film. The recording medium includes a magnetic recording layer comprised of Co-based material, such as Co or one or more Co alloys having a (10{overscore (1)}0) crystal texture, a substrate, a first underlayer having a fcc structure and a (110) crystal texture disposed between the substrate and the magnetic recording layer. A second underlayer having a bcc structure and a (112) crystal texture is also disposed between the magnetic recording layer and the first underlayer. In particular, if a (110) Si single crystal substrate is non-oxidized certain metals having fcc structures, such as Ag, Cu, Al, and Au and fcc derivative structures, such L1,and L1,structures, can be epitaxially grown on the Si surface. While the one unit cell to one unit cell lattice match between fcc Ag and A4 (diamond) Si is quite poor, multiples of the Ag unit cell distance fit very well on the Si surface. The long range order of the Si surface induces the epitaxial growth of the Ag fcc structure. Upon this fcc structure, a bcc structure, such as Cr, or a bcc derivative, such as B2, DO3 and/or L2,can be epitaxially grown.

Growing community of inventors

Pittsburgh, PA, United States of America

Jie Ziou