Seed Layer for Perpendicular Magnetic Anisotropy (PMA) Thin Film

摘要

A magnetic thin film deposition having PMA (perpendicular magnetic anisotropy) is a multilayered fabrication of materials having differing crystal symmetries that smoothly transition by use of a seed layer that promotes symmetry matching. An interface between layers in the deposition, such as an interface between a layer of MgO and an Fe-containing ferromagnetic layer, is a source of perpendicular magnetic anisotropy which then propagates throughout the remainder of the deposition by means of the symmetry matching seed layer.

主权项

1. A method of forming a magnetic thin film structure having PMA (perpendicular magnetic anisotropy), comprising:
providing a thin film deposition including an interface between an MgO layer and a ferromagnetic layer formed of or containing Fe, wherein a PMA originates at said interface; forming a multilayered thin film structure over said interface, wherein said multilayered thin film structure includes material layers of different crystal symmetries; forming a transition layer between each layer having a different crystal symmetry; wherein said transition layer promotes a matching between said different crystal symmetries, thereby causing said PMA to be propagated within the entirety of said thin film deposition.