CRYSTALLOGRAPHIC AND STRUCTURAL-ANALYSES OF PERPENDICULAR MAGNETIC CO-PT-B-O ALLOY-FILMS

CoPtBO reactive sputtered film is a new type of perpendicular recordin g media material with high perpendicular anisotropy fields and large p erpendicular coercivities. To understand the origin of the magnetic pr operties, several materials parameters were explored. These included t he effects of the introduced oxygen on the crystal structure, as well as the orientations and the microstructure of the CoPtBO films. With i ncreasing the oxygen partial pressure, the crystallographic structure of CoPtBO alloy films were changed from face-centered-cubic (111) text ure into hexagonal-close-packed (hcp) (001) texture. Pole figure analy sis is a useful method to identify the crystalline structure of the or iented films. The strong hcp (001) texture and separation of the magne tic grains are the origin of the high H(k) and large H(c) of the films .