Analysis of Co∕Pt and Co∕Pd multilayer films was performed to investigate the dependence of interfacial magnetic anisotropy (IMA) and induced magnetization on the thickness of the laminated Pd or Pt layers. For the Co∕Pd films, the IMA energy increased as the thickness of the laminated Pd layer was increased up to ∼0.8nm and depended proportionally on the amount of the induced magnetization. This suggests that the whole magnetic moment induced in a few Pd atomic layers contributed to the IMA. In contrast, for the Co∕Pt films, this proportional relationship only held when the thickness of the Pt layer was less than ∼0.2nm. Since one Pt monolayer is 0.225nm thick, the amount of the IMA energy in the Co∕Pt films is proportional to the number of Pt–Co atomic contacts. This difference between Co∕Pt and Co∕Pd multilayer films is attributed to the difference in the latent ferromagnetism between Pt and Pd.

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Effects of intermediate layers on magnetic properties and read/write performance inCoCrPt perpendicular recording media with an FeHfN soft magnetic underlayer J. Appl. Phys. 93, 7747 (2003); 10.1063/1.1540154Effect of seed layers in improving the crystallographic texture of CoCrPt perpendicular recording mediaThe stacking fault density and its spatial distribution in Co-Cr-Pt films used for perpendicular magnetic recording media have been studied with high-resolution transmission electron microscopy. The stacking fault density increased as the temperature for film fabrication increased. In addition, the number of stacking faults was large in the initial region of film growth, regardless of the fabrication temperature, due to interfacial stress with the underlayer. By comparing the structural properties in terms of stacking faults and grain size with the magnetic properties, we found that stacking faults strongly affect the anisotropy constant and the coercivity of perpendicular media.

Absiract -The thermal decay of written bits in CoCrPt/CrTi thin film media for high density longitudinal magnetic recording is examined using a magnetoresistive head at room temperature. A decay in signal output over time is observed for the media with a thin magnetic layer less than about 14 nm thick and the media noise increases. The thermal stability factor Ku.V/k.T of these media is estimated to be less than about 100. The signal decay and noise increase are more serious at higher linear recording densities. These results are consistent with the results of a micromagnetic simulation taking into account the thermal aftereffects. These characteristics suggest that media with a large magnetic anisotropy constant Ku will be required to realize high storage densities of over 10 Gbhn'.