Relationship between the structure and the characteristic distribution along the film thickness in Co/Pd multilayers

• Published in: ITE Technical Report pp. 13 - 18
• Main Authors: YOSHIKAWA, Hironori, KONG, Sok-hyun, NAKAGAWA, Shigeki
• Format: Journal Article
• Language: Japanese
• Published: The Institute of Image Information and Television Engineers 13.12.2002
• Subjects: Co-Pd; grain size; multilayers; nucleation field; prependicular magnetic recording media; surface roughness
• ISSN: 1342-6893; 2424-1970
• DOI: 10.11485/itetr.26.80.0_13

The effects of the roughness R_a and the erain size D at the surface and the interface of Co/Pd multilayers on the magnetic properties were investigated. Increase of the number of Co/Pd bilayers caused slight increase of surface roughness D, resulting in slight increase of perpendicular coercivity H_c and nucleation field |H_n|. Addition of Pd under layer caused the enlargement of surface roughness of the multilayers and the decrease of α(=4π(dM/dH)_<H=Hc>) and increase of H_c. It was effective for understanding origins of magnetic properties to prepare Co and Pd layers at different Ar gas pressure P_. It is necessary to prepare Pd layer with high Ar gas pressure to attain higher |H_n|. Enlargement of surface roughness R_a is essentially required to decrease α.