TY - JOUR
T1 - Microstructure of a Co/Pd multilayered perpendicular recording medium with Pd seeds prepared by electrochemical process
AU - Tanaka, Mutsumi
AU - Kawaji, Jun
AU - Kimura, Koji
AU - Asahi, Toru
AU - Homma, Takayuki
AU - Matsunuma, Satoshi
AU - Osaka, Tetsuya
N1 - Funding Information:
This work was carried out at the “Center for Practical Nano-Chemistry” in the 21C-COE Programme, the Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT). The work was financially supported by grants-in-aid of the Special Coordination Funds for Promoting Science and Technology, “Creation of Novel Magnetic Recording Materials Using Nano-Interface Technology”, and that of the Center of Excellence Research on “Establishment of Molecular Nano-Engineering by Utilizing Nanostructure Arrays and Its Development into Micro-Systems” from MEXT, and that of the Storage Research Consortium (SRC), Japan. J.K. acknowledges the Research Fellowship of the Japan Society for the Promotion of Science for Young Scientists.
PY - 2005/2
Y1 - 2005/2
N2 - Effects of the Pd seeds formed by an electrochemical process on the microstructures of Co/Pd multilayered perpendicular recording media were investigated. By immersing a CoZrNb soft magnetic underlayer (SUL) into PdCl2 aqueous solution, island-like Pd clusters were deposited on the SUL, resulting from the electrochemical substitution reaction. Transmission electron microscopic observations revealed that the columnar Co/Pd multilayered grains with clear boundaries grew on the SUL with the Pd clusters. The clear grain boundaries, where the densities of Co and Pd elements were low, were thought to cause the magnetic exchange decoupling between the Co/Pd grains, leading to an increase of perpendicular coercivity and a decrease of magnetic cluster size of Co/Pd multilayered film. Consequently, lower medium noise was obtained for the Co/Pd multilayered medium with the Pd clusters than for that with a sputter-deposited Pd seedlayer. From these investigations, it was clarified that the SUL surface with Pd clusters provided the effective nucleation sites for a well-defined Co/Pd multilayered grain growth.
AB - Effects of the Pd seeds formed by an electrochemical process on the microstructures of Co/Pd multilayered perpendicular recording media were investigated. By immersing a CoZrNb soft magnetic underlayer (SUL) into PdCl2 aqueous solution, island-like Pd clusters were deposited on the SUL, resulting from the electrochemical substitution reaction. Transmission electron microscopic observations revealed that the columnar Co/Pd multilayered grains with clear boundaries grew on the SUL with the Pd clusters. The clear grain boundaries, where the densities of Co and Pd elements were low, were thought to cause the magnetic exchange decoupling between the Co/Pd grains, leading to an increase of perpendicular coercivity and a decrease of magnetic cluster size of Co/Pd multilayered film. Consequently, lower medium noise was obtained for the Co/Pd multilayered medium with the Pd clusters than for that with a sputter-deposited Pd seedlayer. From these investigations, it was clarified that the SUL surface with Pd clusters provided the effective nucleation sites for a well-defined Co/Pd multilayered grain growth.
KW - Co/Pd multilayered perpendicular recording media
KW - Electrochemical process
KW - Microstructure
KW - Pd seeds
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U2 - 10.1016/j.jmmm.2004.10.031
DO - 10.1016/j.jmmm.2004.10.031
M3 - Article
AN - SCOPUS:12344338297
SN - 0304-8853
VL - 287
SP - 188
EP - 192
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
IS - SPEC. ISS.
ER -