TY - JOUR
T1 - Electrochemical formation of intermediate layer for Co/Pd multilayered media
AU - Kawaji, Jun
AU - Kimura, Koji
AU - Asahi, Toru
AU - Homma, Takayuki
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 Establishment of Consolidated Research Institute for Advanced Science and Medical Care, and of the Center of Excellence Research on Molecular Nano-Engineering from MEXT, and that of the Storage Research Consortium (SRC), Japan. The CoNiFeB SULs were provided by Dr. T. Tsumori, Shin-Etsu Chemical Co., Ltd., Japan.
PY - 2006/8
Y1 - 2006/8
N2 - Pd nanocluster seeds were formed on a soft magnetic underlayer (SUL) using an electrochemical substitution reaction, and were utilized as an intermediate layer for a Co/Pd multilayered ([Co/Pd]n) perpendicular magnetic recording medium. A CoNiFeB film prepared with electroless deposition was used as SUL, which was immersed into a PdCl2 solution for the formation of Pd seeds. The Pd seeds were found to effectively reduce the size of magnetic domains in the [Co/Pd]n film deposited on them. The optimization of the concentration of the PdCl2 solution and the use of the pretreatment process with a SnCl2 solution were effective to obtain the smooth SUL surface with fine Pd seeds as small as 5 nm. The 20 nm-thick [Co/Pd]n film deposited on the optimized Pd seeds/CoNiFeB SUL exhibited a high coercivity of 7.8 kOe and a small magnetic domain size of 69 nm. These results indicated that the combination of the Pd seeds and the electroless-deposited SUL was desirable in terms of the improvement not only in the magnetic properties of [Co/Pd]n media but also in the mass productivity of the underlayer.
AB - Pd nanocluster seeds were formed on a soft magnetic underlayer (SUL) using an electrochemical substitution reaction, and were utilized as an intermediate layer for a Co/Pd multilayered ([Co/Pd]n) perpendicular magnetic recording medium. A CoNiFeB film prepared with electroless deposition was used as SUL, which was immersed into a PdCl2 solution for the formation of Pd seeds. The Pd seeds were found to effectively reduce the size of magnetic domains in the [Co/Pd]n film deposited on them. The optimization of the concentration of the PdCl2 solution and the use of the pretreatment process with a SnCl2 solution were effective to obtain the smooth SUL surface with fine Pd seeds as small as 5 nm. The 20 nm-thick [Co/Pd]n film deposited on the optimized Pd seeds/CoNiFeB SUL exhibited a high coercivity of 7.8 kOe and a small magnetic domain size of 69 nm. These results indicated that the combination of the Pd seeds and the electroless-deposited SUL was desirable in terms of the improvement not only in the magnetic properties of [Co/Pd]n media but also in the mass productivity of the underlayer.
KW - Co/Pd multilayered film
KW - Electrochemical process
KW - Intermediate layer
KW - Pd seeds
KW - Perpendicular magnetic recording media
KW - Soft magnetic underlayer
UR - http://www.scopus.com/inward/record.url?scp=33646237582&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33646237582&partnerID=8YFLogxK
U2 - 10.1016/j.jmmm.2006.01.091
DO - 10.1016/j.jmmm.2006.01.091
M3 - Article
AN - SCOPUS:33646237582
SN - 0304-8853
VL - 303
SP - e128-e132
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
IS - 2 SPEC. ISS.
ER -