TY - JOUR
T1 - Magnetic microstructure and noise property of electrolessly deposited CoNiFeB soft magnetic underlayer
AU - Sugiyama, Atsushi
AU - Adachi, Ken
AU - Sakagami, Manko
AU - Yoshino, Masahiro
AU - Kawaji, Jun
AU - Asahi, Toru
AU - Tsumori, Toshihiro
AU - Osaka, Tetsuya
N1 - Funding Information:
This work was carried out at the “Center for Practical Nano-Chemistry” in the 21C-COE Program, MEXT, and was finan- cially supported by grants-in-aid of “Establishment of Consolidated Research Institute for Advanced Science and Medical Care,” the Special Coordination Funds for Promoting Science and Technology “Creation of Novel Magnetic Recording Materials Using Nano-Interface Technology,” and the Center of Excellence Research “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. The authors express their gratitude to Dr. Ohmori, Showa Denko K.K., for providing NiP/Al substrate.
PY - 2005/10
Y1 - 2005/10
N2 - A CoNiFeB soft magnetic underlayer (SUL) was prepared by electroless deposition using dimethylamineborane as the reducing agent. A 2.5-inch NiP/Al disk was used as the substrate, on which a NiP nonmagnetic amorphous-layer was also electrolessly deposited. The coercivity Hc of as-deposited CoNiFeB films in the direction parallel to the surface exhibited a convex-parabolic dependency on the film thickness. The in-plane M-H loops and the two-dimensional Kerr effect images of the CoNiFeB film showed a nearly isotropic character with Hc of 25 Oe and no marked domain boundaries. From magnetic force microscope measurements, we confirmed that these behaviors resulted from the formation of striped magnetic domains caused by slightly perpendicular magnetic anisotropy of SUL. As far as the noise characteristics are concerned, dc noise was increased with Hc, while spike noise was suppressed.
AB - A CoNiFeB soft magnetic underlayer (SUL) was prepared by electroless deposition using dimethylamineborane as the reducing agent. A 2.5-inch NiP/Al disk was used as the substrate, on which a NiP nonmagnetic amorphous-layer was also electrolessly deposited. The coercivity Hc of as-deposited CoNiFeB films in the direction parallel to the surface exhibited a convex-parabolic dependency on the film thickness. The in-plane M-H loops and the two-dimensional Kerr effect images of the CoNiFeB film showed a nearly isotropic character with Hc of 25 Oe and no marked domain boundaries. From magnetic force microscope measurements, we confirmed that these behaviors resulted from the formation of striped magnetic domains caused by slightly perpendicular magnetic anisotropy of SUL. As far as the noise characteristics are concerned, dc noise was increased with Hc, while spike noise was suppressed.
KW - CoNiFe
KW - De noise
KW - Electroless deposition
KW - Soft magnetic imderlayer
KW - Spike noise
KW - Striped magnetic domain
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U2 - 10.1109/TMAG.2005.855273
DO - 10.1109/TMAG.2005.855273
M3 - Article
AN - SCOPUS:27744523573
SN - 0018-9464
VL - 41
SP - 3163
EP - 3165
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 10
ER -