Nano-oxide-layer specular spin valve heads with synthetic pinned layer: Head performance and reliability

N. Hasegawa, F. Koike, K. Ikarashi, M. Ishizone, M. Kawamura, Y. Nakazawa, A. Takahashi, H. Tomita, H. Iwasaki, M. Sahashi

研究成果: Article査読

15 被引用数 (Scopus)


To implement the specular nano-oxide-layer (NOL) spin valve (SV) heads for use in practical applications, it is key to simultaneously achieve a good specular effect of the NOL inserted in the synthetic ferrimagnet pinned layer (i.e., high magnetoresistance MR performance) and a strong pinning field through the NOL. By using CoFe+X as a substance to be subjected to oxidation, we obtained the NOL specular SV films simultaneously achieving a high MR ratio of 17%-18% and a high pinning field of 1100-1500 Oe. Narrow track (0.12 μm) heads were fabricated and they showed a high sensitivity of 10 mV/μm. Several reliability tests were done both at the sheet film level and the actual head level. The oxygen inside NOL was found to be stable up to 350°C, and pinned layer magnetization canting after orthogonal field annealing was found to be almost the same as today's non-NOL SV films. An electrostatic discharge test and accelerated lifetime test were also performed and NOL specular heads were demonstrated to have almost the same robustness as today's non-NOL heads.

ジャーナルJournal of Applied Physics
10 I
出版ステータスPublished - 2002 5 15

ASJC Scopus subject areas

  • 物理学および天文学(全般)


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