CPP-GMR Technology for Future High-Density Magnetic Recording

To realize a Current-Perpendicular-to-Plane Giant Magnetoresistance (CPP-GMR) magnetic read head, we have enhanced the CPP magnetoresistance of fully metallic spin-valves by developing two groups of new magnetic materials for each magnetic layer. The first group are spin-blocking materials that cont...

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Bibliographic Details
Published in:Fujitsu scientific & technical journal 2006-01, Vol.42 (1), p.149-157
Main Authors: Nagasaka, Keiichi, Jogo, Arata, Ibusuki, Takahiro, Oshima, Hirotaka, Shimizu, Yutaka, Uzumaki, Takuya
Format: Article
Language:English
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Summary:To realize a Current-Perpendicular-to-Plane Giant Magnetoresistance (CPP-GMR) magnetic read head, we have enhanced the CPP magnetoresistance of fully metallic spin-valves by developing two groups of new magnetic materials for each magnetic layer. The first group are spin-blocking materials that control the spin-dependent transport through the synthetic ferrimagnet pinned layer using impurities. Pinned layers of these new materials do not have the low magnetoresistance disadvantage of the synthetic pinned layer in CPP spin-valves. The other group are high-resistivity magnetoresistive materials that contain a relatively high resistivity metal and have spin-dependent scatterings. These materials expand the possibility of improving the output of the CPP-GMR, which has a small resistance, and enable recording densities in excess of 300 Gbit/in2. Because a high output, high signal-to-noise ratio, and low resistance are required in read sensors for high-density recording and fast data-transfer, CPP-GMR technology will be indispensable for the future system of high-density magnetic recording.
ISSN:0016-2523