MR ratio enhancement by NOL current-confined-path structures in CPP spin valves

Hideaki Fukuzawa, Hiromi Yuasa, Susumu Hashimoto, Katsuhiko Koi, Hitoshi Iwasaki, Masayuki Takagishi, Yoichiro Tanaka, Masashi Sahashi

Research output: Contribution to journalArticle

90 Citations (Scopus)

Abstract

We have compared the magnetoresistance (MR) performance of current-confined-path (CCP) current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) spin valve films with a nano-oxide-layer (NOL), made between natural oxidation (NO) and ion-assisted oxidation (IAO). For the NO, an MR ratio was only 1.5% at an RA of 370 mωμm2, whereas for the IAO, an MR ratio was greatly increased to 5.4% at an RA of 500 mωμm2. Fitted data by the Valet-Fert model showing larger MR enhancement effect by the IAO is explained by the improvement of the metal-purity of the Cu inside the CCP structure. By further improvement of metal-purity of the Cu, a large MR ratio of more than 30% can be expected at a small RA of 300 mωμm2. The CCP-CPP spin valve film is a promising candidate for realizing high-density recording heads for 200 to 400-Gbpsi recording.

Original languageEnglish
Pages (from-to)2236-2238
Number of pages3
JournalIEEE Transactions on Magnetics
Volume40
Issue number4 II
DOIs
Publication statusPublished - Jul 1 2004

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Magnetoresistance
Oxides
Oxidation
Ions
Metals
Giant magnetoresistance
3-(2-carboxypiperazin-4-yl)propyl-1-phosphonic acid

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Fukuzawa, H., Yuasa, H., Hashimoto, S., Koi, K., Iwasaki, H., Takagishi, M., ... Sahashi, M. (2004). MR ratio enhancement by NOL current-confined-path structures in CPP spin valves. IEEE Transactions on Magnetics, 40(4 II), 2236-2238. https://doi.org/10.1109/TMAG.2004.829185

MR ratio enhancement by NOL current-confined-path structures in CPP spin valves. / Fukuzawa, Hideaki; Yuasa, Hiromi; Hashimoto, Susumu; Koi, Katsuhiko; Iwasaki, Hitoshi; Takagishi, Masayuki; Tanaka, Yoichiro; Sahashi, Masashi.

In: IEEE Transactions on Magnetics, Vol. 40, No. 4 II, 01.07.2004, p. 2236-2238.

Research output: Contribution to journalArticle

Fukuzawa, H, Yuasa, H, Hashimoto, S, Koi, K, Iwasaki, H, Takagishi, M, Tanaka, Y & Sahashi, M 2004, 'MR ratio enhancement by NOL current-confined-path structures in CPP spin valves', IEEE Transactions on Magnetics, vol. 40, no. 4 II, pp. 2236-2238. https://doi.org/10.1109/TMAG.2004.829185
Fukuzawa, Hideaki ; Yuasa, Hiromi ; Hashimoto, Susumu ; Koi, Katsuhiko ; Iwasaki, Hitoshi ; Takagishi, Masayuki ; Tanaka, Yoichiro ; Sahashi, Masashi. / MR ratio enhancement by NOL current-confined-path structures in CPP spin valves. In: IEEE Transactions on Magnetics. 2004 ; Vol. 40, No. 4 II. pp. 2236-2238.
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