Article Improvement in CPP-GMR read head sensor performance using [001]-oriented polycrystalline half-metallic Heusler alloy Co 2 FeGa 0.5 Ge 0.5 and CoFe bilayer electrode

Dolly Taparia ; Taisuke Sasaki SAMURAI ORCID (National Institute for Materials Science) ; Tomoya Nakatani SAMURAI ORCID (National Institute for Materials Science) ; Hirofumi Suto SAMURAI ORCID (National Institute for Materials Science) ; Yoshio Miura SAMURAI ORCID (National Institute for Materials Science) ; Zehao Li (National Institute for Materials Science) ; Varun Kumar Kushwaha (National Institute for Materials Science) ; Kazuumi Inubushi ; Shinto Ichikawa ; Katsuyuki Nakada ; Tomoyuki Sasaki (National Institute for Materials Science) ; Seiji Mitani SAMURAI ORCID (National Institute for Materials Science) ; Yuya Sakuraba SAMURAI ORCID (National Institute for Materials Science)

Improvement in CPP-GMR read head sensor performance using 001 -oriented polycrystalline half-metallic Heusler alloy Co2FeGa0.5Ge0.5 and CoFe bilayer -2.pdf
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Dolly Taparia, Taisuke Sasaki, Tomoya Nakatani, Hirofumi Suto, Yoshio Miura, Zehao Li, Varun Kumar Kushwaha, Kazuumi Inubushi, Shinto Ichikawa, Katsuyuki Nakada, Tomoyuki Sasaki, Seiji Mitani, Yuya Sakuraba. Improvement in CPP-GMR read head sensor performance using [001]-oriented polycrystalline half-metallic Heusler alloy Co 2 FeGa 0.5 Ge 0.5 and CoFe bilayer electrode. Science and Technology of Advanced Materials. 2024, 25 (1), 2388503. https://doi.org/10.1080/14686996.2024.2388503
SAMURAI

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(abstract)

A current-perpendicular-to-plane giant magnetoresistive (CPP-GMR) device with a half-metallic electrode is one of the most promising candidates of next-generation read head for hard disk drive. In this study, we fabricate [001]-oriented polycrystalline CPP-GMR devices with the normal ferromagnet (NFM) CoFe/half-metallic ferromagnet (HMFM) Co2FeGa0.5Ge0.5 (CFGG) bilayer electrodes to enhance the magnetoresistance (MR) ratio by large interfacial spin dependent scattering at the NFM/HMFM interface. The CoFe/CFGG bilayer electrode provides the additional large interfacial spin-dependent scattering and achieves high MR ratio of 22.7% with the CoFe(4.5 nm)/CFGG(2.5 nm) bilayer electrodes, which is almost three(two) times larger
than the MR ratio with the single CoFe(CFGG) (7 nm) electrodes. The bias voltage dependent
study revealed an additional advantage of increasing the output voltage |ΔV| by using the CoFe/CFGG bilayer due to the improvement of the endurance against spin-transfer torque under high bias current. A maximum output voltage jΔVjmax of 6.5 mV was obtained with the CoFe(5.5 nm)/CFGG(1.5 nm) electrodes, which is the highest ever reported in the CPP-GMR devices with a uniform metallic spacer including high-quality epitaxial devices.

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Keyword: read head , HDD, CPP-GMR, half-metal, Heusler alloy

Date published: 2024-12-31

Publisher: Informa UK Limited

Journal:

  • Science and Technology of Advanced Materials (ISSN: 14686996) vol. 25 issue. 1 2388503

Funding:

  • MEXT Initiative to Establish Next-generation Novel Integrated Circuits Centers JPMJCR21O1

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1080/14686996.2024.2388503

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Updated at: 2025-01-07 16:30:56 +0900

Published on MDR: 2025-01-07 16:30:57 +0900

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