Co-based Heusler alloys for CPP-GMR spin-valves with large magnetoresistive outputs

T. M. Nakatani; N. Hase; H. S. Goripati; Y. K. Takahashi; T. Furubayashi; K. Hono

doi:10.1109/TMAG.2011.2174436

Co-based Heusler alloys for CPP-GMR spin-valves with large magnetoresistive outputs

T. M. Nakatani^*, N. Hase, H. S. Goripati, Y. K. Takahashi, T. Furubayashi, K. Hono

^*この研究の対応する著者

研究成果: Article › 査読

41 被引用数 (Scopus)

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We studied various Heusler alloy compositions for the ferromagnetic layers of current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) spin-valves (SVs) to obtain large MR outputs for the read sensor applications. The exchange biased SV with Co₂ Fe(Al_0.5 Si_0.5 ) alloy showed a resistance change-area product (Δ RA) of 6 mΩ μm ² and an MR ratio of 21% at room temperature when the Co₂ Fe(Al_0.5 Si_0.5 ) layer was well-B2-ordered by a high temperature annealing at 500°C. The critical bias current density for the spin torque effect on the reduction of ΔRA was ∼ 3 × 10 ⁷ A/cm². Based on the high spin polarization directly measured by the point contact Andreev reflection method, Co₂ (Cr _0.1 Fe_0.9 )Si, Co₂ Mn(Ga_0.5 Sn _0.5 ), and Co₂ Fe(Ge_0.5 Ga_0.5 ) alloy thin films were investigated for CPP-GMR SVs. Among them, the Co ₂Fe(Ge_0.5Ga_0.5) alloy showed a high CPP-GMR ratio in the pseudo SVs exceeding 40% at RT and 120% at 10 K.

本文言語	English
論文番号	6187793
ページ（範囲）	1751-1757
ページ数	7
ジャーナル	IEEE Transactions on Magnetics
巻	48
号	5 PART 1
DOI	https://doi.org/10.1109/TMAG.2011.2174436
出版ステータス	Published - 2012 5月
外部発表	はい

ASJC Scopus subject areas

電子材料、光学材料、および磁性材料
電子工学および電気工学

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10.1109/TMAG.2011.2174436

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title = "Co-based Heusler alloys for CPP-GMR spin-valves with large magnetoresistive outputs",

abstract = "We studied various Heusler alloy compositions for the ferromagnetic layers of current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) spin-valves (SVs) to obtain large MR outputs for the read sensor applications. The exchange biased SV with Co2 Fe(Al0.5 Si0.5 ) alloy showed a resistance change-area product (Δ RA) of 6 mΩ μm 2 and an MR ratio of 21% at room temperature when the Co2 Fe(Al0.5 Si0.5 ) layer was well-B2-ordered by a high temperature annealing at 500°C. The critical bias current density for the spin torque effect on the reduction of ΔRA was ∼ 3 × 10 7 A/cm2. Based on the high spin polarization directly measured by the point contact Andreev reflection method, Co2 (Cr 0.1 Fe0.9 )Si, Co2 Mn(Ga0.5 Sn 0.5 ), and Co2 Fe(Ge0.5 Ga0.5 ) alloy thin films were investigated for CPP-GMR SVs. Among them, the Co 2Fe(Ge0.5Ga0.5) alloy showed a high CPP-GMR ratio in the pseudo SVs exceeding 40% at RT and 120% at 10 K.",

keywords = "CPP-GMR, Heusler alloy, half-metal, read head",

author = "Nakatani, {T. M.} and N. Hase and Goripati, {H. S.} and Takahashi, {Y. K.} and T. Furubayashi and K. Hono",

note = "Funding Information: ACKNOWLEDGMENT This work was supported in part by the Grant-in-Aid for Scientific Research (B) and (A) (Grand Nos. 20360322 and 22246091), the Grant-in-Aid for Scientific Research in Priority Area “Creation and control of spin current” (Grant No. 19048029), JST-PREST, and the WPI Initiative on Materials Nanoarchitronics, MEXT, Japan. T. M. Nakatani was supported by the JSPS Research Fellowship for Young Scientists. N. Hase and H. S. Goripati acknowledge NIMS for provisions of the NIMS Junior Research Assistantship.",

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AU - Nakatani, T. M.

AU - Hase, N.

AU - Goripati, H. S.

AU - Takahashi, Y. K.

AU - Furubayashi, T.

AU - Hono, K.

N1 - Funding Information: ACKNOWLEDGMENT This work was supported in part by the Grant-in-Aid for Scientific Research (B) and (A) (Grand Nos. 20360322 and 22246091), the Grant-in-Aid for Scientific Research in Priority Area “Creation and control of spin current” (Grant No. 19048029), JST-PREST, and the WPI Initiative on Materials Nanoarchitronics, MEXT, Japan. T. M. Nakatani was supported by the JSPS Research Fellowship for Young Scientists. N. Hase and H. S. Goripati acknowledge NIMS for provisions of the NIMS Junior Research Assistantship.

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N2 - We studied various Heusler alloy compositions for the ferromagnetic layers of current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) spin-valves (SVs) to obtain large MR outputs for the read sensor applications. The exchange biased SV with Co2 Fe(Al0.5 Si0.5 ) alloy showed a resistance change-area product (Δ RA) of 6 mΩ μm 2 and an MR ratio of 21% at room temperature when the Co2 Fe(Al0.5 Si0.5 ) layer was well-B2-ordered by a high temperature annealing at 500°C. The critical bias current density for the spin torque effect on the reduction of ΔRA was ∼ 3 × 10 7 A/cm2. Based on the high spin polarization directly measured by the point contact Andreev reflection method, Co2 (Cr 0.1 Fe0.9 )Si, Co2 Mn(Ga0.5 Sn 0.5 ), and Co2 Fe(Ge0.5 Ga0.5 ) alloy thin films were investigated for CPP-GMR SVs. Among them, the Co 2Fe(Ge0.5Ga0.5) alloy showed a high CPP-GMR ratio in the pseudo SVs exceeding 40% at RT and 120% at 10 K.

AB - We studied various Heusler alloy compositions for the ferromagnetic layers of current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) spin-valves (SVs) to obtain large MR outputs for the read sensor applications. The exchange biased SV with Co2 Fe(Al0.5 Si0.5 ) alloy showed a resistance change-area product (Δ RA) of 6 mΩ μm 2 and an MR ratio of 21% at room temperature when the Co2 Fe(Al0.5 Si0.5 ) layer was well-B2-ordered by a high temperature annealing at 500°C. The critical bias current density for the spin torque effect on the reduction of ΔRA was ∼ 3 × 10 7 A/cm2. Based on the high spin polarization directly measured by the point contact Andreev reflection method, Co2 (Cr 0.1 Fe0.9 )Si, Co2 Mn(Ga0.5 Sn 0.5 ), and Co2 Fe(Ge0.5 Ga0.5 ) alloy thin films were investigated for CPP-GMR SVs. Among them, the Co 2Fe(Ge0.5Ga0.5) alloy showed a high CPP-GMR ratio in the pseudo SVs exceeding 40% at RT and 120% at 10 K.

KW - CPP-GMR

KW - Heusler alloy

KW - half-metal

KW - read head

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Co-based Heusler alloys for CPP-GMR spin-valves with large magnetoresistive outputs

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