Polycrystalline current-perpendicular-to-plane giant magnetoresistance pseudo spin-valves using Co2Mn(Ga0.25Ge0.75) Heusler alloy

Ye Du; T. M. Nakatani; Y. K. Takahashi; N. Hase; T. Furubayashi; K. Hono

doi:10.1063/1.4817428

Polycrystalline current-perpendicular-to-plane giant magnetoresistance pseudo spin-valves using Co₂Mn(Ga_0.25Ge_0.75) Heusler alloy

Ye Du, T. M. Nakatani, Y. K. Takahashi, N. Hase, T. Furubayashi, K. Hono

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We have studied the structure and magnetoresistive properties of polycrystalline current-perpendicular-to-plane giant magnetoresistance pseudo spin-valves (PSVs) with Co₂Mn(Ga_0.25Ge_0.75) (CMGG) ferromagnetic layers and a Ag spacer. With (110) textured CMGG thin films and (111) textured Ag spacer, the PSVs annealed at 350 °C with 2 nm CoFe buffer layers showed ΔRA of 3.7 m Ω μ m 2 and MR ratio of 12.2%, while the PSVs without the buffer layer showed ΔRA of only 1.3 m Ω μ m 2. High angle angular dark field images showed that the drop of ΔRA by annealing was due to the deterioration of the multi-layer CMGG/Ag/CMGG structure. Energy-dispersive X-ray spectroscopy images further confirmed the interdiffusion between CMGG layer and the Ag layer outside the CMGG/Ag/CMGG trilayer. In addition, we discuss the difference in the magnetoresistive properties of polycrystalline and epitaxial PSVs.

Original language	English
Article number	053910
Journal	Journal of Applied Physics
Volume	114
Issue number	5
DOIs	https://doi.org/10.1063/1.4817428
Publication status	Published - 2013 Aug 7
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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@article{bccfa20d50604d089f99383b1682491c,

title = "Polycrystalline current-perpendicular-to-plane giant magnetoresistance pseudo spin-valves using Co2Mn(Ga0.25Ge0.75) Heusler alloy",

abstract = "We have studied the structure and magnetoresistive properties of polycrystalline current-perpendicular-to-plane giant magnetoresistance pseudo spin-valves (PSVs) with Co2Mn(Ga0.25Ge0.75) (CMGG) ferromagnetic layers and a Ag spacer. With (110) textured CMGG thin films and (111) textured Ag spacer, the PSVs annealed at 350 °C with 2 nm CoFe buffer layers showed ΔRA of 3.7 m Ω μ m 2 and MR ratio of 12.2%, while the PSVs without the buffer layer showed ΔRA of only 1.3 m Ω μ m 2. High angle angular dark field images showed that the drop of ΔRA by annealing was due to the deterioration of the multi-layer CMGG/Ag/CMGG structure. Energy-dispersive X-ray spectroscopy images further confirmed the interdiffusion between CMGG layer and the Ag layer outside the CMGG/Ag/CMGG trilayer. In addition, we discuss the difference in the magnetoresistive properties of polycrystalline and epitaxial PSVs.",

author = "Ye Du and Nakatani, {T. M.} and Takahashi, {Y. K.} and N. Hase and T. Furubayashi and K. Hono",

note = "Funding Information: This work was partly supported by Grant-in-Aid for Scientific Research (A) (Grant No. 22246091) and IDEMA-ASTC. Y.D. acknowledges NIMS for providing the NIMS Junior Research Assistantship.",

year = "2013",

month = aug,

day = "7",

doi = "10.1063/1.4817428",

language = "English",

volume = "114",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics Publising LLC",

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T1 - Polycrystalline current-perpendicular-to-plane giant magnetoresistance pseudo spin-valves using Co2Mn(Ga0.25Ge0.75) Heusler alloy

AU - Du, Ye

AU - Nakatani, T. M.

AU - Takahashi, Y. K.

AU - Hase, N.

AU - Furubayashi, T.

AU - Hono, K.

N1 - Funding Information: This work was partly supported by Grant-in-Aid for Scientific Research (A) (Grant No. 22246091) and IDEMA-ASTC. Y.D. acknowledges NIMS for providing the NIMS Junior Research Assistantship.

PY - 2013/8/7

Y1 - 2013/8/7

N2 - We have studied the structure and magnetoresistive properties of polycrystalline current-perpendicular-to-plane giant magnetoresistance pseudo spin-valves (PSVs) with Co2Mn(Ga0.25Ge0.75) (CMGG) ferromagnetic layers and a Ag spacer. With (110) textured CMGG thin films and (111) textured Ag spacer, the PSVs annealed at 350 °C with 2 nm CoFe buffer layers showed ΔRA of 3.7 m Ω μ m 2 and MR ratio of 12.2%, while the PSVs without the buffer layer showed ΔRA of only 1.3 m Ω μ m 2. High angle angular dark field images showed that the drop of ΔRA by annealing was due to the deterioration of the multi-layer CMGG/Ag/CMGG structure. Energy-dispersive X-ray spectroscopy images further confirmed the interdiffusion between CMGG layer and the Ag layer outside the CMGG/Ag/CMGG trilayer. In addition, we discuss the difference in the magnetoresistive properties of polycrystalline and epitaxial PSVs.

AB - We have studied the structure and magnetoresistive properties of polycrystalline current-perpendicular-to-plane giant magnetoresistance pseudo spin-valves (PSVs) with Co2Mn(Ga0.25Ge0.75) (CMGG) ferromagnetic layers and a Ag spacer. With (110) textured CMGG thin films and (111) textured Ag spacer, the PSVs annealed at 350 °C with 2 nm CoFe buffer layers showed ΔRA of 3.7 m Ω μ m 2 and MR ratio of 12.2%, while the PSVs without the buffer layer showed ΔRA of only 1.3 m Ω μ m 2. High angle angular dark field images showed that the drop of ΔRA by annealing was due to the deterioration of the multi-layer CMGG/Ag/CMGG structure. Energy-dispersive X-ray spectroscopy images further confirmed the interdiffusion between CMGG layer and the Ag layer outside the CMGG/Ag/CMGG trilayer. In addition, we discuss the difference in the magnetoresistive properties of polycrystalline and epitaxial PSVs.

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Polycrystalline current-perpendicular-to-plane giant magnetoresistance pseudo spin-valves using Co₂Mn(Ga_0.25Ge_0.75) Heusler alloy

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