Current-perpendicular-to-plane giant magnetoresistive properties in Co2Mn(Ge0.75Ga0.25)/Cu2TiAl/Co2Mn(Ge0.75Ga0.25) all-Heusler alloy pseudo spin valve

S. Li; Y. K. Takahashi; Y. Sakuraba; J. Chen; T. Furubayashi; O. Mryasov; S. Faleev; K. Hono

doi:10.1063/1.4942853

Current-perpendicular-to-plane giant magnetoresistive properties in Co₂Mn(Ge_0.75Ga_0.25)/Cu₂TiAl/Co₂Mn(Ge_0.75Ga_0.25) all-Heusler alloy pseudo spin valve

S. Li, Y. K. Takahashi, Y. Sakuraba, J. Chen, T. Furubayashi, O. Mryasov, S. Faleev, K. Hono^*

^*Corresponding author for this work

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

13 Citations (Scopus)

Abstract

Nonmagnetic Cu₂TiAl (CTA) Heusler compound is proposed as a new spacer material for all-Heusler alloy current-perpendicular-to-plane giant magnetoresistance devices based on first-principle calculations. The (001)-orientated Co₂Mn(Ge_0.75Ga_0.25) (CMGG)/CTA/CMGG epitaxial pseudo spin valve (PSV) grown on MgO(100) single crystal substrate showed relatively large MR output, ΔRA∼5.4 mΩ μm², which is comparable to that of the CMGG/Ag/CMGG PSV prepared with the same condition. Considering the short spin diffusion length in CTA, this result indicates a better electronic band matching for the CTA/CMGG interface than the Ag/CMGG interface in agreement with the first-principle calculation results. (001)- and (011)-orientated CMGG/CTA/CMGG PSV show similar MR outputs, indicating that the CTA spacer suppresses the orientation dependence of MR output which is usually observed in Ag-spacer CPP-PSV.

Original language	English
Article number	093911
Journal	Journal of Applied Physics
Volume	119
Issue number	9
DOIs	https://doi.org/10.1063/1.4942853
Publication status	Published - 2016 Mar 7
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Current-perpendicular-to-plane giant magnetoresistive properties in Co2Mn(Ge0.75Ga0.25)/Cu2TiAl/Co2Mn(Ge0.75Ga0.25) all-Heusler alloy pseudo spin valve",

abstract = "Nonmagnetic Cu2TiAl (CTA) Heusler compound is proposed as a new spacer material for all-Heusler alloy current-perpendicular-to-plane giant magnetoresistance devices based on first-principle calculations. The (001)-orientated Co2Mn(Ge0.75Ga0.25) (CMGG)/CTA/CMGG epitaxial pseudo spin valve (PSV) grown on MgO(100) single crystal substrate showed relatively large MR output, ΔRA∼5.4 mΩ μm2, which is comparable to that of the CMGG/Ag/CMGG PSV prepared with the same condition. Considering the short spin diffusion length in CTA, this result indicates a better electronic band matching for the CTA/CMGG interface than the Ag/CMGG interface in agreement with the first-principle calculation results. (001)- and (011)-orientated CMGG/CTA/CMGG PSV show similar MR outputs, indicating that the CTA spacer suppresses the orientation dependence of MR output which is usually observed in Ag-spacer CPP-PSV.",

author = "S. Li and Takahashi, {Y. K.} and Y. Sakuraba and J. Chen and T. Furubayashi and O. Mryasov and S. Faleev and K. Hono",

note = "Funding Information: This work was supported in part by the Grant-in-aid for Scientific Research (A) (Grant No. 25249087) from the Japan Society for the Promotion of Science (JSPS) and by the Advanced Storage Technology Consortium (ASTC) of IDEMA. J. C. acknowledges the National Institute for Materials Science (NIMS) for the provision of a Junior Research Assistantship. Publisher Copyright: {\textcopyright} 2016 AIP Publishing LLC.",

year = "2016",

month = mar,

day = "7",

doi = "10.1063/1.4942853",

language = "English",

volume = "119",

journal = "Journal of Applied Physics",

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T1 - Current-perpendicular-to-plane giant magnetoresistive properties in Co2Mn(Ge0.75Ga0.25)/Cu2TiAl/Co2Mn(Ge0.75Ga0.25) all-Heusler alloy pseudo spin valve

AU - Li, S.

AU - Takahashi, Y. K.

AU - Sakuraba, Y.

AU - Chen, J.

AU - Furubayashi, T.

AU - Mryasov, O.

AU - Faleev, S.

AU - Hono, K.

N1 - Funding Information: This work was supported in part by the Grant-in-aid for Scientific Research (A) (Grant No. 25249087) from the Japan Society for the Promotion of Science (JSPS) and by the Advanced Storage Technology Consortium (ASTC) of IDEMA. J. C. acknowledges the National Institute for Materials Science (NIMS) for the provision of a Junior Research Assistantship. Publisher Copyright: © 2016 AIP Publishing LLC.

PY - 2016/3/7

Y1 - 2016/3/7

N2 - Nonmagnetic Cu2TiAl (CTA) Heusler compound is proposed as a new spacer material for all-Heusler alloy current-perpendicular-to-plane giant magnetoresistance devices based on first-principle calculations. The (001)-orientated Co2Mn(Ge0.75Ga0.25) (CMGG)/CTA/CMGG epitaxial pseudo spin valve (PSV) grown on MgO(100) single crystal substrate showed relatively large MR output, ΔRA∼5.4 mΩ μm2, which is comparable to that of the CMGG/Ag/CMGG PSV prepared with the same condition. Considering the short spin diffusion length in CTA, this result indicates a better electronic band matching for the CTA/CMGG interface than the Ag/CMGG interface in agreement with the first-principle calculation results. (001)- and (011)-orientated CMGG/CTA/CMGG PSV show similar MR outputs, indicating that the CTA spacer suppresses the orientation dependence of MR output which is usually observed in Ag-spacer CPP-PSV.

AB - Nonmagnetic Cu2TiAl (CTA) Heusler compound is proposed as a new spacer material for all-Heusler alloy current-perpendicular-to-plane giant magnetoresistance devices based on first-principle calculations. The (001)-orientated Co2Mn(Ge0.75Ga0.25) (CMGG)/CTA/CMGG epitaxial pseudo spin valve (PSV) grown on MgO(100) single crystal substrate showed relatively large MR output, ΔRA∼5.4 mΩ μm2, which is comparable to that of the CMGG/Ag/CMGG PSV prepared with the same condition. Considering the short spin diffusion length in CTA, this result indicates a better electronic band matching for the CTA/CMGG interface than the Ag/CMGG interface in agreement with the first-principle calculation results. (001)- and (011)-orientated CMGG/CTA/CMGG PSV show similar MR outputs, indicating that the CTA spacer suppresses the orientation dependence of MR output which is usually observed in Ag-spacer CPP-PSV.

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Current-perpendicular-to-plane giant magnetoresistive properties in Co₂Mn(Ge_0.75Ga_0.25)/Cu₂TiAl/Co₂Mn(Ge_0.75Ga_0.25) all-Heusler alloy pseudo spin valve

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