Current-perpendicular-to-plane giant magnetoresistance using Co 2Fe(Ga1-xGex) Heusler alloy

H. S. Goripati; T. Furubayashi; Y. K. Takahashi; K. Hono

doi:10.1063/1.4788672

Current-perpendicular-to-plane giant magnetoresistance using Co ₂Fe(Ga_1-xGe_x) Heusler alloy

H. S. Goripati^*, T. Furubayashi, Y. K. Takahashi, K. Hono

^*Corresponding author for this work

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

41 Citations (Scopus)

Abstract

We investigated the current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) of pseudo spin valves (PSVs) using ferromagnetic (FM) Heusler alloy Co₂Fe(Ga_1-xGe_x) (x = 0, 0.5, and 1) layers and an Ag spacer layer. The FM layer with x = 0.5 gave rise to the highest MR output, ΔRA = 8.7 mΩ·μm², at room temperature with 10 nm thick Heusler alloy layers. The MR output increased with increasing annealing temperature, T_a, with a maximum at T_a = 500 °C. Transmission electron microscopy showed no visible changes in the layered structure; however, energy dispersive x-ray analysis indicated a considerable diffusion of Ga and Ge into the other layers by annealing at T _a = 550 °C. The ΔRA dependence on the thickness of the FM layers indicated that both high bulk and interface spin asymmetries contribute to the high MR output.

Original language	English
Article number	043901
Journal	Journal of Applied Physics
Volume	113
Issue number	4
DOIs	https://doi.org/10.1063/1.4788672
Publication status	Published - 2013 Jan 28
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Current-perpendicular-to-plane giant magnetoresistance using Co 2Fe(Ga1-xGex) Heusler alloy",

abstract = "We investigated the current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) of pseudo spin valves (PSVs) using ferromagnetic (FM) Heusler alloy Co2Fe(Ga1-xGex) (x = 0, 0.5, and 1) layers and an Ag spacer layer. The FM layer with x = 0.5 gave rise to the highest MR output, ΔRA = 8.7 mΩ·μm2, at room temperature with 10 nm thick Heusler alloy layers. The MR output increased with increasing annealing temperature, Ta, with a maximum at Ta = 500 °C. Transmission electron microscopy showed no visible changes in the layered structure; however, energy dispersive x-ray analysis indicated a considerable diffusion of Ga and Ge into the other layers by annealing at T a = 550 °C. The ΔRA dependence on the thickness of the FM layers indicated that both high bulk and interface spin asymmetries contribute to the high MR output.",

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

note = "Funding Information: HSG thanks NIMS for the provision of a NIMS Junior Research Assistantship. This work was in part supported by Grant-in-Aids for Scientific Research (A), Grant No. 22246091, and by Strategic International Research Cooperative Program, Japan Science and Technology Agency (JST).",

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doi = "10.1063/1.4788672",

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AU - Furubayashi, T.

AU - Takahashi, Y. K.

AU - Hono, K.

N1 - Funding Information: HSG thanks NIMS for the provision of a NIMS Junior Research Assistantship. This work was in part supported by Grant-in-Aids for Scientific Research (A), Grant No. 22246091, and by Strategic International Research Cooperative Program, Japan Science and Technology Agency (JST).

PY - 2013/1/28

Y1 - 2013/1/28

N2 - We investigated the current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) of pseudo spin valves (PSVs) using ferromagnetic (FM) Heusler alloy Co2Fe(Ga1-xGex) (x = 0, 0.5, and 1) layers and an Ag spacer layer. The FM layer with x = 0.5 gave rise to the highest MR output, ΔRA = 8.7 mΩ·μm2, at room temperature with 10 nm thick Heusler alloy layers. The MR output increased with increasing annealing temperature, Ta, with a maximum at Ta = 500 °C. Transmission electron microscopy showed no visible changes in the layered structure; however, energy dispersive x-ray analysis indicated a considerable diffusion of Ga and Ge into the other layers by annealing at T a = 550 °C. The ΔRA dependence on the thickness of the FM layers indicated that both high bulk and interface spin asymmetries contribute to the high MR output.

AB - We investigated the current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) of pseudo spin valves (PSVs) using ferromagnetic (FM) Heusler alloy Co2Fe(Ga1-xGex) (x = 0, 0.5, and 1) layers and an Ag spacer layer. The FM layer with x = 0.5 gave rise to the highest MR output, ΔRA = 8.7 mΩ·μm2, at room temperature with 10 nm thick Heusler alloy layers. The MR output increased with increasing annealing temperature, Ta, with a maximum at Ta = 500 °C. Transmission electron microscopy showed no visible changes in the layered structure; however, energy dispersive x-ray analysis indicated a considerable diffusion of Ga and Ge into the other layers by annealing at T a = 550 °C. The ΔRA dependence on the thickness of the FM layers indicated that both high bulk and interface spin asymmetries contribute to the high MR output.

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Current-perpendicular-to-plane giant magnetoresistance using Co ₂Fe(Ga_1-xGe_x) Heusler alloy

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