Temperature dependence of magnetoresistive output of pseudo spin valves with Co2Fe(Al1-xSix) Heusler alloys and a Ag spacer

T. Furubayashi; T. M. Nakatani; H. S. Goripati; H. Sukegawa; Y. K. Takahashi; K. Inomata; K. Hono

doi:10.1063/1.4821243

Temperature dependence of magnetoresistive output of pseudo spin valves with Co₂Fe(Al_1-xSi_x) Heusler alloys and a Ag spacer

T. Furubayashi, T. M. Nakatani, H. S. Goripati, H. Sukegawa, Y. K. Takahashi, K. Inomata, K. Hono

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

10 Citations (Scopus)

Abstract

We investigated the temperature dependence of magnetoresistive (MR) outputs of current-perpendicular-to-plane pseudo spin valves with Co ₂FeAl_1-xSi_x (0 ≤ x ≤ 1) Heusler alloy ferromagnetic layers and a Ag spacer layer to optimize x. The MR ratios at room temperature do not show x dependence, while the MR ratios measured at 5 K showed strong x dependence; the largest resistance change-area product ΔRA = 21 mΩ·μm² was obtained for x = 1 and ΔRA decreased with decreasing x. The results apparently contradicts with the theoretical prediction that the highest spin polarization is attained for x = 0.5. The discrepancy is due to the structural origin that the L2 ₁ order is obtained only in the Co₂FeSi alloy film.

Original language	English
Article number	123910
Journal	Journal of Applied Physics
Volume	114
Issue number	12
DOIs	https://doi.org/10.1063/1.4821243
Publication status	Published - 2013 Sept 28
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1063/1.4821243

Cite this

@article{5e43ec80445242e3b0854538cc69da86,

title = "Temperature dependence of magnetoresistive output of pseudo spin valves with Co2Fe(Al1-xSix) Heusler alloys and a Ag spacer",

abstract = "We investigated the temperature dependence of magnetoresistive (MR) outputs of current-perpendicular-to-plane pseudo spin valves with Co 2FeAl1-xSix (0 ≤ x ≤ 1) Heusler alloy ferromagnetic layers and a Ag spacer layer to optimize x. The MR ratios at room temperature do not show x dependence, while the MR ratios measured at 5 K showed strong x dependence; the largest resistance change-area product ΔRA = 21 mΩ·μm2 was obtained for x = 1 and ΔRA decreased with decreasing x. The results apparently contradicts with the theoretical prediction that the highest spin polarization is attained for x = 0.5. The discrepancy is due to the structural origin that the L2 1 order is obtained only in the Co2FeSi alloy film.",

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

note = "Funding Information: H.S.G. thanks the National Institute for Materials Science for providing a NIMS junior research assistantship. This work was partly supported by Grant-in-Aid for Scientific Research (A) 22246091 and (B) 20360322, and by IDEMA-ASTC. ",

year = "2013",

month = sep,

day = "28",

doi = "10.1063/1.4821243",

language = "English",

volume = "114",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics Publising LLC",

number = "12",

}

TY - JOUR

T1 - Temperature dependence of magnetoresistive output of pseudo spin valves with Co2Fe(Al1-xSix) Heusler alloys and a Ag spacer

AU - Furubayashi, T.

AU - Nakatani, T. M.

AU - Goripati, H. S.

AU - Sukegawa, H.

AU - Takahashi, Y. K.

AU - Inomata, K.

AU - Hono, K.

N1 - Funding Information: H.S.G. thanks the National Institute for Materials Science for providing a NIMS junior research assistantship. This work was partly supported by Grant-in-Aid for Scientific Research (A) 22246091 and (B) 20360322, and by IDEMA-ASTC.

PY - 2013/9/28

Y1 - 2013/9/28

N2 - We investigated the temperature dependence of magnetoresistive (MR) outputs of current-perpendicular-to-plane pseudo spin valves with Co 2FeAl1-xSix (0 ≤ x ≤ 1) Heusler alloy ferromagnetic layers and a Ag spacer layer to optimize x. The MR ratios at room temperature do not show x dependence, while the MR ratios measured at 5 K showed strong x dependence; the largest resistance change-area product ΔRA = 21 mΩ·μm2 was obtained for x = 1 and ΔRA decreased with decreasing x. The results apparently contradicts with the theoretical prediction that the highest spin polarization is attained for x = 0.5. The discrepancy is due to the structural origin that the L2 1 order is obtained only in the Co2FeSi alloy film.

AB - We investigated the temperature dependence of magnetoresistive (MR) outputs of current-perpendicular-to-plane pseudo spin valves with Co 2FeAl1-xSix (0 ≤ x ≤ 1) Heusler alloy ferromagnetic layers and a Ag spacer layer to optimize x. The MR ratios at room temperature do not show x dependence, while the MR ratios measured at 5 K showed strong x dependence; the largest resistance change-area product ΔRA = 21 mΩ·μm2 was obtained for x = 1 and ΔRA decreased with decreasing x. The results apparently contradicts with the theoretical prediction that the highest spin polarization is attained for x = 0.5. The discrepancy is due to the structural origin that the L2 1 order is obtained only in the Co2FeSi alloy film.

UR - http://www.scopus.com/inward/record.url?scp=84885403827&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84885403827&partnerID=8YFLogxK

U2 - 10.1063/1.4821243

DO - 10.1063/1.4821243

M3 - Article

AN - SCOPUS:84885403827

SN - 0021-8979

VL - 114

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 12

M1 - 123910

ER -

Temperature dependence of magnetoresistive output of pseudo spin valves with Co₂Fe(Al_1-xSi_x) Heusler alloys and a Ag spacer

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this