Current-perpendicular-to-plane giant magnetoresistance in pseudo spin valves with Co2Fe(Ge0.5Ga0.5) heusler alloy ferromagnetic layers and Cu/Ag spacer

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

doi:10.1109/TMAG.2013.2251611

Current-perpendicular-to-plane giant magnetoresistance in pseudo spin valves with Co₂Fe(Ge_0.5Ga_0.5) heusler alloy ferromagnetic layers and Cu/Ag spacer

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

^*Corresponding author for this work

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

5 Citations (Scopus)

Abstract

We studied the transport properties and micro-structure of current-perpendicular-to-plane pseudo spin valves (PSVs) with ferromagnetic Co₂Fe}(Ge_0.5Ga_0.5) (CFGG) Heusler alloy layers and a Cu or Ag spacer. The CFGG/Cu/CFGG PSVs showed an optimum annealing temperature at 300°C, which is substantially lower than 500°C for CFGG/Ag/CFGG PSVs. The Valet-Fert analysis yielded comparable interfacial spin asymmetries in CFGG/Cu (or Ag)/CFGG PSVs, which indicates that the Cu spacer has as good a band matching as that of the Ag spacer with the CFGG Heusler alloy. However, transmission electron microscopy observation revealed that the CFGG/Cu/CFGG tri-layered structure is thermally unstable compared to the CFGG/Ag/CFGG tri-layered structure, thus placing a limit on the annealing temperature for producing higher magnetoresistance output by using the Cu spacer.

Original language	English
Article number	6558963
Pages (from-to)	4413-4416
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	49
Issue number	7
DOIs	https://doi.org/10.1109/TMAG.2013.2251611
Publication status	Published - 2013
Externally published	Yes

Keywords

CPP-GMR
Heusler alloy
magnetic read head

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/TMAG.2013.2251611

Cite this

@article{120099cb7d7d4e67bda838f2c33ea092,

title = "Current-perpendicular-to-plane giant magnetoresistance in pseudo spin valves with Co2Fe(Ge0.5Ga0.5) heusler alloy ferromagnetic layers and Cu/Ag spacer",

abstract = "We studied the transport properties and micro-structure of current-perpendicular-to-plane pseudo spin valves (PSVs) with ferromagnetic Co2Fe}(Ge0.5Ga0.5) (CFGG) Heusler alloy layers and a Cu or Ag spacer. The CFGG/Cu/CFGG PSVs showed an optimum annealing temperature at 300°C, which is substantially lower than 500°C for CFGG/Ag/CFGG PSVs. The Valet-Fert analysis yielded comparable interfacial spin asymmetries in CFGG/Cu (or Ag)/CFGG PSVs, which indicates that the Cu spacer has as good a band matching as that of the Ag spacer with the CFGG Heusler alloy. However, transmission electron microscopy observation revealed that the CFGG/Cu/CFGG tri-layered structure is thermally unstable compared to the CFGG/Ag/CFGG tri-layered structure, thus placing a limit on the annealing temperature for producing higher magnetoresistance output by using the Cu spacer.",

keywords = "CPP-GMR, Heusler alloy, magnetic read head",

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

year = "2013",

doi = "10.1109/TMAG.2013.2251611",

language = "English",

volume = "49",

pages = "4413--4416",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "7",

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T1 - Current-perpendicular-to-plane giant magnetoresistance in pseudo spin valves with Co2Fe(Ge0.5Ga0.5) heusler alloy ferromagnetic layers and Cu/Ag spacer

AU - Li, S.

AU - Goripati, H. S.

AU - Takahashi, Y. K.

AU - Furubayashi, T.

AU - Hono, K.

PY - 2013

Y1 - 2013

N2 - We studied the transport properties and micro-structure of current-perpendicular-to-plane pseudo spin valves (PSVs) with ferromagnetic Co2Fe}(Ge0.5Ga0.5) (CFGG) Heusler alloy layers and a Cu or Ag spacer. The CFGG/Cu/CFGG PSVs showed an optimum annealing temperature at 300°C, which is substantially lower than 500°C for CFGG/Ag/CFGG PSVs. The Valet-Fert analysis yielded comparable interfacial spin asymmetries in CFGG/Cu (or Ag)/CFGG PSVs, which indicates that the Cu spacer has as good a band matching as that of the Ag spacer with the CFGG Heusler alloy. However, transmission electron microscopy observation revealed that the CFGG/Cu/CFGG tri-layered structure is thermally unstable compared to the CFGG/Ag/CFGG tri-layered structure, thus placing a limit on the annealing temperature for producing higher magnetoresistance output by using the Cu spacer.

AB - We studied the transport properties and micro-structure of current-perpendicular-to-plane pseudo spin valves (PSVs) with ferromagnetic Co2Fe}(Ge0.5Ga0.5) (CFGG) Heusler alloy layers and a Cu or Ag spacer. The CFGG/Cu/CFGG PSVs showed an optimum annealing temperature at 300°C, which is substantially lower than 500°C for CFGG/Ag/CFGG PSVs. The Valet-Fert analysis yielded comparable interfacial spin asymmetries in CFGG/Cu (or Ag)/CFGG PSVs, which indicates that the Cu spacer has as good a band matching as that of the Ag spacer with the CFGG Heusler alloy. However, transmission electron microscopy observation revealed that the CFGG/Cu/CFGG tri-layered structure is thermally unstable compared to the CFGG/Ag/CFGG tri-layered structure, thus placing a limit on the annealing temperature for producing higher magnetoresistance output by using the Cu spacer.

KW - CPP-GMR

KW - Heusler alloy

KW - magnetic read head

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