Thermal stability of spin valve with NiO/α-Fe2O3 bilayer antiferromagnets

Junichi Fujikata; Kazuhiko Hayashi; Mikiko Saito; Masafumi Nakada

doi:10.1109/20.706324

Thermal stability of spin valve with NiO/α-Fe₂O₃ bilayer antiferromagnets

Junichi Fujikata^*, Kazuhiko Hayashi, Mikiko Saito, Masafumi Nakada

^*Corresponding author for this work

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

6 Citations (Scopus)

Abstract

To enhance the thermal stability of the NiO pinning layers for spin valves, α -Fe₂O₃ layers, of which the Neel temperature is 680°C for bulk, are deposited on NiO layers. With 15-80 Å thick α-Fe₂O₃ layers on NiO layers, an exchange anisotropy field about five times larger than that of NiO/NiFe is obtained after 250°C thermal annealing. Spin valve multilayers with NiO/α-Fe₂O₃ antiferromagnets show about 12% MR ratio. After 150°C annealing, MR ratio changes less than 20% for patterned spin valve multilayers with abutted junctioned hard magnets.

Original language	English
Pages (from-to)	954-956
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	34
Issue number	4 PART 1
DOIs	https://doi.org/10.1109/20.706324
Publication status	Published - 1998
Externally published	Yes

Keywords

Nio, spin valve
Thermal stability
α-feo

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/20.706324

Cite this

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title = "Thermal stability of spin valve with NiO/α-Fe2O3 bilayer antiferromagnets",

abstract = "To enhance the thermal stability of the NiO pinning layers for spin valves, α -Fe2O3 layers, of which the Neel temperature is 680°C for bulk, are deposited on NiO layers. With 15-80 {\AA} thick α-Fe2O3 layers on NiO layers, an exchange anisotropy field about five times larger than that of NiO/NiFe is obtained after 250°C thermal annealing. Spin valve multilayers with NiO/α-Fe2O3 antiferromagnets show about 12% MR ratio. After 150°C annealing, MR ratio changes less than 20% for patterned spin valve multilayers with abutted junctioned hard magnets.",

keywords = "Nio, spin valve, Thermal stability, α-feo",

author = "Junichi Fujikata and Kazuhiko Hayashi and Mikiko Saito and Masafumi Nakada",

note = "Funding Information: Part of this work was carried out under the management of ASET in the MITI{\textquoteright}s R&D program supported by NEDQ",

year = "1998",

doi = "10.1109/20.706324",

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volume = "34",

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journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

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T1 - Thermal stability of spin valve with NiO/α-Fe2O3 bilayer antiferromagnets

AU - Fujikata, Junichi

AU - Hayashi, Kazuhiko

AU - Saito, Mikiko

AU - Nakada, Masafumi

N1 - Funding Information: Part of this work was carried out under the management of ASET in the MITI’s R&D program supported by NEDQ

PY - 1998

Y1 - 1998

N2 - To enhance the thermal stability of the NiO pinning layers for spin valves, α -Fe2O3 layers, of which the Neel temperature is 680°C for bulk, are deposited on NiO layers. With 15-80 Å thick α-Fe2O3 layers on NiO layers, an exchange anisotropy field about five times larger than that of NiO/NiFe is obtained after 250°C thermal annealing. Spin valve multilayers with NiO/α-Fe2O3 antiferromagnets show about 12% MR ratio. After 150°C annealing, MR ratio changes less than 20% for patterned spin valve multilayers with abutted junctioned hard magnets.

AB - To enhance the thermal stability of the NiO pinning layers for spin valves, α -Fe2O3 layers, of which the Neel temperature is 680°C for bulk, are deposited on NiO layers. With 15-80 Å thick α-Fe2O3 layers on NiO layers, an exchange anisotropy field about five times larger than that of NiO/NiFe is obtained after 250°C thermal annealing. Spin valve multilayers with NiO/α-Fe2O3 antiferromagnets show about 12% MR ratio. After 150°C annealing, MR ratio changes less than 20% for patterned spin valve multilayers with abutted junctioned hard magnets.

KW - Nio, spin valve

KW - Thermal stability

KW - α-feo

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