Strong temperature dependence of antiferromagnetic coupling in CoFeB/Ru/CoFeB

N. Wiese; T. Dimopoulos; M. Rührig; J. Wecker; G. Reiss; J. Sort; J. Nogués

doi:10.1209/0295-5075/78/67002

Strong temperature dependence of antiferromagnetic coupling in CoFeB/Ru/CoFeB

N. Wiese, T. Dimopoulos, M. Rührig, J. Wecker, G. Reiss, J. Sort, J. Nogués

Department of Physics

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Abstract

The temperature dependence of saturation and spin-flop fields for artificial ferrimagnets (AFi) based on antiparallel coupled CoFeB/Ru/CoFeB trilayers has been investigated in a temperature range between 80 K and 600 K. The results presented in this paper are relevant for magnetic devices using this system, e.g. magnetic-random access memory based on spin-flop switching. In good accordance to the theory, the saturation field Hsat behaves like Hsat ∝ H0(T/T0)/sinh(T/T0) with a characteristic temperature of T0 ≈ 150 K. Within this model, the Fermi velocity for the Ru layer is of the order of 105 m/s, therefore, explaining the strong variation of the coupling strength with the temperature in Ru-based AFi. Furthermore, a strong uniaxial anisotropy of Ku ≤ 2 × 103 J/m3 with a small angular distribution of the anisotropy axes is observed for the AFi trilayers based on amorphous CoFeB alloys. © Europhysics Letters Association.

Original language	English
Article number	67002
Pages (from-to)	1-1
Journal	Europhysics Letters
Volume	78
Issue number	6
DOIs	https://doi.org/10.1209/0295-5075/78/67002
Publication status	Published - 1 Jun 2007

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title = "Strong temperature dependence of antiferromagnetic coupling in CoFeB/Ru/CoFeB",

abstract = "The temperature dependence of saturation and spin-flop fields for artificial ferrimagnets (AFi) based on antiparallel coupled CoFeB/Ru/CoFeB trilayers has been investigated in a temperature range between 80 K and 600 K. The results presented in this paper are relevant for magnetic devices using this system, e.g. magnetic-random access memory based on spin-flop switching. In good accordance to the theory, the saturation field Hsat behaves like Hsat ∝ H0(T/T0)/sinh(T/T0) with a characteristic temperature of T0 ≈ 150 K. Within this model, the Fermi velocity for the Ru layer is of the order of 105 m/s, therefore, explaining the strong variation of the coupling strength with the temperature in Ru-based AFi. Furthermore, a strong uniaxial anisotropy of Ku ≤ 2 × 103 J/m3 with a small angular distribution of the anisotropy axes is observed for the AFi trilayers based on amorphous CoFeB alloys. {\textcopyright} Europhysics Letters Association.",

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T1 - Strong temperature dependence of antiferromagnetic coupling in CoFeB/Ru/CoFeB

AU - Wiese, N.

AU - Dimopoulos, T.

AU - Rührig, M.

AU - Wecker, J.

AU - Reiss, G.

AU - Sort, J.

AU - Nogués, J.

PY - 2007/6/1

Y1 - 2007/6/1

N2 - The temperature dependence of saturation and spin-flop fields for artificial ferrimagnets (AFi) based on antiparallel coupled CoFeB/Ru/CoFeB trilayers has been investigated in a temperature range between 80 K and 600 K. The results presented in this paper are relevant for magnetic devices using this system, e.g. magnetic-random access memory based on spin-flop switching. In good accordance to the theory, the saturation field Hsat behaves like Hsat ∝ H0(T/T0)/sinh(T/T0) with a characteristic temperature of T0 ≈ 150 K. Within this model, the Fermi velocity for the Ru layer is of the order of 105 m/s, therefore, explaining the strong variation of the coupling strength with the temperature in Ru-based AFi. Furthermore, a strong uniaxial anisotropy of Ku ≤ 2 × 103 J/m3 with a small angular distribution of the anisotropy axes is observed for the AFi trilayers based on amorphous CoFeB alloys. © Europhysics Letters Association.

AB - The temperature dependence of saturation and spin-flop fields for artificial ferrimagnets (AFi) based on antiparallel coupled CoFeB/Ru/CoFeB trilayers has been investigated in a temperature range between 80 K and 600 K. The results presented in this paper are relevant for magnetic devices using this system, e.g. magnetic-random access memory based on spin-flop switching. In good accordance to the theory, the saturation field Hsat behaves like Hsat ∝ H0(T/T0)/sinh(T/T0) with a characteristic temperature of T0 ≈ 150 K. Within this model, the Fermi velocity for the Ru layer is of the order of 105 m/s, therefore, explaining the strong variation of the coupling strength with the temperature in Ru-based AFi. Furthermore, a strong uniaxial anisotropy of Ku ≤ 2 × 103 J/m3 with a small angular distribution of the anisotropy axes is observed for the AFi trilayers based on amorphous CoFeB alloys. © Europhysics Letters Association.

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DO - 10.1209/0295-5075/78/67002

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EP - 1

JO - Europhysics Letters

JF - Europhysics Letters

IS - 6

M1 - 67002

ER -

Strong temperature dependence of antiferromagnetic coupling in CoFeB/Ru/CoFeB

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