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

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

2006-02-26

arxiv.org/abs/cond-mat/0602609v2

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, accepted for publication in Europhys. Lett

Scientific paper

10.1209/0295-5075/78/67002

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 80K and 600K. 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 ~ H_0 (T/T_0)/sinh(T/T_0) with a characteristic temperature of T_0 = 150K. Within this model, the Fermi velocity for the Ru layer is of the order of 10^5m/s, therefore, explaining the strong variation of the coupling strength with the temperature in Ru based AFi. Furthermore, a strong uniaxial anisotropy of K_u = 2x10^3 J/m^3 with a small angular distribution of the anisotropy axes is observed for the AFi trilayers based on amorphous CoFeB alloys.

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