2006/02/28 by N. Wiese, T. Dimopoulos, Théodoros Dimopoulos +8
Materials Science · Physics and Astronomy · #Magnetic Properties and Applications #Magnetic and transport properties of perovskites and related materials #Magnetic properties of thin films #cond-mat.mtrl-sci
paper · pdf · doi:10.1209/0295-5075/78/67002
4 pages, 4 figures, accepted for publication in Europhys. Lett
openalex publication_date 2007/05/25 · arxiv created 2007/06/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
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 H sat behaves like H sat ∝ H 0 ( T / T 0 )/sinh( T / T 0 ) with a characteristic temperature of T 0 ≈ 150 K. Within this model, the Fermi velocity for the Ru layer is of the order of 10 5 m/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 = 2 × 10 3 J/m 3 with a small angular distribution of the anisotropy axes is observed for the AFi trilayers based on amorphous CoFeB alloys.