A detailed comparative Ferromagnetic resonance study of pulsed laser deposited Co40Fe40B20 thin films, before and after annealing, was under taken. The dependence of resonance field (Hres) and peak-to-peak linewidth (ΔHpp) on film thickness, annealing temperature, and magnetic field orientation is examined. ‘In-plane’ (IP) and ‘out-of-plane’ (OP) angular dependence of the resonance fields, (IP:Hres(ψ); OP:Hres(α)), were measured at T = 150 and 295 K for the as deposited (as-) to annealed (an-) thin film samples to determine IP and OP uniaxial anisotropy fields. Variation of Hres(ψ) and Hres(α) on sample geometry demonstrate that the uniaxial magnetic anisotropy is present in as- and an-thin films of Co40Fe40B20. The effective magnetic anisotropy increases after nanocrystallization in CoFeB films indicates that the exchange interactions are unable to average out the local-magnetocrystalline anisotropy of the nanocrystalline grains and thereby lead to magnetic hardening in the early stages of crystallization.
Origin of ‘in-plane’ and ‘out-of-plane’ magnetic anisotropies in as-deposited and annealed CoFeB ferromagnetic thin films
G. Venkat Swamy, R. K. Rakshit, R. P. Pant, G. A. Basheed; Origin of ‘in-plane’ and ‘out-of-plane’ magnetic anisotropies in as-deposited and annealed CoFeB ferromagnetic thin films. J. Appl. Phys. 7 May 2015; 117 (17): 17A312. https://doi.org/10.1063/1.4913723
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