Effect of Annealing on Magnetization Reversal and Spin Dynamics in Co40Fe40B20 Thin Films

Sriram, K. and Pala, Jay and Haldar, Arabinda and Murapaka, Chandrasekhar and et al, . (2022) Effect of Annealing on Magnetization Reversal and Spin Dynamics in Co40Fe40B20 Thin Films. Journal of Superconductivity and Novel Magnetism. ISSN 1557-1939

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Gilbert damping is one of the critical parameters in magnetic thin films for developing low-power spintronic devices, and Co 40Fe 40B 20 (CFB) is one of the sought-after materials in this regard. Here, we report the effect of annealing on the structural, magnetization reversal, and spin dynamics of CFB thin films. X-ray diffraction results show that as-deposited films are amorphous and retain their nature upon annealing up to 350 °C. Magnetization reversal results exhibit anisotropic behavior in both as-deposited and annealed samples. The random anisotropy model explains the change in coercivity in the transverse axis with respect to the longitudinal axis for CFB annealed at 350 °C. Broadband ferromagnetic resonance spectra reveal that the damping parameter decreases with increasing annealing temperature. Ultra-low damping of 0.004 is obtained with annealing at 350 °C. Surface topographical images from atomic force microscopy are rewarded for supporting the observed variation of the damping constant. Our systematic study gives an insight into CFB magnetization reversal and dynamics for developing ultra-low damping magnetic thin films via annealing. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

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IITH Creators:
IITH CreatorsORCiD
Haldar, Arabinda0000-0002-0490-9719
Murapaka, ChandrasekharUNSPECIFIED
Item Type: Article
Additional Information: CM would like to acknowledge funding from the SERB-Early Career Research Award (ECR/2018/002664) and the Board of Research in Nuclear Sciences, India (58/14/04/2022-BRNS). AH would like to acknowledge funding from the Board of Research in Nuclear Sciences, India (DAE-YSRA 59/20/05/2021-BRNS). KS would like to acknowledge the fellowship from the SERB project (ECR/2018/002664). BP would like to acknowledge a fellowship from the Department of Science and Technology, India (DST/INSPIRE Fellowship/ [IF180927]). The authors would like to thank Miss. Savita Sahu for helping in measurements.
Uncontrolled Keywords: Annealing; CoFeB; Ferromagnetic resonance; Gilbert damping; Magnetization dynamics
Subjects: Others > Metallurgy Metallurgical Engineering
Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 23 Nov 2022 11:05
Last Modified: 23 Nov 2022 11:05
URI: http://raiith.iith.ac.in/id/eprint/11371
Publisher URL: http://doi.org/10.1007/s10948-022-06442-y
OA policy: https://v2.sherpa.ac.uk/id/publication/14419
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