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

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Abstract

Gilbert damping is one of the critical parameters in magnetic thin films for developing low-power spintronic devices, and \({\mathrm{Co}}_{40}{\mathrm{Fe}}_{40}{\mathrm{B}}_{20}\) (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.

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Acknowledgements

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.

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  1. Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, 502284, Telangana, India

    K. Sriram, Jay Pala, Rohiteswar Mondal, Bibekananda Paikaray & Chandrasekhar Murapaka

  2. EPR and Magnetic Fluids Group, Faculty of Physical Science, CSIR-National Physical Laboratory, 110012, New Delhi, India

    Komal Jain & G. A. Basheed

  3. Department of Physics, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, 502284, Telangana, India

    Arabinda Haldar

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Sriram, K., Pala, J., Mondal, R. et al. Effect of Annealing on Magnetization Reversal and Spin Dynamics in Co40Fe40B20 Thin Films. J Supercond Nov Magn 36, 155–162 (2023). https://doi.org/10.1007/s10948-022-06442-y

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