Abstract
Magnetic thin films with fast magnetization switching and low Gilbert dam** are crucial for devices working at high frequency with low power consumption. In this work, composition-controlled high-quality Fe–Ni alloy thin films were electrodeposited on ITO/glass substrates and their magnetization switching behavior was investigated using MOKE and FMR. The phase of deposited alloy transformed from FCC to mixed BCC and FCC for high Fe content films. All the deposited alloy films display granular morphology and possess soft magnetic characteristics with low coercivity (Hc < 50 Oe). Magneto-optic Kerr effect hysteresis along with simultaneous domain imaging reveals that the alloy composition influences anisotropy, domain structure, and magnetization switching process. The alloyed films exhibited fourfold surface anisotropy. The magnetization reversal in pure Fe and Ni samples occurs through stripe-like domains, whereas band and ripple-like domains were evident for the alloyed films. Fast magnetization switching within a minimum field range of ~ 3 Oe was observed for Fe25Ni75 sample. The ferromagnetic resonance measurements revealed that the Fe25Ni75 alloy films exhibit lowest Gilbert dam** (α = 0.024) compared to pure Fe and Ni films. In summary, these findings offer valuable insight for tailoring the magnetic properties of Fe–Ni alloy thin films with appropriate alloy composition.
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Acknowledgements
We would like to acknowledge Prof. C. L. Dong, Tamkang University, Taiwan, for their help during synchrotron XRD measurements
Funding
The authors gratefully acknowledge the financial support provided by SERB-DST, India, for the project “Magneto-Optic and Magnetic Multilayers” (EMR/2016002437) and Institute of Eminence (IoE) project (IoE/2023–24/12/FRP), University of Delhi, India. We extend our appreciation to the Ministry of Education (MoE) National Science and Technology Council (NSTC), Taiwan, for the financial support through grant no. 110–2112-M-032–013-MY3). Author K. Dev gratefully acknowledges Council of Scientific and Industrial Research (CSIR), India, for the financial support in the form of fellowship.
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Kapil Dev: Writing – original draft, Data curation, Investigation, Formal analysis. Ankit Kadian: Investigation, Formal analysis. V.R. Reddy: Resources, Validation. Rohit Medwal: Resources, Data curation, Validation. S. Annapoorni: Conceptualization, Validation, Funding acquisition.
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Dev, K., Kadian, A., Reddy, V.R. et al. Magnetization Switching Dynamics of Electrodeposited Fe–Ni Thin Films. J Supercond Nov Magn 37, 1243–1255 (2024). https://doi.org/10.1007/s10948-024-06766-x
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DOI: https://doi.org/10.1007/s10948-024-06766-x