Effect of thermally induced structural and compositional transformations on magnetic properties in FeMn/(Fe, Co, Ni, Fe20Ni80, Fe11Ni89, Co30Ni70) films

Vas’kovskiy, V. O.; Gorkovenko, A. N.; Кулеш, Н. А.; Lepalovskij, V. N.; Moskalev, M. E.

doi:10.1016/j.tsf.2022.139616

Cited by 2 publications

(1 citation statement)

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“…Over the years, permalloy has been a primary choice for fundamental research on magnetism and extensively used in cutting-edge technologies such as ultra-fast data storage devices like MRAM and racetrack memory, read/write head sensors, fluxgate sensors and high-frequency microwave devices [7,[18][19][20][21][22][23]. The characteristics of efficient magnetization switching and low gilbert damping are intricately linked to alloy composition, deposition method, substrate material, doping, , film thickness and annealing conditions [11,13,[24][25][26][27][28][29]. For electronics applications like high-frequency microwave filters and inductors, thicker films are preferred due to their enhanced performance characteristics [30].…”

Section: Introductionmentioning

confidence: 99%

Magnetization dynamics and domain reversal in electrodeposited permalloy thin films: impact of thickness and annealing treatment

Dev,

Reddy,

Medwal

et al. 2024

Phys. Scr.

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The domain reversal and magnetization dynamics of electrodeposited permalloy (Fe20Ni80) thin films on conducting ITO/glass substrate was investigated using Magneto-optic Kerr effect microscopy and ferromagnetic resonance. Permalloy thin films were electrodeposited with thickness ranging from 66 nm to 330 nm. Synchrotron XRD confirmed the deposited permalloy in FCC phase without any impurity. The squared hysteresis with very low coercivity (Hc ~ 5 Oe) established soft magnetic nature of the films. Further, angular MOKE hysteresis measurements with simultaneous domain imaging revealed four-fold surface anisotropy in as-deposited film ensuing magnetization reversal via branched and ripple domains. The annealing treatment in Ar+H2 atmosphere removed surface anisotropy and renovated the magnetization reversal through 180˚ branched domains with rapid magnetization switching. Ferromagnetic resonance spectroscopy discloses reduction in the gyromagnetic ratio (γ) as well as in Gilbert damping parameter (α) as the film thickness increases. The lowest Gilbert damping for 330 nm film measured at 0.022, which further reduced to 0.018 after annealing. The combination of rapid magnetization switching and low Gilbert damping in the electrodeposited permalloy thin films render them promising for implementation in high-frequency microwave devices devices and magnetic sensors.

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