Tailoring structural and magnetic viz. static and dynamic properties of soft magnetic CoFeB film with Ta incorporation

Vardhan, Harsh; Singh, Surendra; Gupta, Surbhi; Sharma, Kavita; Jafri, Yasmeen; Gupta, Mukul; Reddy, V. Raghavendra; Rawat, R.S.; Gupta, Ajay; Gome, Anil; Sharma, Gagan

doi:10.1016/j.jallcom.2022.166357

Cited by 7 publications

(3 citation statements)

References 63 publications

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“…Mr/Ms and the ratio of soft and hard phases infer that the value of the out-of-plane component of magnetization is highest for S2. In fact, in some of the recent studies too, variation of Mr/Ms is considered for quantitative investigation of magnetic anisotropy [34,43]. These results can be attributed to the microstructures of the films as observed from GIXRD measurements.…”

Section: Resultsmentioning

confidence: 99%

“…For atomic level investigation of the L1 0 transformation kinetics in the films, x-ray reflectivity (XRR) and Secondary Ion Mass Spectrometry (SIMS), were used. Both of these techniques have sub-nanometer depth selectivity and are thus, ideal tools for the present investigation [34][35][36][37]. Using these techniques, we carried out depth profiling of multilayer and alloy films and studied the evolution of the FePt phase in the films as a function of annealing time during RTA.…”

Section: Introductionmentioning

confidence: 99%

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Atomic level mechanism of disorder-order transformation kinetics at nanoscale in FePt based systems

Kumar,

Tiwari,

Gupta

et al. 2024

Phys. Scr.

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L10 ordered FePt is one of the most promising materials for spintronic and recording media applications. In the present work, the mechanism of L10 phase transformation in FePt based films with varying initial structures is examined at the nanoscale to understand the ordering process using synchrotron based GIXRD, MOKE, VSM, and techniques with sub nanometer depth selectivity like XRR and SIMS. Precisely controlled compositions of the films are deposited using magnetron sputtering. Rapid thermal annealing is used for post-deposition processing. It is evaluated experimentally that for a shorter annealing time of 70 s at 400oC, besides volume diffusion, short circuit diffusion paths along the intercrystallite region owing to the presence of nanostructured grains play a dominant role in alloying behavior. A study of the L10 ordering process reveals the crucial role of film structure in controlling the transformation kinetics, texturing of nanograins, and magnetic coercivity. Diffusion studies disclose that type B diffusion kinetics is activated for the annealing time during which L10 transformation occurs in the films.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Atomic level mechanism of disorder-order transformation kinetics at nanoscale in FePt based systems

Kumar,

Tiwari,

Gupta

et al. 2024

Phys. Scr.

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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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Effects of interfacial oxygen diffusion on the magnetic properties and thermal stability of Pd/CoFeB/Pd/Ta heterostructure

Lakshmanan,

Romanque,

Mery

et al. 2024

Journal of Alloys and Compounds

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Tailoring structural and magnetic viz. static and dynamic properties of soft magnetic CoFeB film with Ta incorporation

Cited by 7 publications

References 63 publications

Atomic level mechanism of disorder-order transformation kinetics at nanoscale in FePt based systems

Atomic level mechanism of disorder-order transformation kinetics at nanoscale in FePt based systems

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

Effects of interfacial oxygen diffusion on the magnetic properties and thermal stability of Pd/CoFeB/Pd/Ta heterostructure

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