Ta interfaced CoFeB: Role of CoFeB thickness and thermal annealing in modification of structural and magnetic properties

Vardhan, Harsh; Srihari, Velaga; Sharma, Kavita; Singh, Surendra; Gupta, Mukul; Reddy, ‬V. Raghavendra; Das, Sadhan Chandra; Gome, Anil; Gupta, Ajay; Sharma, Gagan

doi:10.1016/j.surfin.2023.103156

Cited by 1 publication

(1 citation statement)

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“…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%

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: Introductionmentioning

confidence: 99%