Low temperature ordering and high (001) orientation of [Fe/Pt/Cu]18 multilayer films

Yu, Yongsheng; Li, Xingzhong; George, T. Adrian; Fei, W D; Li, Haibo; Sellmyer, David J.

doi:10.1016/j.tsf.2012.11.102

Cited by 11 publications

(3 citation statements)

References 30 publications

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“…Moreover, structural and magnetic properties of L1 0 ordered FePt sensitively depend on the relative concentration of Fe and Pt, approaches of synthesis, post-deposition treatments, film structure in an as-deposited state, etc [6][7][8][9][10][11]. Therefore, wide research interest is directed at the optimization of structural and magnetic properties of FePt by synthesizing FePt films in diverse structures via various synthesis routes [12][13][14]. Some of the key factors that influence the disorder-order transformation kinetics in FePt films are as follows: Recent experimental findings demonstrated that the addition of Cu causes lattice distortion favoring the L1 0 transformation and (001) texturing in the films [15,16].…”

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%

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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“…But further aspects such as magnetic properties, grain size, surface roughness, and pronounced (0 0 1) texture need to be taken into account as well [2,15,16]. One of the proposed approaches for the reduction of the ordering temperature is deposition of bi-layered or multilayered [Pt/Fe] n thin films followed by post-annealing [17][18][19]. Stress that occurs at interfaces due to the lattice mismatch and difference in thermal expansion coefficients of the layers could enhance diffusion and ordering processes [10,20,21].…”

Section: Introductionmentioning

confidence: 99%

Phase transformations in Pt/Fe bilayers during post annealing probed by resistometry

Shamis

Safonova

Voron

et al. 2019

J. Phys.: Condens. Matter

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X-ray diffraction (XRD), secondary neutral mass spectrometry (SNMS) depth profiling, and electrical resistivity measurements were used to follow the phase transformations in Pt/Fe bi-layered thin films during annealing. Initially, the electrical resistivity increases linearly with temperature up to 150 °C due to the contribution of phonon scattering of the metallic Pt and Fe bilayer. Further increase of the annealing temperature leads to a steeper linear increase, which is associated with the initial formation of the chemically disordered A1-phase followed by the formation of the chemically ordered L10-FePt phase, as confirmed by XRD and SNMS studies. Finally, at about 620 °C the single L10-FePt phase has formed throughout the film. Moreover, the electrical resistivity contains also the magnetic contribution to the total resistivity. In this case, the loss in magnetic order is indicated by a change in temperature dependence of the resistivity at about 310 °C, representing the Curie temperature of the initially formed A1-FePt alloy, while the finally formed L10-FePt alloy reveals a higher magnetic transition temperature of about 410 °C. In this study, it has been demonstrated that resistometry in combination with structural and chemical analysis provides valuable information on diffusion processes, structural phase formations and its stability range, as well as on the magnetic transition temperature.

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“…Devices based upon CoPt and FePt alloys with a strong magnetocrystalline anisotropy are essential in conventional magnetic recording media. Apart from these alloys, there have been quite a few earlier studies on Fe-Pt layer systems as well (Babonneau et al, 2008;Liu et al, 1998;Thienhausa et al, 2005;Zotov et al, 2008;Andreazza et al, 2015;Yu et al, 2013). However, one still needs to examine further the nanoscale behaviour of these systems with temperature for consequent possible changes in their properties from an application point of view.…”

Section: Introductionmentioning

confidence: 99%

Morphology of Fe nanolayers with Pt overlayers on low-temperature annealing

et al. 2016

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Agglomeration or dewetting is technologically important in the microelectronics industry as it is one of the methods of producing arrays of nanosized metal clusters. This report investigates the grain morphology evolution due to low‐temperature annealing (473 K) in Fe layers with Pt overlayers. X‐ray diffuse scattering and grazing‐incidence small‐angle X‐ray scattering (GISAXS) have been used to access different correlation lengths and correlate them with grain sizes from transmission electron microscopy. Overall, the GISAXS data indicate that the nanoparticles or nanoclusters in the samples appear as bimodal distributions. It is shown that, for an Fe layer with vertical grain sizes of 5 and 11 nm, irrespective of cluster size, there is no signature of agglomeration between the Fe and Pt layers even with very long annealing times (3000 min). The vertical grain sizes are mediated by the film thickness. Furthermore, an alternating variation with grain sizes of 4 and 7 nm is achieved by Al doping, but without a restriction on the Fe layer thickness. Even in this case, the agglomeration process is seen to remain unaffected by annealing for the same time durations, but only for the larger sized nanoclusters. The smaller ones are seen to grow in size, with increased correlation lengths for the maximum annealing time owing to higher surface energy.

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Low temperature ordering and high (001) orientation of [Fe/Pt/Cu]18 multilayer films

Cited by 11 publications

References 30 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

Phase transformations in Pt/Fe bilayers during post annealing probed by resistometry

Morphology of Fe nanolayers with Pt overlayers on low-temperature annealing

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