Study of non-magnetic iron mononitride thin films

Gupta, Mukul; Tayal, Akhil; Gupta, Ajay; Reddy, ‬V. Raghavendra; Horisberger, M.; Stahn, J.

doi:10.1016/j.jallcom.2011.04.139

Cited by 32 publications

(44 citation statements)

References 47 publications

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“…It was reported that Ms increase with decreasing lattice mismatch [5]. It was found that magnetization measurements of γ 0 -Fe 4 N vary between a magnetic moment of 2.17 μ B per Fe atom (RF sputtering in ammonia gas on Si wafers and kapton substrates) [36], and values as high as 1980 720 emu/cm 3 corresponding to 2.9 μ B per Fe atom (DC sputtering in an Ar/N 2 gas mixture on LaAlO 3 substrates) [1]. This strongly increased magnetic moment has been attributed to the low lattice mismatch between LaAlO 3 and γ 0 -Fe 4 N. The values of substrate-film lattice mismatch (δ) for the samples in the present work were also calculated from XRD results.…”

Section: Resultsmentioning

confidence: 99%

“…It is well known that nitrogen-poor phases, such as α 0 -Fe(N), γ 0 -Fe 4 N, ε-Fe 2-3 N and α″-Fe 16 N 2 are magnetic phases [1][2][3][4]. In particular, γ 0 -Fe 4 N is well known as a cubic, with the Fe-sublattice arranged in a face centered cubic (fcc) structure and nitrogen atoms occupying the body centered position one out of four, which corresponds to an antiperovskite structure Fe 3 FeN.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of γ′-Fe4N thin films deposited on Si(1 0 0) and GaAs(1 0 0) substrates by facing target magnetron sputtering

Xiang

et al. 2015

Journal of Crystal Growth

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of γ′-Fe4N thin films deposited on Si(1 0 0) and GaAs(1 0 0) substrates by facing target magnetron sputtering

Xiang

et al. 2015

Journal of Crystal Growth

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“…According to the calculations, as stoichiometric phases, both should have a N content of (214) 50 at.% N but with dierent congurations inside the fcc Fe cage. The two structures correspond to the ZnS-type for γ -FeN phase and a NCl-type for the γ -FeN [2,4]. The inuence of time exposure was also studied.…”

Section: Resultsmentioning

confidence: 99%

“…The study of the Fe-N phase diagram is a matter of interest in the eld of basic research [1,2] and for applications, particularly as magnetic materials in the eld of spintronics [3]. In this work we present new methods of growing of α -Fe 16 N 2 , FeN y (y > 0.5) and we focus on the identication of their phases and their transformation to ε-phase.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Study of α" and γ"-Phases of Iron Nitride Thin Films

2014

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Most of the Fenitride phases have been studied in much detail. Nevertheless, there is still a debate about the most ecient, exact and controlled way of obtaining thin lms of the desired iron nitride phases. Thin lms of iron nitrides were deposited by Molecular Beam Epitaxy in Ultra High Vacuum. By changing the growth parameters we tried to obtain the α -phase in its purest form. We worked also on iron mononitride, FeN (γ -FeN) which is known to exist in dierent phases. The stoichiometry of the samples was determined by means of resonant Rutherford Backscattering Spectroscopy. The samples were studied by room temperature Conversion Electron Mössbauer Spectroscopy. We achieved as much as 24% of pure α -phase and provide evidence of the existence of γ -FeN with vacancies and of the transformation of nonmagnetic γ -phase into magnetic ε-phase after time exposure.

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“…From CEMS and XAS measurements (shown later), it was confirmed that the formed phase is γ ′′′ -FeN having ZnS-type structure oriented along (220) plane. 14,17 After annealing at 475 K, a shift in the peak position towards higher angle was observed. However, the XRD pattern of sample annealed at 525 K is almost identical to that of previously annealed sample.…”

Section: Methodsmentioning

confidence: 96%

Origin of anomalous diffusion in iron mononitride thin films

Tayal

Gupta

et al. 2015

Phys. Rev. B

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We have studied the origin of a counter intuitive diffusion behavior of Fe and N atoms in a iron mononitride (FeN) thin film. It was observed that in-spite of a larger atomic size, Fe tend to diffuse more rapidly than smaller N atoms. This only happens in the N-rich region of Fe-N phase diagram, in the N-poor regions, N diffusion coefficient is orders of magnitude larger than Fe. Detailed selfdiffusion measurements performed in FeN thin films reveal that the diffusion mechanism of Fe and N is different -Fe atoms diffuse through a complex process, which in addition to a volume diffusion, pre-dominantly controlled by a fast grain boundary diffusion. On the other hand N atoms diffuse through a classical volume-type diffusion process. Observed results have been explained in terms of stronger Fe-N (than Fe-Fe) bonds generally predicted theoretically for mononitride compositions of transition metals.

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Study of non-magnetic iron mononitride thin films

Cited by 32 publications

References 47 publications

Investigation of γ′-Fe4N thin films deposited on Si(1 0 0) and GaAs(1 0 0) substrates by facing target magnetron sputtering

Investigation of γ′-Fe4N thin films deposited on Si(1 0 0) and GaAs(1 0 0) substrates by facing target magnetron sputtering

Magnetic Study of α" and γ"-Phases of Iron Nitride Thin Films

Origin of anomalous diffusion in iron mononitride thin films

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