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28 March 2024 |
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Structural and magnetic properties of co-sputtered Fe0.8C0.2 thin films | Prabhat Kumar
; V. R. Reddy
; V. Ganesan
; I. Sergueev
; O. Leupold
; H.-C. Wille
; Mukul Gupta
; | Date: |
11 Jul 2019 | Abstract: | We studied the structural and magnetic properties of FeC~thin films
deposited by co-sputtering of Fe and C targets in a direct current magnetron
sputtering (dcMS) process at a substrate temperature (Ts) of 300, 523 and
773,K. The structure and morphology was measured using x-ray diffraction
(XRD), x-ray absorption near edge spectroscopy (XANES) at Fe $L$ and C
$K$-edges and atomic/magnetic force microscopy (AFM, MFM), respectively. An
ultrathin (3,nm) $^{57}$FeC~layer, placed between relatively thick
FeC~layers was used to estimate Fe self-diffusion taking place during growth
at different Ts~using depth profiling measurements. Such $^{57}$FeC~layer was
also used for $^{57}$Fe conversion electron M"{o}ssbauer spectroscopy (CEMS)
and nuclear resonance scattering (NRS) measurements, yielding the magnetic
structure of this ultrathin layer. We found from XRD measurements that the
structure formed at low Ts~(300,K) is analogous to Fe-based amorphous alloy
and at high Ts~(773,K), pre-dominantly a ifc~phase has been formed.
Interestingly, at an intermediate Ts~(523,K), a clear presence of
efc~(along with ifc~and Fe) can be seen from the NRS spectra. The
microstructure obtained from AFM images was found to be in agreement with XRD
results. MFM images also agrees well with NRS results as the presence of
multi-magnetic components can be clearly seen in the sample grown at Ts~=
523,K. The information about the hybridization between Fe and C, obtained from
Fe $L$ and C $K$-edges XANES also supports the results obtained from other
measurements. In essence, from this work, experimental realization of efc~has
been demonstrated. It can be anticipated that by further fine-tuning the
deposition conditions, even single phase efc~phase can be realized which
hitherto remains an experimental challenge. | Source: | arXiv, 1907.5150 | Services: | Forum | Review | PDF | Favorites |
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