Investigation into the suitability of a reactive pulsed laser process for the deposition of iron nitride thin films

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2002-01-01
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Ulmer, Kurt
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Materials Science and Engineering
Materials engineers create new materials and improve existing materials. Everything is limited by the materials that are used to produce it. Materials engineers understand the relationship between the properties of a material and its internal structure — from the macro level down to the atomic level. The better the materials, the better the end result — it’s as simple as that.
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Iron nitride thin films have shown some promise of being excellent materials for some magnetic applications. The introduction of nitrogen into iron thin films can greatly affect the film stress, microstructure, and magnetic properties. A useful soft magnetic iron nitride material would have a low coercivity, small grain size and low film stress. One metastable phase in the Fe:N system, α"- Fe16N2, has been reported to have a magnetic moment in excess of that of pure Fe. Films produced by several different deposition methods including sputtering and MBE have often consisted of mixed phases and have been very difficult to produce. To address this issue, reactive Pulsed Laser Deposition (PLD) was chosen as the technique for producing Fe:N films in this study. PLD is well known to be capable of producing non-equilibrium phases. Nitrogen incorporation into α iron films was demonstrated and observed by x-ray diffraction analysis in a shift in 20 peak position. The existence of an enhanced magnetic moment was not clearly demonstrated. This was attributed to the incorporated nitrogen being in a disordered state. Further processing promises yield films containing ordered α"- Fe16N2 with an enhanced magnetic moment.

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Tue Jan 01 00:00:00 UTC 2002