Thin films of Co1.7Fe1.3O4prepared by radio frequency sputtering – the first step towards their spinodal decomposition

Bui, Thi Mai Anh; Trong, H. Le; Presmanes, Lionel; Barnabé, Antoine; Bonningue, Corine; Tailhades, Philippe

doi:10.1039/c3ce42588f

Cited by 12 publications

(18 citation statements)

References 22 publications

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“…2. Films deposited at 0.5 and 1.0 Pa have similar spectra, which are exactly the same as the spectrum of a pure Co 1.7 Fe 1.3 O 4 ceramic that we have already published elsewhere [33]. The spectra exhibit five Raman-active modes of spinel structure [34,35] in this spectral range: 3F 2g (185, 325 and 640 cm −1 ), E g (490 cm −1 ) and A 1g (695 cm −1 ).…”

Section: Structural Characterizationssupporting

confidence: 56%

“…In addition, a high number of collisions between particles ejected in the plasma induces a great 'thermalization' of oxygen atoms which are lighter and much more captured by pumping system than metal atoms. Accordingly, sputtering at high argon pressure shows an impoverishment of the oxygen content in the deposited films [33]. Difference in phase component for obtained films was also investigated by Raman spectroscopy and the resulting spectra are depicted in Fig.…”

Section: Structural Characterizationsmentioning

confidence: 99%

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Preparation of iron cobaltite thin films by RF magnetron sputtering

et al. 2015

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International audienceIron cobaltite thin films with spinel structure have been elaborated by radio-frequency (RF) magnetronsputtering from a Co1.75Fe1.25O4 target. Influence of argon pressure on structure, microstructure and physicalproperties of films has been examined. Iron–cobalt oxide thin films essentially consist of one spinel phasewhen deposited at low pressure (0.5 and 1.0 Pa). At high pressure (2.0 Pa), the global stoichiometry of the filmis changed which results in the precipitation of a mixed monoxide of cobalt and iron beside the spinel phase.This in-situ reduction due to an oxygen loss occurring mainly at high deposition pressure has been revealed byX-ray diffraction and Raman spectroscopy. Microstructural evolution of thin film with argon pressure has beenshown by microscopic observations (AFM and SEM). The evolution of magnetic and electrical properties, versusargon pressure, has been also studied by SQUID and 4 point probe measurements

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Section: Structural Characterizationssupporting

confidence: 56%

Section: Structural Characterizationsmentioning

confidence: 99%

Preparation of iron cobaltite thin films by RF magnetron sputtering

et al. 2015

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“…The RF power was lowered at 50 W to avoid target reduction [54], and the pressure inside the chamber was lower than 2 × 10 −5 Pa before deposition. During the deposition of the films, the target-to-substrate distance was fixed at 7 cm (Table 1).…”

Section: Methodsmentioning

confidence: 99%

Highly Sensitive Sputtered ZnO:Ga Thin Films Integrated by a Simple Stencil Mask Process on Microsensor Platforms for Sub-ppm Acetaldehyde Detection

Presmanes

Thimont

Chapelle

et al. 2017

Sensors

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The integration of a 50-nm-thick layer of an innovative sensitive material on microsensors has been developed based on silicon micro-hotplates. In this study, integration of ZnO:Ga via radio-frequency (RF) sputtering has been successfully combined with a low cost and reliable stencil mask technique to obtain repeatable sensing layers on top of interdigitated electrodes. The variation of the resistance of this n-type Ga-doped ZnO has been measured under sub-ppm traces (500 ppb) of acetaldehyde (C2H4O). Thanks to the microheater designed into a thin membrane, the generation of very rapid temperature variations (from room temperature to 550 °C in 25 ms) is possible, and a rapid cycled pulsed-temperature operating mode can be applied to the sensor. This approach reveals a strong improvement of sensing performances with a huge sensitivity between 10 and 1000, depending on the working pulsed-temperature level.

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“…SD is a general phenomenon observed in various systems, such as alloys, glasses, and oxides. It is well-established theoretically and experimentally that SD could occur generally in material systems whose phase diagram shows a miscibility gap, such as Al 2 O 3 -Cr 2 O 3 [9], TiO 2 -SnO 2 [10], HfO 2 -SiO 2 [11], and CoFe 2 O 4 -Co 3 O 4 [12,13]. …”

Section: Introductionmentioning

confidence: 99%

“…For example, the preparation of spinodally decomposed thin films of spinel-structured cobalt ferrite (Co ferrite) thin films by long-time post-deposition annealing has already been established [12,13]. However, several-steps synthesis procedures are detrimental to the fabrication of these materials in large scale for commercial applications.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-field-induced phase separation via spinodal decomposition in epitaxial manganese ferrite thin films

Debnath

Kawaguchi

Das

et al. 2018

Science and Technology of Advanced Materials

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In this study, we report about the occurrence of phase separation through spinodal decomposition (SD) in spinel manganese ferrite (Mn ferrite) thin films grown by Dynamic Aurora pulsed laser deposition. The driving force behind this SD in Mn ferrite films is considered to be an ion-impingement-enhanced diffusion that is induced by the application of magnetic field during film growth. The phase separation to Mn-rich and Fe-rich phases in Mn ferrite films is confirmed from the Bragg’s peak splitting and the appearance of the patterned checkerboard-like domain in the surface. In the cross-sectional microstructure analysis, the distribution of Mn and Fe-signals alternately changes along the lateral (x and y) directions, while it is almost homogeneous in the z-direction. The result suggests that columnar-type phase separation occurs by the up-hill diffusion only along the in-plane directions. The propagation of a quasi-sinusoidal compositional wave in the lateral directions is confirmed from spatially resolved chemical composition analysis, which strongly demonstrates the occurrence of phase separation via SD. It is also found that the composition of Mn-rich and Fe-rich phases in phase-separated Mn ferrite thin films deposited at higher growth temperature and in situ magnetic field does not depend on the corresponding average film composition.

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Thin films of Co_1.7Fe_1.3O₄prepared by radio frequency sputtering – the first step towards their spinodal decomposition

Abstract: Co1.7Fe1.3O4 thin films are submitted to spinodal transformation after annealing at low temperature.

Cited by 12 publications

References 22 publications

Preparation of iron cobaltite thin films by RF magnetron sputtering

Preparation of iron cobaltite thin films by RF magnetron sputtering

Highly Sensitive Sputtered ZnO:Ga Thin Films Integrated by a Simple Stencil Mask Process on Microsensor Platforms for Sub-ppm Acetaldehyde Detection

Magnetic-field-induced phase separation via spinodal decomposition in epitaxial manganese ferrite thin films

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