Method of surface energy investigation by lateral AFM: application to control growth mechanism of nanostructured NiFe films

Zubar, T.I.; Fedosyuk, V. M.; Trukhanov, S. V.; Тишкевич, Д.И.; Michels, Dominik L.; Lyakhov, Dmitry; Труханов, А.В.

doi:10.1038/s41598-020-71416-w

Cited by 78 publications

(20 citation statements)

References 68 publications

(53 reference statements)

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“…Figure 1 c,d represents the SEM cross-sectional images of samples A and B; the corresponding thicknesses are ~3.02 and ~5.12 μm, respectively. AFM has proved to be a very useful and powerful technique for correctly determining the surface roughness, surface energy and morphology [ 30 , 31 ]. The surface morphology of samples A and B is observed by AFM in the 5 × 5 μm 2 region, as shown in Figure 1 e,f, and the values of root mean square (RMS) surface roughness of films are 2.32 and 2.36 nm, respectively.…”

Section: Resultsmentioning

confidence: 99%

Temperature Dependence of Stress and Optical Properties in AlN Films Grown by MOCVD

et al. 2021

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AlN epilayers were grown on a 2-inch [0001] conventional flat sapphire substrate (CSS) and a nano-patterned sapphire substrate (NPSS) by metalorganic chemical vapor deposition. In this work, the effect of the substrate template and temperature on stress and optical properties of AlN films has been studied by using Raman spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-visible spectrophotometer and spectroscopic ellipsometry (SE). The AlN on NPSS exhibits lower compressive stress and strain values. The biaxial stress decreases from 1.59 to 0.60 GPa for AlN on CSS and from 0.90 to 0.38 GPa for AlN on NPSS sample in the temperature range 80–300 K, which shows compressive stress. According to the TEM data, the stress varies from tensile on the interface to compressive on the surface. It can be deduced that the nano-holes provide more channels for stress relaxation. Nano-patterning leads to a lower degree of disorder and stress/strain relaxes by the formation of the nano-hole structure between the interface of AlN epilayers and the substrate. The low crystal disorder and defects in the AlN on NPSS is confirmed by the small Urbach energy values. The variation in bandgap (Eg) and optical constants (n, k) with temperature are discussed in detail. Nano-patterning leads to poor light transmission due to light scattering, coupling, and trapping in nano-holes.

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Section: Resultsmentioning

confidence: 99%

Temperature Dependence of Stress and Optical Properties in AlN Films Grown by MOCVD

et al. 2021

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“…As expected, the grain size decreased upon transition to pulse electrodeposition and the decrease in the pulse duration. While increasing the grain size is more energetically beneficial than the formation of a new growth nucleus, the coating grains grow continuously in stationary electrolysis [ 34 , 51 ]. The coating with a grain size of 500–600 nm was formed ( Figure 5 a) by stationary deposition.…”

Section: Resultsmentioning

confidence: 99%

Efficiency of Magnetostatic Protection Using Nanostructured Permalloy Shielding Coatings Depending on Their Microstructure

et al. 2021

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The effect of microstructure on the efficiency of shielding or shunting of the magnetic flux by permalloy shields was investigated in the present work. For this purpose, the FeNi shielding coatings with different grain structures were obtained using stationary and pulsed electrodeposition. The coatings’ composition, crystal structure, surface microstructure, magnetic domain structure, and shielding efficiency were studied. It has been shown that coatings with 0.2–0.6 µm grains have a disordered domain structure. Consequently, a higher value of the shielding efficiency was achieved, but the working range was too limited. The reason for this is probably the hindered movement of the domain boundaries. Samples with nanosized grains have an ordered two-domain magnetic structure with a permissible partial transition to a superparamagnetic state in regions with a grain size of less than 100 nm. The ordered magnetic structure, the small size of the domain, and the coexistence of ferromagnetic and superparamagnetic regions, although they reduce the maximum value of the shielding efficiency, significantly expand the working range in the nanostructured permalloy shielding coatings. As a result, a dependence between the grain and domain structure and the efficiency of magnetostatic shielding was found.

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“…Of particular interest is the design and fabrication of special nano-structured thin films, including magnetic layers, for the regulation of MOKE rotation inverse and the related reversal mechanism study. To date, various nanostructures, including periodic rectangular apertures [35], optical Tamm-state structures [36,37], and prism-coupled surface-plasmon-resonance systems [38,39], have been investigated to enhance sensing performance assisted by a variety of fabrication methods, such as electrochemical deposition [40,41] and magnetron sputtering [42].…”

Section: Introductionmentioning

confidence: 99%

Longitudinal Magneto-Optical Kerr Effect of Nanoporous CoFeB and W/CoFeB/W Thin Films

et al. 2022

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Nanoporous Co40Fe40B20 (CoFeB) and sandwich tungsten (W)/CoFeB/W thin films were fabricated via an anodic aluminum oxide (AAO) template-assisted magneto sputtering process. Their thickness-dependent magneto-optical Kerr effect (MOKE) hysteresis loops were investigated for enhanced Kerr rotation. Control of the Kerr null points of the polarized reflected light can be realized via the thicknesses of the CoFeB layers and W layers. Simulation of the thickness-dependent phase difference change by the finite element method reveals the existence of the two Kerr null points for W/CoFeB/W thin films, matching the experimental result very well. However, there are two additional Kerr null points for pure CoFeB thin films according to the simulation by comparing with the experimental result (only one). Theoretical analysis indicates that the different Kerr null points between the experimental result and the simulation are mainly due to the enhanced inner magnetization in the ferromagnetic CoFeB layer with the increased thickness, which is usually omitted in the simulation. Clearly, the introduction of non-ferromagnetic W layers can experimentally regulate the Kerr null points of ferromagnetic thin films. Moreover, construction of W/CoFeB/W sandwich thin films can greatly increase the highest magneto-optical susceptibility and the saturated Kerr rotation angle when compared with CoFeB thin films of the same thickness.

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Method of surface energy investigation by lateral AFM: application to control growth mechanism of nanostructured NiFe films

Cited by 78 publications

References 68 publications

Temperature Dependence of Stress and Optical Properties in AlN Films Grown by MOCVD

Temperature Dependence of Stress and Optical Properties in AlN Films Grown by MOCVD

Efficiency of Magnetostatic Protection Using Nanostructured Permalloy Shielding Coatings Depending on Their Microstructure

Longitudinal Magneto-Optical Kerr Effect of Nanoporous CoFeB and W/CoFeB/W Thin Films

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