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47 results on '"Temst, K."'

34. Surface roughness effects on the magnetization reversal of polycrystalline Fe/Ag thin films

Author

Swerts, J., Vandezande, S., Temst, K., and Van Haesendonck, C.

Subjects
*MAGNETIZATION, *MAGNETISM, *THIN films, *MAGNETIC properties
Abstract

Fe films with thickness varying from 46 to 1750 Å have been deposited on oxidized Si substrates coated with a Ag buffer layer. The surface morphology of both the Ag buffer layer and the Fe films was investigated by atomic force microscopy. Analysis of the images shows that the surface roughness of the Fe layers is completely dominated by the surface roughness of the Ag buffer layer. Magnetization measurements revealed that the magnetic properties of the Fe films are strongly affected by the surface roughness. The change in the coercivity as a function of the film thickness depends on the ratio of the film thickness and the typical size of the height variations of the surface. When this ratio is smaller than 1, the coercivity increases with increasing film thickness. For a ratio larger than 1, the coercivity decreases monotonically with the film thickness. [Copyright &y& Elsevier]

Published
2004
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42. Ternary silicide formation from Ni-Pt, Ni-Pd and Pt-Pd alloys on Si(100): Nucleation and solid solubility of the monosilicides.

Author

Schrauwen, A., Demeulemeester, J., Deduytsche, D., Devulder, W., Detavernier, C., Comrie, C.M., Temst, K., and Vantomme, A.

Subjects
*SOLID solutions, *TERNARY alloys, *SILICIDES, *NICKEL alloys, *SILICON, *NUCLEATION
Abstract

The solid solubility of the isomorphous monosilicides during the silicide reaction of Ni-Pt, Ni-Pd and Pt-Pd alloys on Si(100) is comparatively studied in the full composition range. Our study reveals that PtSi and PdSi, exhibiting a minor lattice mismatch, directly form a solid solution. In contrast, for larger differences in lattice parameters such as is the case for NiSi-PtSi and NiSi-PdSi, the mutually soluble phases coexist, prior to the formation of a solid solution at increased temperatures. Hence, it appears that the direct formation of a ternary monosilicide solid solution is inherently related to the lattice mismatch of the binary monosilicides. This finding provides an explanation for important differences observed in the elemental redistribution between the three systems, considered to be very similar up to now. Moreover, the different formation of a solid solution results in a fundamentally different nucleation of PdSi: while Ni lowers the nucleation barrier by reducing the contribution of the interface energy, Pt strongly increases the entropy of mixing which triggers the formation of the Pd-monosilicide at surprisingly low temperatures. Our results show that the lattice mismatch is a crucial parameter and determines the phase formation sequence and elemental redistribution during the silicide reaction. [ABSTRACT FROM AUTHOR]

Published
2017
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45. Influence of magnetocrystalline anisotropy on the magnetization reversal mechanism in exchange bias Co/CoO bilayers

Author

Demeter, J., Menéndez, E., Teichert, A., Steitz, R., Paramanik, D., Van Haesendonck, C., Vantomme, A., and Temst, K.

Subjects
*COBALT, *MAGNETIC properties of metals, *ANISOTROPY, *MAGNETIZATION, *FERROMAGNETISM, *CRYSTALLOGRAPHY, *MAGNETIC crystals, *CRYSTAL growth
Abstract

Abstract: We investigated the reversal mechanism in a Co/CoO exchange bias bilayer with a pronounced magnetocrystalline anisotropy in the ferromagnet. The anisotropy, which is induced by the growth of a highly textured Co layer, imposes a distinct reversal mechanism along the magnetically easy and hard direction. It is shown that exchange bias can be induced along both directions, despite the magnetocrystalline anisotropy. The interplay between the magnetocrystalline anisotropy and exchange bias induces a different reversal mechanism for the subsequent reversals in the two crystallographic directions. Along the hard axis, the magnetization reverses according to the reversal mechanism observed before in polycrystalline exchange bias bilayers, i.e. domain wall nucleation and motion for the first reversal and coherent rotation for the subsequent ones. Along the easy axis, domain wall motion remains the dominant reversal mechanism and magnetization rotation has only a minor contribution. [Copyright &y& Elsevier]

Published
2012
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46. Artificial neural networks for instantaneous analysis of real-time Rutherford backscattering spectra

Author

Demeulemeester, J., Smeets, D., Barradas, N.P., Vieira, A., Comrie, C.M., Temst, K., and Vantomme, A.

Subjects
*ARTIFICIAL neural networks, *BACKSCATTERING, *SPECTROMETRY, *SILICIDES, *ANNEALING of metals, *COMPUTER software
Abstract

Abstract: This paper reports on the advantage of using artificial neural networks (ANNs) to analyze large sets of real-time Rutherford backscattering spectrometry (RBS) data. Real-time RBS, i.e. collecting RBS spectra at periodic time intervals during a thermal treatment, probes the full response of a thin film to the annealing in situ. Although very valuable insights can be gained by this technique, the time-consuming analysis of the vast amount of RBS spectra acquired during real-time RBS measurements has so far prevented the widespread use of real-time RBS. Setting up an ANN is quite an intensive process as well, but once trained, these ANNs can handle the analysis of large data sets practically instantaneously. As such, the beneficial combination of real-time RBS and ANN analysis forms a perfect synergy. In this test case, a network was trained and applied to analyze the Ni silicide growth during annealing of a thin 80nm Ni film on Si(100). The ANN performance was validated by comparing the ANN results with the conventional analysis performed on the same data set. [Copyright &y& Elsevier]

Published
2010
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