Explosive Crystallization of Films of Amorphous Cobalt on a Sublayer of Carbon
E. N. Zubarev1, O. Yu. Devizenko1, V. V. Kondratenko1, D. V. Sevriukov1, V. A. Sevryukova1, O. S. Garbuz2, T. M. Sabov3, O. V. Dubikovskyi3, O. S. Oberemok3, V. P. Melnik3
1National Technical University ‘Kharkiv Polytechnic Institute’, 21 Kyrpychov Str., 61002 Kharkiv, Ukraine
2B.I. Verkin Institute for Low Temperature Physics and Engineering, NAS of Ukraine, 47 Nauky Ave., 61103 Kharkiv, Ukraine
3V. E. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 41 Nauky Ave., UA-03028 Kyiv, Ukraine
Received: 18.01.2018. Download: PDF
The mechanism of explosive crystallization of the amorphous cobalt films grown on an amorphous carbon by the DC-magnetron sputtering is studied by means of transmission electron microscopy, electron diffraction, small-angle X-ray diffraction, and secondary ion mass spectrometry. As established, the operating C-magnetron during both the deposition of the cobalt layer as well as the decrease in the cobalt-deposition rate result to an increase of the nominal thickness of the cobalt layer, tCo,nom, at which it is in an amorphous–cluster state with a small fraction of the nanocrystalline cobalt phase. An increase of the nominal thickness of cobalt to a boundary value of tbd≅ 5.0 nm leads to the appearance of both crystalline regions characterising the normal crystallization (stacking faults) and extensive regions with the zone axis [0001] characterising the explosive crystallization (without stacking faults). An increase in the nominal thickness of existence of an amorphous–cluster phase to a critical value of tcr≅ 6.0 nm is accompanied with cobalt crystallization by means of the mechanism of explosive crystallization, because of which a highly textured h.c.p.-Co lattice film with an [0001] axis perpendicular to the substrate is formed.
Key words: cobalt, amorphous–cluster state, explosive crystallization, transmission electron microscopy (TEM).
URL: http://mfint.imp.kiev.ua/en/abstract/v40/i03/0359.html
DOI: https://doi.org/10.15407/mfint.40.03.0359
PACS: 07.85.Fv, 61.05.cm, 61.05.J-, 68.37.Lp, 68.49.Sf, 81.15.Cd, 82.80.Ms
Citation: E. N. Zubarev, O. Yu. Devizenko, V. V. Kondratenko, D. V. Sevriukov, V. A. Sevryukova, O. S. Garbuz, T. M. Sabov, O. V. Dubikovskyi, O. S. Oberemok, and V. P. Melnik, Explosive Crystallization of Films of Amorphous Cobalt on a Sublayer of Carbon, Metallofiz. Noveishie Tekhnol., 40, No. 3: 359—379 (2018) (in Russian)