Abstract
The authors present a new approach of internal field 59Co NMR spectra assignment leaving apart from “usual” decomposition on “pure” hcp and fcc stackings, and a set of stacking faults (sfs) sf1–sf5 with a certain lines position. The authors propose including into consideration not only cobalt structural features as well as its magnetic nature due to the strong ferromagnetism in Co metal. The last fact supposes an existence of different magnetic species such as magnetic domains, domain walls, and single-domain particles, thereby helping to spectral lines assignment according to both structural and magnetic origin. The examined sample contains fcc and hcp resonance peaks in both domains and domain walls giving the hcp to fcc ratio equal to 1.9, as well a significant amount of Co sfs, or Co in loose coordination, up to 10 %. The research exhibits a good agreement of all implemented techniques.
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Acknowledgments
The authors thank Prof. V.I. Zaikovskii for provided HRTEM study. Also the authors thank for partial financial support grant RFBR # 14-03-31684 mol_a, # 13-03-00482 a, and # 15-53-15035, President Program of PhD students scholarships SP-389.2012.1, and the Ministry of Education and Science of the Russian Federation. Also A.S. Andreev thanks French Embassy (a scholarship within the joint postgraduate study).
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Andreev, A.S., Lapina, O.B. & Cherepanova, S.V. A New Insight into Cobalt Metal Powder Internal Field 59Co NMR Spectra. Appl Magn Reson 45, 1009–1017 (2014). https://doi.org/10.1007/s00723-014-0580-0
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DOI: https://doi.org/10.1007/s00723-014-0580-0