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Structural and magnetic properties of CoO-Pt core-shell nanoparticles
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SYSNO ASEP 0431708 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Structural and magnetic properties of CoO-Pt core-shell nanoparticles Author(s) Zeleňáková, A. (SK)
Zeleňák, V. (SK)
Michalik, Štefan (FZU-D)
Kováč, J. (SK)
Meisel, M. W. (US)Source Title Physical Review. B - ISSN 1098-0121
Roč. 89, č. 10 (2014), "104417-1"-"104417-10"Number of pages 10 s. Language eng - English Country US - United States Keywords CoO-Pt core shell nanoparticles ; superparamagnetism ; superspin glass state ; x-ray diffraction ; x-ray absorption spectroscopy Subject RIV BG - Nuclear, Atomic and Molecular Physics, Colliders Institutional support FZU-D - RVO:68378271 UT WOS 000333125100003 EID SCOPUS 84896984251 DOI 10.1103/PhysRevB.89.104417 Annotation Using microemulsion methods, CoO-Pt core-shell nanoparticles were synthesized and characterized by transmission electron microscopy, x-ray diffraction and x-ray absorption spectroscopy, which confirmed the existence of CoO cores and pure Pt surface layers. Using a magnetometer, the ac and dc magnetic properties were investigated over a range of temperature (2 K ≤T≤ 300 K), magnetic field (≤50 kOe), and frequency (≤1 kHz). The data suggest the presence of two different magnetic regimes whose onsets are identified at 6 K and 37 K, respectively. The magnetic behavior around 37 K indicates a superparamagnetic blocking of interacting nanoparticle moments. The behavior at 6 K characterizes a collective freezing of the nanoparticle moments in a superspin glass state. This co-existence of blocking and freezing behaviors is consistent with the presence of an antiferromagnetically ordered core and a magnetically disordered interlayer between the CoO core and the Pt shell. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2015
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