Abstract
Magnetic nanocomposites possess complex and nonuniform magnetic structure. As a result it is necessary to use different physical methods to describe their properties. In this work we have applied a combination of micro and macro approaches to understand more deeply magnetic properties of some cobalt- containing nanocomposites. Testing of magnetic structure of the samples at molecular level was done with NMR and Mossbauer techniques whereas static (SQUID) and dynamic magnetic (M2, see below) measurements - at macro level.
Highlights
Magnetic nanocomposites have aroused significant scientific and technological interest due to their unique properties and wide area of possible applications, see e.g. [1] and references within
A dependence of magnetization M against temperature was measured with a SQUID magnetometer in a constant magnetic field in a range 1 mT – 6 T when heating the sample preliminary cooled from 300 K down to 3 K in zero field or in the applied field
Small increasing of MFC(T) at cooling as well as large deviation of MFC(T) and MZFC(T) suggest a clustered state of the samples, including magnetically ordered noninteracting clusters in accordance with the known configuration of the samples consisting of metal nanoparticles placed on a surface of PTFE granules
Summary
Magnetic nanocomposites have aroused significant scientific and technological interest due to their unique properties and wide area of possible applications, see e.g. [1] and references within. Magnetic nanocomposites have aroused significant scientific and technological interest due to their unique properties and wide area of possible applications, see e.g. In systems with reduced dimensionality requires an application of as wide set of the techniques as possible. In our case we tested two magnetic nanomaterials, based on cobalt-containing clusters fixed on a surface of nanoTeflon (PTFE) granules. The first composite (further “Co”) contained cobalt clusters while the second composite (further “FeCo”) included those of bimetallic iron-cobalt clusters. To clarify magnetic state of the samples as a whole (bulk level) we employed measurements of static magnetization with SQUID magnetometry, and registration of the second harmonic of magnetization of longitudinal nonlinear response to a weak ac field (M2-response, see below). To test local magnetic state of cobalt and iron in the samples under study we used NMR and Mössbauer techniques
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
