AC Magnetic Susceptibility Study of Fe and Co Based Nanoparticles

A. Zeleňákováa, J. Kováčb, V. Zeleňákc aInstitute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia bInstitute of Experimental Physics, Slovak Academy of Sciences, Watsonova 41, 041 54 Košice, Slovakia cInstitute of Chemistry, Faculty of Sciences, P.J. Šafárik University, Moyzesova 11, 041 54 Košice, Slovakia

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We have investigated magnetic properties of three different samples composed of magnetic Fe or Co core and protective Au or Pt metallic shell, namely Fe@Au, Co@Au and Fe@Pt samples, with sizes of about 10 nm, 8 nm and 5 nm respectively. We have measured and analysed the experimental data of real and imaginary component of ac susceptibility through theoretical laws for non-interacting and interacting particles and we have estimated the strength of their magnetic interactions. Our analyses showed the increase of inter-particle interactions with decreasing particles size.

DOI: 10.12693/APhysPolA.126.222 PACS numbers: 75.75.Fk, 81.05.Rm, 75.40.Cx