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N. Nedelko

Institute of Physics, Polish Academy of Sciences (PL)

Recent publications
1.  Krajewski M., Lin W.S., Lin H.M., Brzózka K., Lewińska S., Nedelko N., Ślawska-Waniewska A., Borysiuk J., Wasik D., Structural and magnetic properties of iron nanowires and iron nanoparticles fabricated through a reduction reaction, Beilstein Journal of Nanotechnology, ISSN: 2190-4286, DOI: 10.3762/bjnano.6.167, Vol.6, pp.1652-1660, 2015

Abstract:
The main goal of this work is to study the structural and magnetic properties of iron nanowires and iron nanoparticles, which have been fabricated in almost the same processes. The only difference in the synthesis is an application of an external magnetic field in order to form the iron nanowires. Both nanomaterials have been examined by means of transmission electron microscopy, energy dispersive X-ray spectrometry, X-ray diffractometry and Mössbauer spectrometry to determine their structures. Structural investigations confirm that obtained iron nanowires as well as nanoparticles reveal core–shell structures and they are composed of crystalline iron cores that are covered by amorphous or highly defected phases of iron and iron oxides. Magnetic properties have been measured using a vibrating sample magnetometer. The obtained values of coercivity, remanent magnetization, saturation magnetization as well as Curie temperature differ for both studied nanostructures. Higher values of magnetizations are observed for iron nanowires. At the same time, coercivity and Curie temperature are higher for iron nanoparticles.

Keywords:
iron nanoparticles, iron nanostructures, iron nanowires, magnetic properties, structural properties

Affiliations:
Krajewski M. - other affiliation
Lin W.S. - Tatung University (TW)
Lin H.M. - Tatung University (TW)
Brzózka K. - University of Technology and Humanities in Radom (PL)
Lewińska S. - Institute of Physics, Polish Academy of Sciences (PL)
Nedelko N. - Institute of Physics, Polish Academy of Sciences (PL)
Ślawska-Waniewska A. - other affiliation
Borysiuk J. - University of Warsaw (PL)
Wasik D. - University of Warsaw (PL)
2.  Krajewski M., Lin W.S., Lin H.M., Tokarczyk M., Lewińska S., Nedelko N., Ślawska-Waniewska A., Kowalski G., Borysiuk J., Wasik D., High temperature annealing of iron nanowires, PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, ISSN: 1862-6300, DOI: 10.1002/pssa.201431843, Vol.212, No.4, pp.862-866, 2015

Abstract:
This work presents the results of high temperature annealing of iron nanowires at five different temperatures (ranging 200–800 °C) in the slightly oxidative atmosphere. Investigated nanomaterial was prepared in simple chemical reduction process from aqueous solution of iron trichloride placed in external magnetic field. Experimental results allowed determining how magnetic properties of as-prepared as well as annealed iron nanowires change in respect to their structures. They also delivered information about phase transitions occurred in as-prepared sample under thermal treatment.

Keywords:
annealing, iron, magnetic properties, nanowires

Affiliations:
Krajewski M. - other affiliation
Lin W.S. - Tatung University (TW)
Lin H.M. - Tatung University (TW)
Tokarczyk M. - University of Warsaw (PL)
Lewińska S. - Institute of Physics, Polish Academy of Sciences (PL)
Nedelko N. - Institute of Physics, Polish Academy of Sciences (PL)
Ślawska-Waniewska A. - other affiliation
Kowalski G. - University of Warsaw (PL)
Borysiuk J. - University of Warsaw (PL)
Wasik D. - University of Warsaw (PL)

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