Partner: N. Nedelko

Institute of Physics, Polish Academy of Sciences (PL)

Ostatnie publikacje
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

Streszczenie:

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.

Słowa kluczowe:

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

Afiliacje autorów:

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.-Uniwersytet Warszawski (PL)
Wasik D.-Uniwersytet Warszawski (PL)
35p.
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

Streszczenie:

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.

Słowa kluczowe:

annealing, iron, magnetic properties, nanowires

Afiliacje autorów:

Krajewski M.-other affiliation
Lin W.S.-Tatung University (TW)
Lin H.M.-Tatung University (TW)
Tokarczyk M.-Uniwersytet Warszawski (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.-Uniwersytet Warszawski (PL)
Borysiuk J.-Uniwersytet Warszawski (PL)
Wasik D.-Uniwersytet Warszawski (PL)
25p.