Institute of Fundamental Technological Research
Polish Academy of Sciences

Staff

Paweł Sznajder, PhD

Department of Biosystems and Soft Matter (ZBiMM)
Division of Complex Fluids (PFPZ)
position: senior specialist
telephone: (+48) 22 826 12 81 ext.: 421
room: 322
e-mail:

Doctoral thesis
2019-12-09 Stan stacjonarny sedymentującej zawiesiny przy małej liczbie Reynoldsa i dużej liczbie Pecleta  (UW)
supervisor -- Prof. Bogdan Cichocki, PhD, UW
 

Recent publications
1.  Szczytko J., Vaupotic N., Madrak K., Sznajder P., Górecka E., Magnetic moment of a single metal nanoparticle determined from the Faraday effect, PHYSICAL REVIEW E, ISSN: 1539-3755, DOI: 10.1103/PhysRevE.87.033201, Vol.87, No.3, pp.033201-1-6, 2013

Abstract:
Optical properties of a composite material made of ferromagnetic metal nanoparticles embedded in a dielectric host are studied. We constructed an effective dielectric tensor of the composite material taking into account the orientational distribution of nanoparticle magnetic moments in external magnetic field. A nonlinear dependence of the optical rotation on magnetic field resulting from the reorientation of nanoparticles is demonstrated. The theoretical findings were applied to the magneto-optical experimental data of cobalt ferromagnetic nanoparticles embedded in a dielectric liquid host. The dependence of the Faraday rotation on Co-based ferromagnetic nanoparticles was measured as a function of the external magnetic field, varying the size of nanoparticles and the wavelength of light. The proposed approach enables quantitative determination of the magnetic moment and the plasma frequency of a single nanoparticle, and from this the size of the nonmagnetic shell of magnetic nanoparticles.

Affiliations:
Szczytko J. - other affiliation
Vaupotic N. - other affiliation
Madrak K. - other affiliation
Sznajder P. - other affiliation
Górecka E. - other affiliation
2.  Serafin K., Oracz J., Grzybowski M., Koperski M., Sznajder P., Zinkiewicz Ł., Wasylczyk P., Measurement of the mass of an object hanging from a spring-revisited, European Journal of Physics, ISSN: 0143-0807, DOI: 10.1088/0143-0807/33/1/011, Vol.33, pp.129-134, 2012

Abstract:
In an open competition, students were to determine the mass of a metal cylinder hanging on a spring inside a transparent enclosure. With the time for experiments limited to 24 h due to the unexpectedly large number of participants, a few surprisingly accurate results were submitted, the best of them differing by no more than 0.5% from the true value with a relative uncertainty of less than 1%.

Affiliations:
Serafin K. - other affiliation
Oracz J. - other affiliation
Grzybowski M. - other affiliation
Koperski M. - other affiliation
Sznajder P. - other affiliation
Zinkiewicz Ł. - other affiliation
Wasylczyk P. - other affiliation
3.  Sznajder P., Piętka B., Szczytko J., Łusakowski J., Bardyszewski W., Resonant plasmon response of a periodically modulated two-dimensional electron gas, ACTA PHYSICA POLONICA A, ISSN: 0587-4246, DOI: 10.12693/APhysPolA.122.1090, Vol.122, No.6, pp.1090-1092, 2012

Abstract:
We report the theoretical study of the optical response of a periodically modulated two-dimensional electron gas. The density of states is calculated within the first order of the perturbation theory and the effects of the short-range disorder are explained and discussed. We demonstrate that the magnetic field values corresponding to the characteristic narrowing of the density of states width are given by the zeros of the subsequent Laguerre polynomials. The observed increase of the density of states at the edges are interpreted as van Hove singularities. The broadening effects are shown to modify and smear out the observed effects with increasing temperature above 2 K. The plasmon dispersion relation is discussed in terms of the random phase approximation. Small changes in plasmon dispersion relation related to the periodic modulation were predicted.

Affiliations:
Sznajder P. - other affiliation
Piętka B. - other affiliation
Szczytko J. - other affiliation
Łusakowski J. - other affiliation
Bardyszewski W. - other affiliation

Patents
Filing No./Date
Filing Publication
Autors
Title
Protection Area, Applicant Name
Patent Number
Date of Grant
pdf
402159
2012-12-20
BUP 13/2014
2014-06-23
Szczytko J., Górecka E., Vaupotic N., Madrak K., Sznajder P., Osewski P., Turski H., Pociecha D.
Sposób wyznaczania wartości namagnesowania nanocząstek magnetycznych oraz urządzenie do wyznaczania wartości namagnesowania nanocząstek magnetycznych
PL, Uniwersytet Warszawski
222392
WUP 07/2016
2016-07-29

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