Department of Dielectrics

Head of group

Dr. hab. Wojciech Medycki, Prof. IFM PAN
phone: +48 61 86 95 180, room: 266
e-mail: wojciech.medycki@ifmpan.poznan.pl

The group

Prof. Dr. hab. Jan Jadżyn
phone: +48 61 86 95 167, room: 236
e-mail: jan.jadzyn@ifmpan.poznan.pl
Dr. Iwona Płowaś-Korus
phone: +48 61 86 95 272, room: 253
e-mail: iwona.plowas-korus@ifmpan.poznan.pl
Dr. Jolanta Świergiel
phone: +48 61 86 95 162, room: 228, 238
e-mail: jolanta.swiergiel@ifmpan.poznan.pl

A model system of tetramer molecules is studied. It is shown that changing the molecular anisotropy, α, one can obtain all Bravais lattices possible in 2D. The crystal structures of tetramers exhibit all known kinds of elastic behaviours, namely: auxetic, partially auxetic, and non-auxetic ones. A strongly auxetic behavior is found for tetramers with the anisotropy parameter α = 1.7

K.V. Tretiakov, K.W. Wojciechowski
Auxetic, Partially Auxetic, and Nonauxetic Behaviour in 2D Crystals of Hard Cyclic Tetramers
Physica Status Solidi-Rapid Research Letters 14, 2000198, 2020
The influence of the low concentrations and two different sizes of BaTiO₃ particles (nano- and submicroparticles) on the antiferroelectric liquid crystalline phase were investigated by complementary methods including dielectric spectroscopy, electro-optic measurements and X-ray diffraction.

S. Lalik, A. Deptuch, T. Jaworska-Gołąb, P. Fryń, D. Dardas, O. Stefańczyk, M. Urbańska, M. Marzec
Modification of AFLC Physical Properties by Doping with BaTiO₃ Particles
Journal of Physical Chemistry B, 124, 6055−6073, 2020
Frequency-dependent Fano factors for a large bias voltage: F_L(ω), F_R(ω) and F_LR(ω) (for auto- and cross- correlations) in 3 terminal setup with a proximized quantum dot; F_2t(ω) of N-QD-S system; F_L^N(ω) and F_LR^N(ω) of N-QD-N device.

G. Michałek, B.R. Bułka, T. Domański, K.I. Wysokiński
Statistical correlations of currents flowing through a proximized quantum dot
Physical Review B 101, 235402, 2020
Dabco - a metal–organic material - the complementary results of single-crystal X-ray diffraction, DSC, dielectric, NMR and Raman spectroscopy provide information about the phase transition, which results from the ordering of the DabcoH₂²⁺ molecules.

A. Cizman, D. Kowalska, M. Trzebiatowska, W. Medycki, M. Krupiński, P. Staniorowski, R. Poprawski
The structure and switchable dielectric properties of a dabco complex with chromium chloride
Dalton Transactions 49, 10394, 2020
a) Room temperature hysteresis loops (i1–i4) after zero field cooling (ZFC) processes; b) The initial magnetization curves after ZFC processes with appropriate annealing temperature (T_A). Inset represents the dependence of remanent magnetization vs. T_A, where points (i1–i4) correspond to hysteresis curves above.

P. Mazalski, B. Anastaziak, P. Kuświk, Z. Kurant, I. Sveklo, A. Maziewski
Demagnetization of an ultrathin Co/NiO bilayer with creation of submicrometer domains controlled by temperature-induced changes of magnetic anisotropy
Journal of Magnetism and Magnetic Mat. 508, 166871, 2020
Experimental and theoretical relative magnetoresistance, MR, and its components: spin Hall magnetoresistance (SMR) and anisotropic magnetoresistance (AMR), as a function of heavy metal’s thickness.

Ł. Karwacki, K. Grochot, S. Łazarski, W. Skowroński, J. Kanak, W. Powroźnik, J. Barnaś, F. Stobiecki, T. Stobiecki
Optimization of spin Hall magnetoresistance in heavy‑metal/ferromagnetic‑metal bilayers
Scientific Reports 10:10767, 2020
A novel AMX₄-type 0D molecular−ionic salt, (C₈H₂₀N)[BF₄] (1) exhibits the paraelastic-ferroelastic PT at 257/259 K (cooling/heating, I ↔ II). Temperature dependence of ¹H and ¹⁹F NMR second moment,M2, is shown.

M. Moskwa, E. Ganczar, P. Sobieszczyk, W. Medycki, P. Zieliński, R. Jakubas, G. Bator
Temperature-Stimulus Responsive Ferroelastic Molecular–Ionic Crystal: (C₈H₂₀N)[BF₄]
Journal of Physical Chemistry C 2020, 124, 18209−18218
Time dependent non-equilibrium transversal and longitudinal magnonic spin current components I^x_s(t) , I^y_s(t) and I^z_s(t) for a finite ferromagnetic sample. Longitudinal magnonic spin currents are important at short time scales, whereas in the long-time limit I^z_s(t) is dominant.

L. Chotorlishvili, Z. Toklikishvili, X.-G. Wang, V.K. Dugaev, J. Barnaś, J. Berakdar
Stratonovich-Ito integration scheme in ultrafast spin caloritronics
Physical Review B 102, 024413, 2020

INNOTECH - In-Tech
PIHe3
Polish-Swiss Research Programme
NANOSPIN
Programme Innovative Economy 2.2
SPINLAB

Institute of Molecular Physics
Polish Academy of Sciences

ul. Mariana Smoluchowskiego 17
60-179 Poznań, Poland

phone.: +48 61 86 95 100
fax: +48 61 86 84 524
e-mail: office@ifmpan.poznan.pl

NIP: 777-00-20-870

P. Mazalski, B. Anastaziak, P. Kuświk, Z. Kurant, I. Sveklo, A. Maziewski
Demagnetization of an ultrathin Co/NiO bilayer with creation of submicrometer domains controlled by temperature-induced changes of magnetic anisotropy
Journal of Magnetism and Magnetic Materials 508, 166871, 2020
A. Cizman, D. Kowalska, M. Trzebiatowska, W. Medycki, M. Krupiński, P. Staniorowski, R. Poprawski
The structure and switchable dielectric properties of a dabco complex with chromium chloride
Dalton Transactions 49, 10394, 2020
M. Moskwa, E. Ganczar, P. Sobieszczyk, W. Medycki, P. Zieliński, R. Jakubas, G. Bator
Temperature-Stimulus Responsive Ferroelastic Molecular–Ionic Crystal: (C₈H₂₀N)[BF₄]
Journal of Physical Chemistry C 2020, 124, 18209−18218
Ł. Karwacki, K. Grochot, S. Łazarski, W. Skowroński, J. Kanak, W. Powroźnik, J. Barnaś, F. Stobiecki, T. Stobiecki
Optimization of spin Hall magnetoresistance in heavy‑metal/ferromagnetic‑metal bilayers
Scientific Reports 10:10767, 2020
K.V. Tretiakov, K.W. Wojciechowski
Auxetic, Partially Auxetic, and Nonauxetic Behaviour in 2D Crystals of Hard Cyclic Tetramers
Physica Status Solidi-Rapid Research Letters 14, 2000198, 2020
L. Chotorlishvili, Z. Toklikishvili, X.-G. Wang, V.K. Dugaev, J. Barnaś, J. Berakdar
Stratonovich-Ito integration scheme in ultrafast spin caloritronics
Physical Review B 102, 024413, 2020
S. Lalik, A. Deptuch, T. Jaworska-Gołąb, P. Fryń, D. Dardas, O. Stefańczyk, M. Urbańska, M. Marzec
Modification of AFLC Physical Properties by Doping with BaTiO₃ Particles
Journal of Physical Chemistry B, 124, 6055−6073, 2020
K.P. Wójcik, I. Weymann, J. Kroha
Magnetic Kondo regimes in a frustrated half-filled trimer
Physical Review B 102, 045144, 2020
Ł. Lindner, M. Zdanowska-Frączek, Z. Czapla, Z. Frączek
A closer look at superionic phase transition in (NH₄)₄H₂(SeO₄)₃: impedance spectroscopy under pressure
Acta Crystallographica Section B-Structural Science Crystal Engineering and Materials B76, 1-7, 2020
G. Michałek, B.R. Bułka, T. Domański, K.I. Wysokiński
Statistical correlations of currents flowing through a proximized quantum dot
Physical Review B 101, 235402, 2020
J. Dubowik, P. Graczyk, A. Krysztofik, H. Głowiński, E. Coy, K. Załęski, I. Gościańska
Non-Negligible Imaginary Part of the Spin-Mixing Conductance and its Impacton Magnetization Dynamics in Heavy-Metal–Ferromagnet Bilayers
Physical Review Applied 13, 054011, 2020
S. Mieszczak, O. Busel, P. Gruszecki, A.N. Kuchko, J.W. Kłos, M. Krawczyk
Anomalous Refraction of Spin Waves as a Way to Guide Signals in Curved Magnonic Multimode Waveguides
Physical Review Applied 13, 054038, 2020

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