Maciej Kasprzak

Adam Mickiewicz University in Poznań

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Igor Iatsunskyi

Adam Mickiewicz University in Poznań

Karol Załęski

Adam Mickiewicz University in Poznań

Bartosz Kawczyński

Mateusz Kempiński

Adam Mickiewicz University in Poznań

Barbara Peplińska

Adam Mickiewicz University in Poznań

Jacek K. Wychowaniec

AO Foundation

Jagoda Litowczenko

Adam Mickiewicz University in Poznań

Marek Nowak

Dorota Flak

Adam Mickiewicz University in Poznań

Krzysztof Tadyszak

Czech Academy of Sciences, Institute of Macromolecular Chemistry

Cooperative Institutions

Adam Mickiewicz University in Poznań

RWTH Aachen University

Polish Academy of Sciences

Poznań University of Technology

Institut Català de Nanociència i Nanotecnologia

Centre National de la Recherche Scientifique

Bridge University

Institute of Physics

Max-Planck-Institut für Nachhaltige Materialien

Max Planck Society

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Elastic properties of fcc Fe–Mn–X (X = Cr, Co, Ni, Cu) alloys studied by the combinatorial thin film approach andab initiocalculations

Journal of Physics Condensed Matter (2013)

S. Reeh Maciej Kasprzak C D Klusmann F Stalf Denis Mušić

The elastic properties of fcc Fe-Mn-X (X = Cr, Co, Ni, Cu) alloys with additions of up to 8 at.% X were studied by combinatorial thin film growth and characterization and by ab initio calculations using the disordered local moments (DLM) approach. The lattice parameter and Young's modulus values change only marginally with X. The calculations and experiments are in good agreement. We demonstrate that the elastic properties of transition metal alloyed Fe-Mn can be predicted by the DLM model.

Lattice constant

Lattice (music)

10.1088/0953-8984/25/24/245401

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Citations (9)

Elastic Properties of Few Nanometers Thick Polycrystalline MoS₂ Membranes: A Nondestructive Study

Nano Letters (2017)

Bartłomiej Graczykowski Marianna Sledzinska Marcel Placidi David Saleta Reig Maciej Kasprzak

The performance gain-oriented nanostructurization has opened a new pathway for tuning mechanical features of solid matter vital for application and maintained performance. Simultaneously, the mechanical evaluation has been pushed down to dimensions way below 1 μm. To date, the most standard technique to study the mechanical properties of suspended 2D materials is based on nanoindentation experiments. In this work, by means of micro-Brillouin light scattering we determine the mechanical properties, that is, Young modulus and residual stress, of polycrystalline few nanometers thick MoS2 membranes in a simple, contact-less, nondestructive manner. The results show huge elastic softening compared to bulk MoS2, which is correlated with the sample morphology and the residual stress.

Nanometre

10.1021/acs.nanolett.7b03669

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Citations (30)

Wybrane obiekty kultury materialnej Wielkopolski a miejscowy surowiec skalny

Zeszyty Naukowe. Górnictwo / Politechnika Śląska (2005)

Maciej Kasprzak

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Elastic properties of face-centred cubic Fe–Mn–C studied by nanoindentation and ab initio calculations

Acta Materialia (2012)

S. Reeh Denis Mušić T. Gebhardt Maciej Kasprzak Tom Jäpel

Cubic crystal system

10.1016/j.actamat.2012.07.038

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Citations (46)

When Art Meets Science

Zenodo (CERN European Organization for Nuclear Research) (2019)

Krzysztof Tadyszak Olena Ivashchenko Barbara Peplińska Jagoda Litowczenko Igor Iatsunskyi

10.5281/zenodo.2533342

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Flux and storage of energy in nonequilibrium stationary states

Physical review. E (2019)

Robert Hołyst Anna Maciołek Yirui Zhang Marek Litniewski P. Knychała

Systems kept out of equilibrium in stationary states by an external source of energy store an energy $\Delta U=U-U_0$. $U_0$ is the internal energy at equilibrium state, obtained after the shutdown of energy input. We determine $\Delta U$ for two model systems: ideal gas and Lennard-Jones fluid. $\Delta U$ depends not only on the total energy flux, $J_U$, but also on the mode of energy transfer into the system. We use three different modes of energy transfer where: the energy flux per unit volume is (i) constant; (ii) proportional to the local temperature (iii) proportional to the local density. We show that $\Delta U /J_U=\tau$ is minimized in the stationary states formed in these systems, irrespective of the mode of energy transfer. $\tau$ is the characteristic time scale of energy outflow from the system immediately after the shutdown of energy flux. We prove that $\tau$ is minimized in stable states of the Rayleigh-Benard cell.

Stationary state

Energy flux

10.1103/physreve.99.042118

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Citations (16)

Microwave excitation of spin wave beams in thin ferromagnetic films

Scientific Reports (2016)

Paweł Gruszecki Maciej Kasprzak Andriy E. Serebryannikov Maciej Krawczyk Wojciech Śmigaj

An inherent element of research and applications in photonics is a beam of light. In magnonics, which is the magnetic counterpart of photonics, where spin waves are used instead of electromagnetic waves to transmit and process information, the lack of a beam source limits exploration. Here, we present an approach enabling generation of narrow spin wave beams in thin homogeneous nanosized ferromagnetic films by microwave current. We show that the desired beam-type behavior can be achieved with the aid of a properly designed coplanar waveguide transducer generating a nonuniform microwave magnetic field. We test this idea using micromagnetic simulations, confirming numerically that the resulting spin wave beams propagate over distances of several micrometers. The proposed approach requires neither inhomogeneity of the ferromagnetic film nor nonuniformity of the biasing magnetic field. It can be generalized to different magnetization configurations and yield multiple spin wave beams of different width at the same frequency.

Magnonics

Spin wave

Coplanar waveguide

Micromagnetics

Waveguide

10.1038/srep22367

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Citations (46)

High-temperature silicon thermal diode and switch

Nano Energy (2020)

Maciej Kasprzak Marianna Sledzinska Karol Załęski Igor Iatsunskyi F. Alzina

A thermal rectifier/diode is a nonreciprocal element or system that enables preferential heat transport in one direction. In this work we demonstrate a single-material thermal diode operating at high temperatures. The diode is made of nanostructured silicon membranes exhibiting spatially and temperature-dependent thermal conductivity and, therefore, falling into the category of spatially asymmetric, nonlinear nonreciprocal systems. We used an all-optical state-of-the-art experimental technique to prove rectification along rigorous criteria of the phenomenon. Using sub-milliwatt power we achieve rectification of about 14%. In addition, we demonstrate air-triggered thermal switching and passive cooling. Our findings provide a CMOS-compatible platform for heat rectification and applications in energy harvesting, thermal insulation and cooling, as well as sensing and potentially thermal logic.

Rectifier (neural networks)

10.1016/j.nanoen.2020.105261

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Citations (59)

Microstructures - photo album

Zenodo (CERN European Organization for Nuclear Research) (2018)

Krzysztof Tadyszak Olena Ivashchenko Barbara Peplińska Jagoda Litowczenko Igor Iatsunskyi

10.5281/zenodo.2533061

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Citations (2)