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Your search keyword '"Mazalski, Piotr"' showing total 16 results
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16 results on '"Mazalski, Piotr"'

2. Influence of Ferromagnetic Interlayer Exchange Coupling on Current-induced Magnetization Switching and Dzyaloshinskii-Moriya Interaction in Co/Pt/Co Multilayer System

Author

Grochot, Krzysztof, Ogrodnik, Piotr, Mojsiejuk, Jakub, Mazalski, Piotr, Guzowska, Urszula, Skowroński, Witold, and Stobiecki, Tomasz

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

This paper investigates the relationship among interlayer exchange coupling (IEC), Dzyaloshinskii-Moriya interaction (DMI), and multilevel magnetization switching within a Co/Pt/Co heterostructure, where varying Pt thicknesses enable control over the coupling strength. Employing Brillouin Light Scattering to quantify the effective DMI, we explore its potential role in magnetization dynamics and multilevel magnetization switching. Experimental findings show four distinct resistance states under an external magnetic field and spin Hall effect related spin current. We explain this phenomenon based on the asymmetry between Pt/Co and Co/Pt interfaces and the interlayer coupling, which, in turn, influences DMI and subsequently impacts the magnetization dynamics. Numerical simulations, including macrospin, 1D domain wall, and simple spin wave models, further support the experimental observations of multilevel switching and help uncover the underlying mechanisms. Our proposed explanation, supported by magnetic domain observation using polar-magnetooptical Kerr microscopy, offers insights into both the spatial distribution of magnetization and its dynamics for different IECs, thereby shedding light on its interplay with DMI, which may lead to potential applications in storage devices.

Published
2022

4. Multilevel switching due to spin-orbit torques in Co/Pt/Co

Author

Grochot, Krzysztof, Ogrodnik, Piotr, Mojsiejuk, Jakub, Mazalski, Piotr, Skowroński, Witold, and Stobiecki, Tomasz

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), FOS: Physical sciences
Abstract

Spin-orbit torque current-induced magnetization switching provides an energy-efficient way of manipulating the magnetization in the ferromagnetic layers. Here, we present a detailed study of multilevel magnetization switching via spin-orbit torque in the Co/Pt/Co heterostructure with varied Pt thickness. Hence, the Pt layer plays the role of a spacer, providing the ability to control interlayer exchange coupling. As a result of the asymmetry between the top Pt/Co and bottom Co/Pt interfaces, and the coupling between the Co layers, four separate resistance states emerge when the external magnetic field is applied in the direction of the charge current. We reproduce the multilevel current switching mechanism using a numerical macro-spin model using the Landau-Lifshitz-Gilbert-Slonczewski equation. Finally, we propose an explanation of the accompanying multi-domain behavior, supported by measurements from polar-magnetooptical Kerr microscopy. Based on our findings, multilevel switching may have a potential application in energy-efficient high-density memory cells.

Published
2022
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5. A UHV MOKE magnetometer complementing XMCD-PEEM at the Elettra Synchrotron

Author

Genuzio, Francesca, Giela, Tomasz, Lucian, Matteo, Mentes, Tevfik Onur, Brondin, Carlo Alberto, Cautero, Giuseppe, Mazalski, Piotr, Bonetti, Stefano, Korecki, Jozef, Locatelli, Andrea, Genuzio, Francesca, Giela, Tomasz, Lucian, Matteo, Mentes, Tevfik Onur, Brondin, Carlo Alberto, Cautero, Giuseppe, Mazalski, Piotr, Bonetti, Stefano, Korecki, Jozef, and Locatelli, Andrea

Abstract

We report on a custom-built UHV-compatible Magneto-Optical Kerr Effect (MOKE) magnetometer for applications in surface and materials sciences, operating in tandem with the PhotoEmission Electron Microscope (PEEM) endstation at the Nanospectroscopy beamline of the Elettra synchrotron. The magnetometer features a liquid-nitrogen-cooled electromagnet that is fully compatible with UHV operation and produces magnetic fields up to about 140 mT at the sample. Longitudinal and polar MOKE measurement geometries are realized. The magneto-optical detection is based on polarization analysis using a photoelastic modulator. The sample manipulation system is fully compatible with that of the PEEM, making it possible to exchange samples with the beamline endstation, where complementary X-ray imaging and spectroscopy techniques are available. The magnetometer performance is illustrated by experiments on cobalt ultra-thin films, demonstrating close to monolayer sensitivity. The advantages of combining in situ growth, X-ray Magnetic Circular Dichroism imaging (XMCD-PEEM) and MOKE magnetometry into a versatile multitechnique facility are highlighted.

Published
2021
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11. Magnetization states and magnetization processes in nanostructures: From a single layer to multilayers (Phys. Status Solidi A 5∕2014)

Author

Maziewski, Andrzej, primary, Fassbender, Jürgen, additional, Kisielewski, Jan, additional, Kisielewski, Marek, additional, Kurant, Zbigniew, additional, Mazalski, Piotr, additional, Stobiecki, Feliks, additional, Stupakiewicz, Andrzej, additional, Sveklo, Iosif, additional, Tekielak, Maria, additional, Wawro, Andrzej, additional, and Zablotskii, Vitalii, additional

Published
2014
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14. Colloidal domain lithography for regularly arranged artificial magnetic out-of-plane monodomains in Au/Co/Au layers

Author

Kuświk, Piotr, primary, Ehresmann, Arno, additional, Tekielak, Maria, additional, Szymański, Bogdan, additional, Sveklo, Iosif, additional, Mazalski, Piotr, additional, Engel, Dieter, additional, Kisielewski, Jan, additional, Lengemann, Daniel, additional, Urbaniak, Maciej, additional, Schmidt, Christoph, additional, Maziewski, Andrzej, additional, and Stobiecki, Feliks, additional

Published
2011
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16. XAS and XMCD studies of magnetic properties modifications of Pt/Co/Au and Pt/Co/Pt trilayers induced by Ga+ ions irradiation.

Author

Mazalski, Piotr, Sveklo, Iosif, Kurant, Zbigniew, Ollefs, Katharina, Rogalev, Andrei, Wilhelm, Fabrice, Fassbender, Juergen, Baczewski, Lech Tomasz, Wawro, Andrzej, and Maziewski, Andrzej

Subjects
*MAGNETIC films, *PERPENDICULAR magnetic anisotropy, *X-ray absorption, *COMPUTER simulation, *ELECTRONIC structure
Abstract

Magnetic and magneto-optical properties of Pt/Co/Au and Pt/Co/Pt trilayers subjected to 30 keV Ga+ ion irradiation are compared. In two-dimensional maps of these properties as a function of cobalt thickness and ion fluence, two branches with perpendicular magnetic anisotropy (PMA) for Pt/Co/Pt trilayers are well distinguished. The replacement of the Pt capping layer with Au results in the two branches still being visible but the in-plane anisotropy for the low-fluence branch is suppressed whereas the high-fluence branch displays PMA. The X-ray absorption spectra and X-ray magnetic circular dichroism (XMCD) spectra are discussed and compared with non-irradiated reference samples. The changes of their shapes and peak amplitude, particularly for the high-fluence branch, are related to the modifications of the local environment of Co(Pt) atoms and the etching effects induced by ion irradiation. Additionally, in irradiated trilayers the XMCD measurements at the Pt L2,3-edge reveal an increase of the magnetic moment induced in Pt atoms. [ABSTRACT FROM AUTHOR]

Published
2015
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