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New Possibilities for Obtaining a Steep Nonlinear Current-Voltage Characteristics in some Semiconductor Structures

Autor: Sheka, D. I., Tretyak, O. V., Korol, A. M., Sen, A. K., Mookerjee, A.

Electronic processes in a semiconductor system consisting of some Resonant Tunnelling Structures, built in the depletion region of a Schottky barrier, are investigated. It is shown that the Schottky barrier can block or unblock the resonant tunnellin

Externí odkaz: http://arxiv.org/abs/0905.2142

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Effects of geometry on antiferromagnetic textures: boundaries and geometric curvature

Autor: Pylypovskyi, O., Borysenko, Y., Tomilo, A., Kononeko, D., Yershov, K., Roessler, U., Faßbender, J., Brink, J., Sheka, D., Makarov, D.

Publikováno v: APS March Meeting, 20.-22.03.2023, Online participation, USA

Geometric curvature in nanowires and shells is established as a powerful method to tailor chiral and anisotropic responses in ferromagnets. Here, we apply the framework of curvilinear magnetism to antiferromagnetic (AFM) systems. First, we consider c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______4577::2ab72035d2bd5f63097b6b5c5a264274
https://www.hzdr.de/publications/Publ-35992-1

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Magnetic field-induced textures and phase transitions in antiferromagnetic spin chains: geometry-induced effects

Autor: Borysenko, Y., Sheka, D., Yershov, K., Faßbender, J., Brink, J., Makarov, D., Pylypovskyi, O.

Publikováno v: WE-Heraeus-Seminar “Re-thinking Spintronics: From Unconventional Materials to Novel Technologies”, 03.-6.01.2023, Bad Honnef, Germany

Easy axis antiferromagnets (AFMs) are robust against external magnetic fields of a moderate strength. Spin reorientation transitions in strong fields can provide an insight into more subtle properties of antiferromagnetic materials, which are often h

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______4577::5c4f7aeab30bc0025804b1e0468b3353
https://www.hzdr.de/publications/Publ-36371-1

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Interaction of domain walls with grain boundaries in uniaxial insulating antiferromagnets

Autor: Pylypovskyi, O., Hedrich, N., Tomilo, A., Kosub, T., Wagner, K., Hübner, R., Shields, B., Sheka, D., Faßbender, J., Maletinsky, P., Makarov, D.

Publikováno v: Physical Review Applied 20(2023), 014020

A search for high-speed and low-energy memory devices puts antiferromagnetic thin films at the forefront of spintronic research. Here, we develop a material model of a granular antiferromagnetic thin film with uniaxial anisotropy and provide fundamen

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______4577::fbb3b44e67160c2dffaf47bdf70ed4d2
https://www.hzdr.de/publications/Publ-36982-1

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Surface magnetization of Cr2O3 (104) quantified via scanning NV magnetometry

Autor: Lehmann, P., Wagner, K., Pylypovskyi, O., Weber, S., Hedrich, N., Makushko, P., Shields, B., Kosub, T., Veremchuk, I., Sheka, D., Spaldin, N., Makarov, D., Maletinsky, P.

Publikováno v: WE-Heraeus-Seminar “Re-thinking Spintronics: From Unconventional Materials to Novel Technologies”, 03.-06.01.2023, Bad Honnef, Germany

Magneto-electric antiferromagnets are candidate materials for future spintronic devices. While antiferromagnets offer high speed, low power consumption and robustness to external fields, magneto-electrics allow manipulation of the magnetic order para

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______4577::5e4f5cf1cac70d67ac20a5f3684f29c5
https://www.hzdr.de/publications/Publ-36372-1

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Antiferromagnetic spin chains: ground states and phase transitions in static magnetic field of arbitrary direction

Autor: Borysenko, Y., Sheka, D., Yershov, K., Faßbender, J., Brink, J., Makarov, D., Pylypovskyi, O.

Publikováno v: AIM 2023 Advances in Magnetics, 15.-18.01.2023, Moena, Italy, 15.-18.01.2023, Moena, Italy

While easy axis antiferromagnets (AFMs) are robust against external magnetic fields of a moderate strength, spin reorientations in strong fields provide an insight into subtle properties of materials, which are usually hidden by the high symmetry of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______4577::22503e9e6f2a3d0f0395715a22a9b449
https://www.hzdr.de/publications/Publ-36331-1

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Interaction of antiferromagnetic domain walls with crystal defects

Autor: Pylypovskyi, O., Tomilo, A., Hedrich, N., Wagner, K., Shields, B. J., Kosub, T., Hübner, R., Faßbender, J., Sheka, D. D., Maletinsky, P., Makarov, D.

Publikováno v: DPG Meeting of the Condensed Matter Section: Magnetism Division, 26.-31.03.2023, Dresden, Germany

Understanding behavior of magnetic texture in antiferromagnetic nanostructures and thin films is crucial for the design of novel magnetic data storage and logic devices. Here, we derive the boundary conditions for the Néel vector in a two-sublattice

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______4577::63ac36b6c5a1927a82a0a7b1c1870448
https://www.hzdr.de/publications/Publ-36859-1

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Anisotropic effects in antiferromagnetic curvilinear spin chains

Autor: Pylypovskyi, O., Borysenko, Y., Kononenko, D. Y., Yershov, K. V., Roessler, U. K., Tomilo, A., Brink, J., Faßbender, J., Sheka, D. D., Makarov, D.

Publikováno v: DPG Meeting of the Condensed Matter Section: Magnetism Division, 26.-31.03.2023, Dresden, Germany

Curvilinear spin chains are simplest antiferromagnetic systems revealing direct influence of their shape onto magnetic states via geometry-tracking anisotropies stemming from the dipolar interaction [1] or local surrounding [2]. Here, we show that in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______4577::d26dd7cd3fa89825a1495d6ced844c4f
https://www.hzdr.de/publications/Publ-36860-1

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Nanoscale studies of antiferromagnetic spin-textures

Autor: Wagner, K., Lehmann, P., Pylypovskyi, O., Hedrich, N., Makushko, P., Shields, B., Kosub, T., Sheka, D., Makarov, D., Maletinsky, P.

Publikováno v: MMM 2022, 31.10.-4.11.2022, Minneapolis, USA

Magneto-electric antiferromagnets hold promise for future spintronic devices, as they offer magnetic field hardness, high switching speeds and both electric and magnetic control of their order parameters, owing to the magneto-electric coupling [1]. A

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______4577::d88d2df7a0aa113bc03ef8e15a49a283
https://www.hzdr.de/publications/Publ-36370-1

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Quantification of micromagnetic parameters in ultrathin asymmetrically sandwiched magnetic thin films

Autor: Volkov, O., Yastremsky, I. A., Pylypovskyi, O., Kronast, F., Abert, C., Oliveros Mata, E. S., Makushko, P., Mawass, M.-A., Kravchuk, V. P., Sheka, D. D., Ivanov, B. A., Faßbender, J., Makarov, D.

Publikováno v: The 67th Annual Conference on Magnetism and Magnetic Materials (MMM 2022), 31.10.-04.11.2022, Minneapolis, USA

Ultrathin asymmetrically sandwiched ferromagnetic films support fast moving chiral magnetic domain walls and skyrmions [1,2]. This paves the way to the realization of prospective racetrack memory concept, the performance of which is determined by the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______4577::0254afc03d74f01cc1fb7fc15bc0a615
https://www.hzdr.de/publications/Publ-35247-1

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