Wydarzenia

Dnia 2025-05-27 o godzinie 13:15 w Sali 2011 Wydziału Fizyki UwB, mgr Bhawna Sharma z Katedry Fizyki Magnetyków, Wydziału Fizyki UwB wygłosi wykład pt:

„“Living” domain stuctures in ultrathin magnetic films”

Serdecznie zapraszamy

Andrzej Maziewski

Jerzy Przeszowski

„“Living” domain stuctures in ultrathin magnetic films”

Bhawna Sharma

Department of Physics of Magnetism, Faculty of Physics, University of Bialystok

Doctoral School of University of Bialystok

The phenomenon of "living" magnetic domains—dynamic and fluctuating domain structures—has gained significant interest in recent years, with reports in CoFeB [1], CoFeB/Ru [2], and Co/Os [3] ultrathin layers fabricated via sputtering. These intriguing domain states are believed to arise in ultrathin films characterized by low coercivity and reduced domain wall energy, conditions often facilitated by the presence of Dzyaloshinskii-Moriya interaction (DMI). Building on our recent investigations of Pt/(W,Re)/Co(dCo)/Pt films [4,5] with different cobalt thickness dCo, grown by molecular beam epitaxy on W and Re buffer layers, we explore the emergence of living domains in Co films near the critical thickness dCo where the system transitions from a superparamagnetic (SPM) to soft ferromagnetic state. In this talk, I will present preliminary results on the domain structure evolution in ultrathin Co films with varying dCo and Re buffer layer thicknesses (dRe), focusing on how domain behavior changes as the system approaches the SPM regime. These findings offer new insights into tuning magnetic textures at the nanoscale and highlight the role of interface engineering in stabilizing unconventional domain states.

This work is supported by Polish National Science Center in the frame of project M- ERA.NET 3 (2022/04/Y/ST5/00164).

References:

[1]. Zázvorka, et al., (2019). Thermal skyrmion diffusion used in a reshuffler device. Nature Nanotechnology, 14(7), 658–661. https://doi.org/10.1038/s41565-019-0436-8

[2]. Mansell, et al., (2022). Weakly pinned skyrmion liquid in a magnetic heterostructure. Physical Review B, 106(5). https://doi.org/10.1103/PhysRevB.106.054413

[3]. Tolley, et al., (2018). Room-temperature observation and current control of skyrmions in Pt/Co/Os/Pt thin films. Physical Review Materials, 2(4). https://doi.org/10.1103/PhysRevMaterials.2.044404

[4]. Kurant, et al., (2022). Magnetic ordering in epitaxial ultrathin Pt/W/Co/Pt layers. Journal of Magnetism and Magnetic Materials, 558(May), 169485. https://doi.org/10.1016/j.jmmm.2022.169485

[5]. Dhiman, et al., (2025). Evolution of static and dynamic magnetic properties of Re/Co/Pt and Pt/Co/Re trilayers with enhanced Dzyaloshinskii-Moriya interaction. Applied Surface Science, 679(June 2024). https://doi.org/10.1016/j.apsusc.2024.161151