Seminaria

Seminarium wydziałowe on-line

Dnia 2022.11.08 (wtorek) o godzinie 13.15, odbędzie się seminarium online na którym dr Can Onur Avci z Institute of Materials Science of Barcelona (ICMAB-CSIC), Spain wygłosi wykład:

„Electrical manipulation and detection of magnetization in magnetic insulators”

Serdecznie zapraszamy

Andrzej Maziewski

Jerzy Przeszowski

Electrical manipulation and detection of magnetization in magnetic insulators Can Onur Avci Institute of Materials Science of Barcelona (ICMAB-CSIC), Carrer dels Til·lers s/n, 08193 Bellaterra, Spain E-mail: cavci@icmab.es

Spintronics, the concept of harnessing electron spin as an active variable in electronic circuits, has evolved into a broad and interdisciplinary research field at the intersection of physics, materials science, and nanotechnology. Our improved understanding of transport phenomena and magnetic interactions in solid-state, along with the discoveries of new materials and experimental techniques, enabled rapid progress in this exciting field. Current-induced control of magnetization lies at the heart of the research efforts as it will ultimately lead to highly efficient solid-state memory, logic, and signal transmission devices. These devices will boost the capabilities of the contemporary CMOS technologies and potentially offer beyond-CMOS concepts leading to paradigm shifts in the microelectronic industry [1].

In this talk, we will discuss current-induced magnetic manipulation and detection experiments in insulating magnetic systems mainly enabled by spin-orbit torques, spin Hall magnetoresistance, and other emerging spin transport phenomena. We will first present the fundamentals and symmetry of spin-orbit torques [2] and how they are used to switch magnetization in a magnetic insulator/platinum bilayers with high efficiencies [3]. We will then show how interfacial chiral magnetism stabilizes homochiral Neel domain walls in some perpendicularly magnetized iron garnets, which can be propelled as fast as 800 m/s with moderate current densities of the order of 108 A/cm2 [4]. In the last part of the talk, we will present a newly discovered spin transport phenomenon called thermal spin drag, which enables perpendicular magnetization detection in magnetic insulators in a nonlocal device geometry [5]. We will conclude by providing some future directions in spintronics that may benefit from the research progress in perpendicular ferromagnetic insulators.

[1] Dieny et al., Nat. Electron. 3, 446 (2020). [2] Garello, Avci, et al., Nat. Nanotech. 8, 587 (2013). [3] Avci et al., Nat. Mater. 16, 309 (2017). [4] Avci et al., Nat. Nanotech. 14, 561 (2019). [5] Avci et al., Phys. Rev. Lett. 127, 167202 (2021).