Sergio O. Valenzuela

December 15, 11:00 CET

ICREA and Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Spain 

Sergio O. Valenzuela is an ICREA Prof. at the Catalan Institute of Nanoscience and Nanotechnology (ICN2). He leads the Physics and Engineering of Nanodevices group, which focuses on quantum transport, spintronics and thermoelectricity in quantum and topological materials.

Designer van der Waals Heterostructures for Spintronic Applications

The large variety of 2D materials and their co-integration in van der Waals heterostructures enable innovative device engineering. Their atomically thin and layered nature promotes the design of artificial quantum materials with atomically smooth interfaces and by means of proximity effects, which originate from short-range interactions [1]. This designer approach is compelling for spintronic devices, which typically harness their functionalities from thin layers of magnetic and non-magnetic materials and the interfaces between them [1,2]. In this talk, I will highlight recent advances in this rapidly evolving field. I will then introduce novel ways to investigate proximity phenomena using spin transport dynamics, as reflected in spin relaxation anisotropy [3] and charge to spin interconversion [4] experiments. I will further address the relevance of crystal symmetry and the emergence of unconventional charge to spin conversion components when crystal symmetries are broken [5]. Finally, I will discuss the role of material intermixing in the nature of the spin-orbit torques [6] and the inherent advantages of 2D van der Waals heterostructures to suppress intermixing and possibly enhance the torques [7].

[1] J. F. Sierra et al., Nature Nano. 16, 856-868 (2021)
[2] H. Yang, S O. Valenzuela et al., Nature 606, 663-673 (2022)
[3] L. A. Benítez et al., Nature Phys. 14, 303-308 (2018); APL Materials 7, 120701 (2019)
[4] L. A. Benítez et al., Nature Mater. 19, 170-175 (2020)
[5] L. Camosi et al., 2D Mater. 9, 035014 (2022)
[6] F. Bonell et al., Nano Lett. 20, 5893-5899 (2020)
[7] T. Guillet et al. (unpublished)

Attendee Information

Location: Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, 10117 Berlin

Online access: Zoom. Please display your full name and affiliation.

Registration: Click here to register for in-person attendance. Please note that registration is only required if you wish to attend in person and are not affiliated with PDI. After registering we will contact you so that you can be greeted at the entrance and guided to the seminar room.