Pietro Gambardella,Department of Materials, ETH Zurich, CH - 8093 Zürich, Switzerland

Thursday, December 3 2PM (Paris time)

Switching, sensing, and coupling nanomagnets enabled by spin-orbit coupling

The spintronics landscape has changed dramatically over the last ten years. Much of this change is due to a deeper understanding of the interactions mediated by spin-orbit coupling in different classes of materials [1]. In this talk, I will discuss new opportunities to sense and manipulate the magnetization of metallic and insulating nanomagnets using the charge-spin conversion processes and asymmetric exchange interaction that originate from spin-orbit coupling in systems with broken inversion symmetry. Illustrative examples will focus on electrical switching of magnetic dots and magnetic tunnel junctions, domain wall displacements in iron garnets, as well as on the realization of synthetic topological textures and domain wall logic circuits.

[1] A. Manchon, J. Železný, I.M. Miron, T. Jungwirth, J. Sinova, A. Thiaville, K. Garello, and P. Gambardella, Rev. Mod. Phys. 91, 035004 (2019).

Figure 1. Synthetic chiral magnets comprising of out-of-plane and in-plane magnetized elements whose magnetization follows a unique sense of rotation. (A) Schematics of the chiral coupling mediated by the interfacial Dzyaloshinskii-Moriya interaction between adjacent out-of-plane and in-plane regions of a Pt/Co/AlOx trilayer. (B-F) Scanning electron micrographs and magnetic contrast images of coupled elements. (B,C) Lateral synthetic antiferromagnets. (D) Synthetic skyrmions. (E,F) Artificial spin systems consisting of Ising-like moments coupled via in-plane spacers in (E) a square lattice and (F) a kagome lattice recorded at zero field after saturation by an out-of-plane field. The scale bars are 500 nm. [From Luo et al., Science 363, 1435 (2019)].

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