Room-Temperature Topological Spin Textures for Next Generation Spintronics

Date

Nov 22, 2024

Time

10:30 AM - 11:30 AM

Speaker

Dr. Mehmet Cengiz Onbasli

Affiliation

Koc University

Language

en

Main Topic

Materialien

Host

Rita Taubert

Description

Topological spin textures like skyrmions and hopfions have emerged as promising candidates for low-power spintronic devices. However, stabilizing these textures at room temperature remains challenging. In this talk, we present the first observation of robust hopfion-skyrmion assemblies at room temperature and zero field in EuS-Bi2Se3-EuS trilayer heterostructures. Using Lorentz transmission electron microscopy, we directly visualize triangular skyrmion lattices encircled by hopfion rings. Polarized neutron reflectometry and SQUID magnetometry confirm room-temperature interfacial ferromagnetism. Micromagnetic modeling reveals that the interplay between Dzyaloshinskii-Moriya interactions, uniaxial anisotropy, and geometric confinement stabilizes these topological textures. We demonstrate that the skyrmion-hopfion assemblies can be tuned by varying the island size and magnetic field. Our results provide insight into the fundamental mechanisms governing topological spin textures at ferromagnet-topological insulator interfaces. The ability to create and manipulate room-temperature skyrmions and hopfions opens new avenues for topological spintronics, potentially enabling energy-efficient memory and logic devices. We will discuss the implications of our findings for developing practical spintronic applications based on topologically protected magnetic states.

Links

• Seminars at the IFW

Last modified: Nov 21, 2024, 7:40:28 AM