Regensburg 2022 – wissenschaftliches Programm

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SYSD: SKM Dissertation Prize 2022

SYSD 1: SKM Dissertation Prize

SYSD 1.3: Hauptvortrag

Montag, 5. September 2022, 11:15–11:45, H2

Probing magnetostatic and magnetotransport properties of the antiferromagnetic iron oxide hematite — •Andrew Ross — Johannes Gutenberg Universität-Mainz, Mainz, Germany

With spin dynamics in the THz regime, a lack of stray fields and a high stability in external magnetic fields, antiferromagnets have several benefits over ferromagnets for spintronics applications. In this talk I will discuss two key steps towards functionalising antiferromagnetic insulators, focussing on the antiferromagnetic iron oxide, hematite, the main component of rust.

First, I will demonstrate how spin Hall magnetoresistance measurements can be used to extract the strengths of key antiferromagnetic anisotropies for both bulk and thin film samples responsible for the equilibrium orientation of the magnetic ordering.

Then, I will show how we can use antiferromagnetic insulators for information transport via quantised magnetic excitations, magnons. Polarised magnons are electrically excited by an interfacial spin-bias and carried over micrometres by the antiferromagnetic Neel order, facilitated by the relative orientation of the antiferromagnetic Neel vector and the low damping of hematite. By performing direct magnetic imaging of the domain structure, the strong attenuation of the magnon transport by a multi-domain structure is elucidated. Overall, the results I will present demonstrate the feasibility and promise of the prototypical antiferromagnet hematite for antiferromagnetic spintronic devices.