2022 Fall Physics Colloquium Series

Dr. Alan Farhan, Department of Applied Physics, Aalto University School of Science, Aalto, Finland

Element sensitive spectroscopy and magnetometry on high-entropy oxide perovskite thin films

High-entropy oxide perovskites (HEOP) have recently been introduced as a potential prospect to design ferroic properties in oxide perovskites, both in the bulk [1] and thin film form [2,3], with La-based HEOPs attracting a major part of current research activities [1-3]. In this talk, I will present first results on the growth and characterization of new HEOP thin films that go beyond La-based perovskites. In particular, I will show how x-ray absorption spectroscopy, employing x-ray magnetic circular- and linear- dichroism (XMCD and XMLD), is an ideal tool to pick these ferroic layers apart on an element by element basis [4], allowing for prospects to further manipulate and enhance desired ferroic properties in modified HEOP thin films.

[1] R. Witte, A. Sarkar, R. Kruk, B. Eggert, R. A. Brand, H. Wende, and H. Hahn, Physical Review Materials 3, 034406 (2019).

[2] A. R. Mazza et al., Advanced Science 9, 2200391 (2022).

[3] Y. Sharma et al., Physical Review Materials 4, 014404 (2020).

[4] A. Farhan, F. Stramaglia, M. Cocconcelli, N. Kuznetsov, L. Yao, A. Kleibert, C. Piamonteze, and S. van Dijken, Physical Review B 106, L060404 (2022).

Our colloquium is on every Wednesday 4-5PM US central time. You can see the talk schedule at https://www.baylor.edu/physics/colloquia. The streaming will start a little before each colloquium talk starts.