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MA: Fachverband Magnetismus

MA 21: Phd Focus Session: Altermagnets: Foundations and Experimental Evidence

Wednesday, March 20, 2024, 09:30–13:15, H 1058

Altermagnetism, a new type of collinear magnetism, is emerging as a platform to explore a wide array of physics and applications, from topology and superconductivity to dissipationless currents, ultrafast dynamics, efficient charge-to-spin conversion, and giant magnetoresistance. Altermagnets are magnetically compensated and collinear, with opposite magnetic moments residing on crystal-sublattices connected by rotation or mirror symmetries, which, notably, makes their spin symmetries mutually exclusive from collinear ferromagnets and antiferromagnets. Remarkably, as a consequence, particles such as electrons moving inside altermagnets can be strongly spin-polarized and spin-split, even though the magnetism overall compensates. The unconventional splitting sets altermagnets apart as intriguing spin-active material alternatives to conventional ferromagnets and materials with large spin-orbit coupling. In this session, we explore altermagnetism and its potential properties in various areas of solid-state physics by fostering discussion between communities and between young and experienced scientists. Starting from a pedagogical introduction to the field, we will uncover spectroscopic evidence of the spin-polarized electrons, magnetotransport, emerging phenomena in superconductor hybrid systems, and octupolar order, positioning altermagnetism as a new paradigm for addressing diverse applied and fundamental challenges in solid-state research.

Organizers: Anna Birk Hellenes (Johannes Gutenberg University Mainz), Alfred Dal Din (University of Nottingham), Marius Weber (Technical University Kaiserslautern-Landau), Bjørnulf Brekke (Norwegian University of Science and Technology), Miina Leiviskä (Czech Academy of Sciences)

	09:30	MA 21.1	Invited Talk: Altermagnets: An unconventional magnetic class — •Tomas Jungwirth
	10:00	MA 21.2	Invited Talk: Experimental evidence of time-reversal symmetry breaking in altermagnetic RuO2 — •O. Fedchenko, J. Minar, A. Akashdeep, S.W. D’Souza, D. Vasilyev, O. Tkach, L. Odenbreit, Y. Lytvynenko, Q. Nguyen, D. Kutnyakhov, N. Wind, L. Wenthaus, M. Scholz, K. Rossnagel, M. Hoesch, M. Aeschlimann, B. Stadtmüller, M. Kläui, G. Schönhense, T. Jungwirth, A. Birk Hellenes, G. Jakob, L. Šmejkal, J. Sinova, and H.-J. Elmers
	10:30	MA 21.3	Magneto-transport and magnetometry measurements in altermagnetic RuO2 — •Ruben Dario Gonzalez Betancourt, Teresa Tschirner, Philipp Kessler, Tommy Kotte, Dominik Kriegner, Bernd Büchner, Joseph Dufouleur, Libor Šmejkal, Jairo Sinova, Ralph Claessen, Tomas Jungwirth, Simon Moser, Helena Reichlová, and Louis Veyrat
	10:45	MA 21.4	Imaging the altermagnetic domain structure in MnTe — •Oliver Amin, Alfred Dal Din, Evangelos Golias, Yuran Niu, Alexei Zakharov, Sarnjeet Dhesi, Tomas Jungwirth, Kevin Edmonds, and Peter Wadley
	11:00	MA 21.5	Supercell Altermagnets — •Rodrigo Jaeschke-Ubiergo, Venkata Krishna Bharadwaj, Tomáš Jungwirth, Libor Šmejkal, and Jairo Sinova
	11:15	MA 21.6	Spontaneous formation of altermagnetism from orbital ordering — •Johannes Knolle, Valentin Leeb, Alexander Mook, and Libor Smejkal
	11:30		15 min. break
	11:45	MA 21.7	Invited Talk: Is my altermagnet ferromagneto-octupolar or ferromagneto-triakontadipolar (and does it matter)? — •Nicola Spaldin
	12:15	MA 21.8	Invited Talk: Negative critical current in an altermagnet Josephson junction — •Carlo Beenakker
	12:45	MA 21.9	Superconductor-altermagnet memory functionality without stray fields — •Hans Gløckner Giil and Jacob Linder
	13:00	MA 21.10	Dynamic paramagnon-polarons in altermagnets — •Charles Steward, Rafael Fernandes, and Joerg Schmalian