Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 34: Functional Antiferromagnetism
MA 34.1: Vortrag
Donnerstag, 8. September 2022, 15:00–15:15, H48
Giant and tunneling magnetoresistance in unconventional compensated magnets with nonrelativistic d-wave spin-momentum couplings — Libor Šmejkal1,2, •Anna B. Hellenes1, Rafael González-Hernández3, Jairo Sinova1,2, and Tomaš Jungwirth2,4 — 1Johannes Gutenberg Universität Mainz, Germany — 2Czech Academy of Sciences, Prague, Czech Republic — 3Universidad del Norte, Barranquilla, Colombia — 4University of Nottingham, United Kingdom
The magnetoresistance effects used in commercial spintronics devices rely on spin current generated by the time-reversal broken band structure of ferromagnets. Realizing counterpart effects with all-antiferromagnetic electrodes has remained experimentally elusive, as conventional compensated antiferromagnets exhibit symmetries combining time-reversal with translation or inversion and thus prohibit nonrelativistic spin-polarized bands and spin currents. Recently, we have predicted large magnetoresistance effects in multilayers with an unconventional compensated magnetic phase[1]. It is characterized by zero magnetization and a time-reversal broken band structure[2], with d-wave spin-momentum coupling and alternating spin polarization [1,3] (thus also referred to as altermagnetism[3]). In the present contribution, we will describe mechanisms for giant and tunneling magnetoresistance relying on the anisotropic and valley-dependent forms of the d-wave spin-momentum coupling[1]. [1] L. Šmejkal, A. B. Hellenes et al., Phys. Rev. X 12, 011028, 2022. [2] L. Šmejkal et al., Sci. Adv. 6, eaaz8809, 2020. [3] L. Šmejkal et al., arXiv:2105.05820v2, 2021.