Antiferromagnetic spintronics: linear and nonlinear dynamics

Dr. Olena Gomonay
Johannes Gutenberg-Universität Mainz
Wednesday, November 15, 2023
3:00 pm
RH 142


The application of antiferromagnets as active spintronic elements is usually motivated by their fast internal dynamics in the THz range. On the other hand, antiferromagnets do not generate noticeable external fields, which makes detection and manipulation of the magnetic dynamics challenging. In this talk I will discuss different dynamical regimes predicted by theory and experimental observations of antiferromagnetic dynamics. In particular, I will discuss light-induced magnon generation in insulating antiferromagnets (hematite, NiO [1-3]) and nonlinear magnetic dynamics in Mn2Au [4]. I will discuss the mechanisms responsible for the magnetic dynamics: thermomagnetoelastic effect and parametric downconversion via magnetoelastic mechanism in NiO, and the Néel spin orbit torque in Mn2Au. These results show that nonlinear regimes in antiferromagnets are challenging but accessible, and they also suggest that magnetoelastic mechanisms could be used to generate and detect the nonlinear antiferromagnetic dynamics.


[1] D. Bossini, et al, Phys. Rev. Lett., 127, 077202 (2021)

[2] E. Rongione, et al, Nat Commun 14, 1818 (2023).

[3] A. Kanj, et al, Sci. Adv. 9, eadh1601 (2023) [4] Y. Behovits, et al, arXiv:2305.03368


Speaker link:

Ilya Krivorotov