Manipulating magnons via ultrafast magnetization modulation

N. Singh, P. Elliott, J. K. Dewhurst, S. Sharma

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We demonstrate how fundamental properties of magnons may be manipulated using femtosecond laser pulses by performing ab initio real-time time-dependent density functional theory simulations. To illustrate this, we show how the spin-wave dynamics in Fe50Ni50 can be manipulated in three different ways by tailoring the applied laser pulse to excite optically induced intersublattice transfer (OISTR): (1) element-selective destruction of magnon modes depending on the laser intensity, (2) delay-dependent freezing of the magnon mode into a transient noncollinear state (where the delay is in the pulse peak with respect to the start of simulations), and (3) OISTR-driven renormalization of the optical magnon frequency. Harnessing such processes would significantly speed up magnonic devices.

Original languageBritish English
Article number134402
JournalPhysical Review B
Volume103
Issue number13
DOIs
StatePublished - 1 Apr 2021

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