Spin dynamics in non-collinear ferrimagnets and antiferromagnets (hkk)

This joint theoretical and experimental project aims to understand the spin dynamics in non-collinear antiferromagnetic (AFM) and ferrimagnetic materials driven by the robust non-relativistic spin-transfer torque (in contrast to spin-orbit torque prevalent in AFM spintronics so far), taking into account lattice strains intimately linked to the magnetic structure via geometrically frustrated exchange interactions (underpinning the non-collinear structure). We will consider the magnetic domain structure (including its ties to local lattice defects and local strain distribution) in order to distinguish the effect of the conventional (in multidomain state) and unconventional torques (also in single domain state) on spin dynamics. To this end we will develop a non-collinear micromagnetic model with coupling of the magnetic degrees of freedom to local charge currents, local strains and temperature.