The insulating chiral magnet Cu
2OSeO
3 hosting topologically nontrivial spin order (Skyrmions and spin helices) is investigated via broadband microwave spectroscopy. We show that the spin helices exhibit linearly polarized magnetization dynamics at an unexpectedly small frequency of about 2 GHz. The two eigenmodes are cross-polarized, leading to linear dichroism in Cu
2OSeO
3. A Gilbert damping parameter of 1·10
-4 is measured for geometrically confined spin waves at 5 K. Using pulsed induced microwave magnetometry, we find that depending on the waveguide used, the relaxation time of the helix eigenmodes varies up to 30 times due to dephasing.
«
The insulating chiral magnet Cu
2OSeO
3 hosting topologically nontrivial spin order (Skyrmions and spin helices) is investigated via broadband microwave spectroscopy. We show that the spin helices exhibit linearly polarized magnetization dynamics at an unexpectedly small frequency of about 2 GHz. The two eigenmodes are cross-polarized, leading to linear dichroism in Cu
2OSeO
3. A Gilbert damping parameter of 1·10
-4 is measured for geometrically confined spin waves at 5 K. Using pulsed induced microw...
»