Collective spin excitations of helices and magnetic skyrmions: review and perspectives of magnonics in non-centrosymmetric magnets

Abstract

Magnetic materials hosting correlated electrons play an important role for\ninformation technology and signal processing. The currently used ferro-, ferri-\nand antiferromagnetic materials provide microscopic moments (spins) that are\nmainly collinear. Recently more complex spin structures such as spin helices\nand cycloids have regained a lot of interest. The interest has been initiated\nby the discovery of the skyrmion lattice phase in non-centrosymmetric helical\nmagnets. In this review we address how spin helices and skyrmion lattices\nenrich the microwave characteristics of magnetic materials. When discussing\nperspectives for microwave electronics and magnonics we focus particularly on\ninsulating materials as they avoid eddy current losses, offer low spin-wave\ndamping, and might allow for electric field control of collective spin\nexcitations. Thereby, they further fuel the vision of magnonics operated at low\nenergy consumption.\n