Title: Dzyaloshinskii Moriya interaction across antiferromagnet / ferromagnet interface,
Abstract: The antiferromagnet (AFM) / ferromagnet (FM) interfaces are of central
importance in recently developed pure electric or ultrafast control of FM
spins, where the underlying mechanisms remain unresolved. Here we report the
direct observation of Dzyaloshinskii Moriya interaction (DMI) across the AFM/FM
interface of IrMn/CoFeB thin films. The interfacial DMI is quantitatively
measured from the asymmetric spin wave dispersion in the FM layer using
Brillouin light scattering. The DMI strength is enhanced by a factor of 7 with
increasing IrMn layer thickness in the range of 1- 7.5 nm. Our findings provide
deeper insight into the coupling at AFM/FM interface and may stimulate new
device concepts utilizing chiral spin textures such as magnetic skyrmions in
AFM/FM heterostructures.