Spin wave excitations in exchange biased IrMn/CoFe bilayers

Abstract

Using an atomistic spin model, we have simulated spin wave injection and propagation into antiferromagnetic IrMn from an exchange coupled CoFe layer. The spectral characteristics of the exited spin waves have a complex beating behavior arising from the non-collinear nature of the antiferromagnetic order. We find that the frequency response of the system depends strongly on the strength and frequency of oscillating field excitations. We also find that the strength of excited spin waves strongly decays away from the interfacial layer with a frequency dependent attenuation. Our findings suggest that spin waves generated by coupled ferromagnets are too weak to reverse IrMn in their entirety even with resonant excitation of a coupled ferromagnet. However, efficient spin wave injection into the antiferromagnet is possible due to the non-collinear nature of the IrMn spin ordering.

arXiv comment9 pages, 9 figures

References in corpus (8)

• Atomistic spin model simulations of magnetic nanomaterials
• Transformation of spin current by antiferromagnetic insulators
• Giant magnetic anisotropy of the bulk antiferromagnets IrMn and IrMn3
• Atomistic spin-model based on a new spin-cluster expansion technique: Application to the IrMn3/Co interface
• The Landau-Lifshitz equation in atomistic models
• Magnetic stray fields in nanoscale magnetic tunnel junctions
• Extraordinary temperature dependent magnetic anisotropy of the non-collinear antiferromagnet IrMn
• Phase Boundary Exchange Coupling in the Mixed Magnetic Phase Regime of a Pd-doped FeRh Epilayer

Cited by in corpus (2)

• The origin of exchange bias in multigranular non-collinear IrMn${}_3$/CoFe thin films
• Impact of gigahertz and terahertz transport regimes on spin propagation and conversion in the antiferromagnet IrMn