Ferromagnetic Resonance Spectra of Magnetosome Chains From first Micromagnetic Principles

Abstract:

Magnetotactic bacteria show distinct ferromagnetic resonance (FMR) spectra due to the pronounced uniaxial anisotropy related to the magnetosome chain geometry. Simplified physical models are able to explain the key features of these FMR spectra in terms of effective shape anisotropy, but do not capture the details that are related to chain geometry as such. Here I will show what FMR modes can be expected for magnetosome chains, how these can be experimentally determined, and may be used for detecting fossil magnetosome chains in sediments.