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\textit{Magnetospirillum gryphiswaldense} biosynthesize high qualitymagnetite nanoparticles, called magnetosomes, and arrange them into a chainthat behaves like a magnetic compass. Here we perform magnetometry andpolarized small-angle neutron scattering (SANS) experiments on a powder offreeze-dried and immobilized \textit{M. gryphiswaldense}. We confirm that theindividual nanoparticles are single-domain particles and that an alignment ofthe particle moments in field direction occurs exclusively by a N\'eel-likerotation. Our magnetometry results of the bacteria powder indicate an absenceof dipolar interactions between the particle chains and a dominant uniaxialmagnetic anisotropy. Finally, we can verify by SANS that the chain structurewithin the immobilized, freeze-dried bacteria is preserved also afterapplication of large magnetic fields of up to 1\,T.

Probing the stability and magnetic properties of magnetosome chains in freeze-dried magnetotactic bacteria