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Issue 3, 2020
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Probing the stability and magnetic properties of magnetosome chains in freeze-dried magnetotactic bacteria

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Abstract

Magnetospirillum gryphiswaldense biosynthesize high-quality magnetite nanoparticles, called magnetosomes, and arrange them into a chain that behaves like a magnetic compass. Here we perform magnetometry and polarized small-angle neutron scattering (SANS) experiments on a powder of freeze-dried and immobilized M. gryphiswaldense. We confirm that the individual magnetosomes are single-domain nanoparticles and that an alignment of the particle moments along the magnetic field direction occurs exclusively by an internal, coherent rotation. Our magnetometry results of the bacteria powder indicate an absence of dipolar interactions between the particle chains and a dominant uniaxial magnetic anisotropy. Finally, we can verify by SANS that the chain structure within the immobilized, freeze-dried bacteria is preserved also after application of large magnetic fields up to 1 T.

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

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Article information


Submitted
11 Jul 2019
Accepted
26 Feb 2020
First published
27 Feb 2020

This article is Open Access

Nanoscale Adv., 2020,2, 1115-1121
Article type
Paper

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

P. Bender, L. Marcano, I. Orue, D. Alba Venero, D. Honecker, L. Fernández Barquín, A. Muela and M. L. Fdez-Gubieda, Nanoscale Adv., 2020, 2, 1115
DOI: 10.1039/C9NA00434C

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