Probing the stability and magnetic properties of magnetosome chains in freeze-dried magnetotactic bacteria
Philipp Bender, Lourdes Marcano, Iñaki Orue, Diego Alba Venero, Dirk Honecker, Luis Fernández Barquín, Alicia Muela, M. Luisa Fdez-Gubieda
Abstract
. 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.
Topics & Concepts
MagnetosomeMagnetotactic bacteriaMagnetometerMagnetiteParticle (ecology)Magnetic nanoparticlesMagnetic fieldMaterials scienceMagnetic momentNanoparticleNeutron scatteringChemical physicsMagnetic particle inspectionDipoleChemistrySmall-angle neutron scatteringBiomagnetismScatteringCondensed matter physicsChain (unit)BacteriaMagnetic structureNuclear magnetic resonanceParamagnetismMagnetismCrystallographyMagnetic dipoleNanotechnologyRubredoxinMagnetizationMagnetic domainGeomagnetism and Paleomagnetism StudiesMagnetic and Electromagnetic EffectsCharacterization and Applications of Magnetic Nanoparticles