@article{10902/15837,
year = {2018},
month = {4},
url = {http://hdl.handle.net/10902/15837},
abstract = {Magnetotactic bacteria synthesize a chain of magnetic nanoparticles, called magnetosome chain, used to align and swim along the geomagnetic field lines. In particular, Magnetospirillum gryphiswaldense biomineralize magnetite, Fe3O4. Growing this species in a Co-supplemented medium, Co-doped magnetite is obtained, tailoring in this way the magnetic properties of the magnetosome chain. Combining structural and magnetic techniques such as transmission electron microscopy, energy-dispersive x-ray spectroscopy, X-ray absorption near edge structure, and X-ray magnetic circular dichroism, we determine that 1% of Co2+ substitutes Fe2+ located in octahedral places in the magnetite, thus increasing the coercive field. In the framework of the Stoner-Wohlfarth model, we have analyzed the evolution of the hysteresis loops as a function of temperature determining the different magnetic anisotropy contributions and their evolution with temperature. In contrast with the control magnetosome chains, whose effective anisotropy is uniaxial in the whole temperature range from 300 to 5 K, the effective anisotropy of Codoped magnetosome chains changes appreciably with temperature, from uniaxial down to 150 K, through biaxial down to 100 K, to triaxial below 100 K.},
organization = {L.M. acknowledges the Basque Government for her fellowship (PRE_2015_1_0130). We acknowledge the technical and human support provided by SGIker (UPV/EHU). Funding from the Spanish Government (project nos. MAT2014-55049-C2-R and MAT2017-83631-C3-R) and Basque Government (project n. IT711-13) is acknowledged. We thank the ESRF (CRG BM25 beamline-SpLine) and HZB for the allocation of synchrotron radiation beamtime and funding under the project CALIPSOplus (Grant Agreement 730872) from the EU
Framework Programme for Research and Innovation HORIZON 2020. We thank R. Fernández-Pacheco for his assistance in the EDS measurements.},
publisher = {American Chemical Society},
publisher = {Journal of Physical Chemistry C, 2018, 122(13), 7541-7550 - (CORRIGENDUM), 2022, 126(22), 9610},
title = {Magnetic study of co-doped magnetosome chains},
author = {Marcano Prieto, Lourdes and Muñoz Rodríguez, David and Martín Rodríguez, Rosa and Orue Goikuria, Iñaki and Alonso Masa, Javier and García Prieto, Ana and Serrano Rubio, Aida and Valencia Molina, Sergio and Abrudan, Radu Marius and Fernández Barquín, Luis and García Arribas, Alfredo and Muela Blázquez, Alicia and Fernández Gubieda, María Luisa},
}