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Magnetic study of co-doped magnetosome chains

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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Marcano L., Munoz D., Martín-Rodríguez R., Orue I., Alonso J., García-Prieto A., Serrano A., Valencia S., Abrudan R., Fernández Barquín L., García-Arribas A., Muela A., Fdez-Gubieda M.,

 Fuente: Journal of Physical Chemistry C, 2018, 122(13), 7541-7550

Editorial: American Chemical Society

 Fecha de publicación: 05/04/2018

Nº de páginas: 10

Tipo de publicación: Artículo de Revista

 DOI: 10.1021/acs.jpcc.8b01187

ISSN: 1932-7447,1932-7455

Proyecto español: MAT2014-55049- C2-R ; MAT2017-83631-C3-R

Autores/as

MARCANO PRIETO, LOURDES

MUÑOZ RODRÍGUEZ, DAVID

ORUE GOIKURIA, IÑAKI

GARCÍA PRIETO, ANA

SERRANO RUBIO, AIDA

VALENCIA MOLINA, SERGIO

ABRUDAN, RADU MARIUS

ALFREDO GARCIA ARRIBAS

MUELA BLÁZQUEZ, ALICIA

MARIA LUISA FERNANDEZ-GUBIEDA RUIZ