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Internal Magnetic Structure of Nanoparticles Dominates Time‐Dependent Relaxation Processes in a Magnetic Field
Author(s) -
Dennis Cindi L.,
Krycka Kathryn L.,
Borchers Julie A.,
Desautels Ryan D.,
van Lierop Johan,
Huls Natalie F.,
Jackson Andrew J.,
Gruettner Cordula,
Ivkov Robert
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201500405
Subject(s) - materials science , magnetic nanoparticles , nanoparticle , magnetic field , magnetic domain , condensed matter physics , context (archaeology) , nanotechnology , relaxation (psychology) , single domain , chemical physics , nuclear magnetic resonance , magnetization , physics , psychology , paleontology , social psychology , quantum mechanics , biology
Magnetic nanoparticles provide a unique combination of small size and responsiveness to magnetic fields making them attractive for applications in electronics, biology, and medicine. When exposed to alternating magnetic fields, magnetic nanoparticles can generate heat through loss power mechanisms that continue to challenge a complete physical description. The influence of internal nanoparticle (intracore) magnetic domain structure on relaxation remains unexplored. Within the context of potential biomedical applications, this study focuses on the dramatic differences observed among the specific loss power of three magnetic iron oxide nanoparticle constructs having comparable size and chemical composition. Analysis of polarization analyzed small angle neutron scattering data reveals unexpected and complex coupling among magnetic domains within the nanoparticle cores that influences their interactions with external magnetic fields. These results challenge the prevailing concepts in hyperthermia which limit consideration to size and shape of magnetic single domain nanoparticles.