Size-Dependent Relaxation Properties of Monodisperse Magnetite Nanoparticles Measured Over Seven Decades of Frequency by AC Susceptometry

Author

Ferguson, Richard Matthew ; Khandhar, A.P. ; Jonasson, Christian ; Blomgren, Jakob ; Johansson, Christer ; Krishnan, Kannan M.

Author_Institution

Dept. of Mater. Sci., Univ. of Washington, Seattle, WA, USA

Volume

49

Issue

7

fYear

2013

fDate

Jul-13

Firstpage

3441

Lastpage

3444

Abstract

Magnetic relaxation is exploited in innovative biomedical applications of magnetic particles such as magnetic particle imaging (MPI), magnetic fluid hyperthermia, and bio-sensing. Relaxation behavior should be optimized to achieve high performance imaging, efficient heating, and good SNR in bio-sensing. Using two AC susceptometers with overlapping frequency ranges, we have measured the relaxation behavior of a series of monodisperse magnetic particles and demonstrated that this approach is an effective way to probe particle relaxation characteristics from a few Hz to 10 MHz, the frequencies relevant for MPI, hyperthermia, and sensing.

Keywords

biosensors; heat treatment; hyperthermia; iron compounds; magnetic particles; magnetic relaxation; nanofabrication; nanomagnetics; nanoparticles; AC susceptometry; Fe₃O₄; MPI; biomedical application; biosensing; heating; hyperthermia; magnetic fluid hyperthermia; magnetic particle imaging; monodisperse magnetic particles; monodisperse magnetite nanoparticles; size-dependent magnetic relaxation properties; Atmospheric measurements; Magnetic cores; Magnetic resonance imaging; Magnetic susceptibility; Nanoparticles; Particle measurements; Size measurement; AC susceptometry; magnetic particle imaging; magnetic particles; magnetization reversal;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2239621

Filename

6559183