Design and validation of magnetic particle spectrometer for characterization of magnetic nanoparticle relaxation dynamics | Zendy

Nicolas Garraud | Zendy; Rohan Dhavalikar | Zendy; Lorena Maldonado-Camargo | Zendy; David P. Arnold | Zendy; Carlos Rinaldi | Zendy

Open Access

Design and validation of magnetic particle spectrometer for characterization of magnetic nanoparticle relaxation dynamics

Author(s) -

Nicolas Garraud,

Rohan Dhavalikar,

Lorena Maldonado-Camargo,

David P. Arnold,

Carlos Rinaldi

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4978003

Subject(s) - spectrometer , magnetic particle inspection , magnetic particle imaging , magnetic nanoparticles , nonlinear system , computational physics , materials science , harmonics , saturation (graph theory) , nuclear magnetic resonance , excitation , magnetization , amplitude , relaxation (psychology) , physics , analytical chemistry (journal) , nanoparticle , optics , magnetic field , nanotechnology , chemistry , psychology , social psychology , mathematics , quantum mechanics , voltage , combinatorics , chromatography

The design and validation of a magnetic particle spectrometer (MPS) system used to study the linear and nonlinear behavior of magnetic nanoparticle suspensions is presented. The MPS characterizes the suspension dynamic response, both due to relaxation and saturation effects, which depends on the magnetic particles and their environment. The system applies sinusoidal excitation magnetic fields varying in amplitude and frequency and can be configured for linear measurements (1 mT at up to 120 kHz) and nonlinear measurements (50 mT at up to 24 kHz). Time-resolved data acquisition at up to 4 MS/s combined with hardware and software-based signal processing allows for wide-band measurements up to 50 harmonics in nonlinear mode. By cross-calibrating the instrument with a known sample, the instantaneous sample magnetization can be quantitatively reconstructed. Validation of the two MPS modes are performed for iron oxide and cobalt ferrite suspensions, exhibiting Néel and Brownian relaxation, respectively.

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