Broadband optical measurement of AC magnetic susceptibility of magnetite nanoparticles
Characterization of magnetic nanoparticles in solution is challenging due to the interplay between magnetic relaxation and agglomeration. The AC magnetic susceptibility of magnetite nanoparticles in water has been studied using magneto-optical methods in the frequency range of 10?Hz–250?kHz. The Faraday effect is detected simultaneously with changes in the fluid configuration. It is shown that the relative sensitivity to the magnetic and structural response can be adjusted by varying the wavelength, paving the way toward spatially resolved studies at the micro-scale.
The authors gratefully acknowledge the financial support of the UK Engineering and Physical Sciences Research Council (EPSRC) through Research Grant No. EP/P011403/1.
|Acceptance Date||Jan 28, 2020|
|Publication Date||Feb 10, 2020|
|Journal||Applied Physics Letters|
|Pages||062404 - 062404|
|Keywords||AC magnetic susceptibility, magnetite nanoparticles.|
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