Open AccessImaging the Magnetization of Single Magnetite Nanoparticle Clusters via Photothermal Circular Dichroism
Author(s) -
Patrick Spaeth,
Subhasis Adhikari,
Kaveh Lahabi,
Martin D. Baaske,
Yonghui Wang,
Michel Orrit
Publication year - 2022
Publication title -
nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.853
H-Index - 488
eISSN - 1530-6992
pISSN - 1530-6984
DOI - 10.1021/acs.nanolett.2c00178
Subject(s) - magnetic circular dichroism , superparamagnetism , magnetic nanoparticles , materials science , photothermal therapy , microscopy , magnetite , magnetic force microscope , nanoparticle , magnetization , nuclear magnetic resonance , magnetic particle imaging , microscope , x ray magnetic circular dichroism , circular dichroism , nanotechnology , optics , chemistry , magnetic field , crystallography , physics , quantum mechanics , astronomy , metallurgy , spectral line
Magnetic imaging is a versatile tool in biological and condensed-matter physics. Existing magnetic imaging techniques either require demanding experimental conditions which restrict the range of their applications or lack the spatial resolution required for single-particle measurements. Here, we combine photothermal (PT) microscopy with magnetic circular dichroism (MCD) to develop a versatile magnetic imaging technique using visible light. Unlike most magnetic imaging techniques, photothermal magnetic circular dichroism (PT MCD) microscopy works particularly well for single nanoparticles immersed in liquids. As a proof of principle, we demonstrate magnetic CD imaging of superparamagnetic magnetite nanoparticulate clusters immersed in microscope immersion oil. The sensitivity of our method allowed us to probe the magnetization curve of single ∼400-nm-diameter magnetite nanoparticulate clusters.