Quantitative Measurement of the Magnetic Moment of Individual Magnetic Nanoparticles by Magnetic Force Microscopy

Sievers, S.; Braun, Kai-Felix; Eberbeck, Dietmar; Gustafsson, Stefan; Olsson, Eva; Schumacher, H. W.; Siegner, U.

doi:10.1002/smll.201200420

Cited by 78 publications

(86 citation statements)

References 15 publications

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“…Therefore, although in recent years MFM has been used to quantitatively study the magnetic properties of ferritin and nanometer sized MNPs, 29 , 39 , 41 , 42 in order to definitely assess the magnetic properties of magnetoferritin and other molecules at the nanoscale the value of m ct should be calibrated using a reference sample. Recently, an approach has been proposed in which such a calibration is performed for a fixed value of Δ z using MNPs with traceably determined magnetization dispersed on a Si surface as a MFM reference sample 30 . Following the approach illustrated in this work, using a suitable MFM reference sample to experimentally determine the parameters A and h ts would result in the calibration of m ct – relatively independently of the used values of lift height – and thus in the capability of MFM of quantitatively measuring the magnetic momentum of single MNPs with nanometrical lateral resolution.…”

Section: Resultsmentioning

confidence: 99%

“…As natural applications, MFM has been widely used in the study of magnetic recording media, 27 , 28 superconductors, and MNPs 29 , 30 . Limiting the discussion to the materials of interest in this paper, recently standard floppy disks have been used in the demonstration of a MFM based method for the indirect measurement of the thickness of soft organic and biological thin films which requires the use of substrates with periodic magnetic domains 31 .…”

Section: A Short Review Of Applicationsmentioning

confidence: 99%

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Magnetic force microscopy

et al. 2014

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Magnetic force microscopy (MFM) is an atomic force microscopy (AFM) based technique in which an AFM tip with a magnetic coating is used to probe local magnetic fields with the typical AFM spatial resolution, thus allowing one to acquire images reflecting the local magnetic properties of the samples at the nanoscale. Being a well established tool for the characterization of magnetic recording media, superconductors and magnetic nanomaterials, MFM is finding constantly increasing application in the study of magnetic properties of materials and systems of biological and biomedical interest. After reviewing these latter applications, three case studies are presented in which MFM is used to characterize: (i) magnetoferritin synthesized using apoferritin as molecular reactor; (ii) magnetic nanoparticles loaded niosomes to be used as nanocarriers for drug delivery; (iii) leukemic cells labeled using folic acid-coated core-shell superparamagnetic nanoparticles in order to exploit the presence of folate receptors on the cell membrane surface. In these examples, MFM data are quantitatively analyzed evidencing the limits of the simple analytical models currently used. Provided that suitable models are used to simulate the MFM response, MFM can be used to evaluate the magnetic momentum of the core of magnetoferritin, the iron entrapment efficiency in single vesicles, or the uptake of magnetic nanoparticles into cells.

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Section: Resultsmentioning

confidence: 99%

Section: A Short Review Of Applicationsmentioning

confidence: 99%

Magnetic force microscopy

et al. 2014

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“…Some methods have been published, which allow to extract the nanoparticle's magnetic moment from such MFM measurements [147]. Usually, the dipoledipole approximation is employed, i.e., the magnetic properties of both nanoparticle and MFM probe are approximated by simple magnetic dipoles m NP and m Probe , respectively, which interact at a certain probe-sample distance h. These measurements are currently extended to extract full distribution histograms of the nanoparticle magnetic moments (Fig.…”

Section: Applicationsmentioning

confidence: 99%

Imaging and Characterization of Magnetic Micro- and Nanostructures Using Force Microscopy

Block

2015

Surface Science Tools for Nanomaterials Characterization

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“…However, SQUID microscopy only provides the integral properties of ensembles of magnetic particles, whereas the magnetic characterization of individual particles is still inaccessible (16). MFM has a spatial resolution of better than 10 nm, but the direct extraction of quantitative information from MFM images is challenging (17).…”

Section: Xas-xmcdmentioning

confidence: 99%

Measuring spectroscopy and magnetism of extracted and intracellular magnetosomes using soft X-ray ptychography

Zhu

Hitchcock

Bazylinski

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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Characterizing the chemistry and magnetism of magnetotactic bacteria (MTB) is an important aspect of understanding the biomineralization mechanism and function of the chains of magnetosomes (Fe 3 O 4 nanoparticles) found in such species. Images and X-ray absorption spectra (XAS) of magnetosomes extracted from, and magnetosomes in, whole Magnetovibrio blakemorei strain MV-1 cells have been recorded using soft X-ray ptychography at the Fe 2p edge. A spatial resolution of 7 nm is demonstrated. Precursor-like and immature magnetosome phases in a whole MV-1 cell were visualized, and their Fe 2p spectra were measured. Based on these results, a model for the pathway of magnetosome biomineralization for MV-1 is proposed. Fe 2p X-ray magnetic circular dichroism (XMCD) spectra have been derived from ptychography image sequences recorded using left and right circular polarization. The shape of the XAS and XMCD signals in the ptychographic absorption spectra of both sample types is identical to the shape and signals measured with conventional bright-field scanning transmission X-ray microscope. A weaker and inverted XMCD signal was observed in the ptychographic phase spectra of the extracted magnetosomes. The XMCD ptychographic phase spectrum of the intracellular magnetosomes differed from the ptychographic phase spectrum of the extracted magnetosomes. These results demonstrate that spectro-ptychography offers a superior means of characterizing the chemical and magnetic properties of MTB at the individual magnetosome level.ptychography | magnetotactic bacteria | biomineralization | STXM |

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Quantitative Measurement of the Magnetic Moment of Individual Magnetic Nanoparticles by Magnetic Force Microscopy

Cited by 78 publications

References 15 publications

Magnetic force microscopy

Magnetic force microscopy

Imaging and Characterization of Magnetic Micro- and Nanostructures Using Force Microscopy

Measuring spectroscopy and magnetism of extracted and intracellular magnetosomes using soft X-ray ptychography

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