Differential magnetic force microscope imaging

Wang, Ying; Wang, Zuobin; Liu, Jinyun; Hou, Liwei

doi:10.1002/sca.21186

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…where V dc is the tip-sample static bias and C ts is the tip-sample capacitance [37]. Therefore, modulation of the tipsample bias and of the tip-sample capacitance result in electrostatic artifacts in MFM images [38][39][40][41][42][43]. In our method, electrostatic artifacts are removed by acquiring two subsequent images of the same area, the first in standard MFM and the second in MFM after demagnetization of the tip.…”

Section: Resultsmentioning

confidence: 99%

Magnetic force microscopy characterization of cobalt nanoparticles: A preliminary study

Angeloni

Passeri

Schiavi

et al. 2020

AIP Conference Proceedings

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In order to characterize magnetic properties of cobalt-based nanoparticles synthesized through electrodeposition on metal substrates, methods must be employed which enable the imaging of sample surface, the selection of a specific nanoparticle, and the accurate evaluation of local magnetic parameters, such as magnetic moment or saturation magnetization. Due to the combination of imaging capability and quantitative probing of ultra-low magnetic field through the use of a nanometer sized tip with a magnetic coating, magnetic force microscopy (MFM) is a promising tool to characterize Co-based nanoparticles directly on substrates. In this work, the report the preliminary results of the use of MFM to analyze Co nanoparticles electrodeposited on an Al substrate. The aim wa to assess the effective capability of this technique to investigate this kind of nanomaterials, foresee offered possibilities, and highlight current limitations to overcome.

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Section: Resultsmentioning

confidence: 99%

Magnetic force microscopy characterization of cobalt nanoparticles: A preliminary study

Angeloni

Passeri

Schiavi

et al. 2020

AIP Conference Proceedings

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“…These observations along with earlier reports suggest that the origin of positive phase shifts in MFM images could be a combination of magnetic as well as non-magnetic interactions with the MFM probe. Further studies using approaches such as application of electric potentials to the MFM probe 47 or differential MFM imaging 50 may help resolve these contributions. It should also be noted that additional parameters like inter-particle dipole–dipole interactions 51 and heterogeneity in the chemical composition and size of the ferritin (iron) cores 52 could also be likely modulators of both negative and positive phase shifts in MFM.…”

Section: Discussionmentioning

confidence: 99%

Magnetic mapping of iron in rodent spleen

Blissett

Ollander

Penn

et al. 2017

Nanomedicine: Nanotechnology, Biology and Medicine

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Evaluation of iron distribution and density in biological tissues is important to understand the pathogenesis of a variety of diseases and the fate of exogenously administered iron-based carriers and contrast agents. Iron distribution in tissues is typically characterized via histochemical (Perl’s) stains or immunohistochemistry for ferritin, the major iron storage protein. A more accurate mapping of iron can be achieved via ultrastructural transmission electron microscopy (TEM) based techniques, which involve stringent sample preparation conditions. In this study, we elucidate the capability of magnetic force microscopy (MFM) as a label-free technique to map iron at the nanoscale level in rodent spleen tissue. We complemented and compared our MFM results with those obtained using Perl’s staining and TEM. Our results show how MFM mapping corresponded to sizes of iron-rich lysosomes at a resolution comparable to that of TEM. In addition MFM is compatible with tissue sections commonly prepared for routine histology.

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“…The same CM-MFM instrumentation can be also used to distinguish the electrostatic and magnetic signals in MFM images of relatively hard ferromagnetic samples, the stray field of which could orient the domains of the tip, thus reducing the effectiveness of the tip demagnetization procedure. Indeed, a magnetic field with intensity − H rs , tip can be applied and switched off after the first scan, following a procedure analogous to that used in SM-MFM 25 26 or in differential MFM 27 . A second MFM image is recorded with the probe magnetized along the opposite direction with respect to the first one ( Fig.…”

Section: Step Ii: Determination Of the Magnetic Signalmentioning

confidence: 99%

“…Differential MFM is an analogous method recently proposed by Wang et al . 27 , in which the two MFM images with reversed polarization are acquired subsequently to the topography with the tip maintained at a fixed distance (lift height) from the surface (lift mode). The applicability of these techniques for the evaluation of the electrostatic and magnetic signal is limited to hard ferromagnetic materials, having significant remanent magnetic moment and coercivity sufficiently high to ensure a constant magnetization of the sample even after the application of the external magnetic field necessary to invert the probe magnetization and under the magnetic stray field induced by the tip during the scan.…”

mentioning

confidence: 99%

Removal of electrostatic artifacts in magnetic force microscopy by controlled magnetization of the tip: application to superparamagnetic nanoparticles

Angeloni

Passeri

Reggente

et al. 2016

Sci Rep

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Magnetic force microscopy (MFM) has been demonstrated as valuable technique for the characterization of magnetic nanomaterials. To be analyzed by MFM techniques, nanomaterials are generally deposited on flat substrates, resulting in an additional contrast in MFM images due to unavoidable heterogeneous electrostatic tip-sample interactions, which cannot be easily distinguished from the magnetic one. In order to correctly interpret MFM data, a method to remove the electrostatic contributions from MFM images is needed. In this work, we propose a new MFM technique, called controlled magnetization MFM (CM-MFM), based on the in situ control of the probe magnetization state, which allows the evaluation and the elimination of electrostatic contribution in MFM images. The effectiveness of the technique is demonstrated through a challenging case study, i.e., the analysis of superparamagnetic nanoparticles in absence of applied external magnetic field. Our CM-MFM technique allowed us to acquire magnetic images depurated of the electrostatic contributions, which revealed that the magnetic field generated by the tip is sufficient to completely orient the superparamagnetic nanoparticles and that the magnetic tip-sample interaction is describable through simple models once the electrostatic artifacts are removed.

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Differential magnetic force microscope imaging

Cited by 9 publications

References 12 publications

Magnetic force microscopy characterization of cobalt nanoparticles: A preliminary study

Magnetic force microscopy characterization of cobalt nanoparticles: A preliminary study

Magnetic mapping of iron in rodent spleen

Removal of electrostatic artifacts in magnetic force microscopy by controlled magnetization of the tip: application to superparamagnetic nanoparticles

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