Angular-dependent remanent magnetization curve for perpendicular magnetic recording media determined by precise polar-Kerr detection system

Hasegawa, D.; Saito, Shin; Itagaki, N.; Meguro, Sakae; Konishi, Yuya; Yanagisawa, Eiji; Akahane, Koichi; Takahashi, M.

doi:10.1016/j.jmmm.2008.08.058

Cited by 2 publications

(1 citation statement)

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“…The calibration phase consists in the individuation of the characteristic parameters of the remanent hysteresis loop of the probe. This hysteresis curve is the plot, as a function of the value of magnetic field applied and then switched off, of the remanence corresponding to the in-field minor hysteresis loop where the maximum magnetization corresponds to the actual value of the magnetic field applied and then switched off 39 40 41 42 . The parameters to be determined to calibrate the tip are the remanent saturation magnetic field H rs , tip and the remanent coercivity H rc , tip .…”

Section: Step I: Probe Calibrationmentioning

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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