Detection of nonmagnetic metal thin film using magnetic force microscopy

Magnetic force microscopy (MFM) allows detection of stray magnetic fields around magnetic materials and the two-dimensional visualization of these fields. This paper presents a theoretical analysis of the oscillations of an MFM tip above a thin film of nonmagnetic metal. The results show good agreement with experimental data obtained by varying the tip height. The phenomenon analyzed here can be applied as a "metal detector" at the nanometer scale and for contactless measurement of sheet resistivity. The detection sensitivity is obtained as a function of oscillation frequency, thus allowing determination of the best frequency for phase-shift measurement. The shift in resonance frequency due to the presence of a nonmagnetic metal is also discussed.Comment: 4 pages, 5 figure

Measurement of the Lateral Charge Distribution in Silicon Generated by High-Energy Ion Incidence

The lateral distribution of the charge generated in silicon by a 15 MeV oxygen-ion incidence was experimentally measured. The lateral radius of the charge region generated because of this 15 MeV oxygen-ion incidence was 300-400 nm, which is much wider than that calculated using the well-known Katz theory. In addition, the measured peak concentration of the generated charge around the ion incident point was two orders of magnitude lower than that calculated using the Katz theory

Field Emission from Atomically Thin Edges of Reduced Graphene Oxide

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