Permeability measurement apparatus

Details Permeability measurement apparatus Permeability measurement apparatus

2008-02-28

2010-10-19

Shrivastav, Brij B (Department: 2831)

Electricity: measuring and testing

Particle precession resonance

Using an electron resonance spectrometer system

C324S319000

Reexamination Certificate

active

07816917

ABSTRACT:
A permeability measurement apparatus includes a magnetic field generation means applying an alternating magnetic field having a predetermined frequency to a magnetic substance to be measured; a probe needle placed in proximity or in contact to a microscopic area of the magnetic substance to be measured to which the alternating magnetic field is applied; a resonator including a coil wound on the probe needle, and generating a magnetic field having a resonant frequency higher than the frequency of the alternating magnetic field applied on the microscopic area having the probe needle in proximity or in contact thereto, and having an inductance of the coil varied as permeability in the microscopic area varies; and a measurement means measuring the permeability of the microscopic area of the magnetic substance to be measured based on the variation of the resonant frequency of the resonator according to the variation of the coil inductance.

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Makoto Endo, et al., “Scanning Nonlinear Magnetic Microscopy,” Extended Abstracts (The 66thAutumn Meeting, 2005); The Japanese Society of Applied Physics, No. 2, pp. 559, Sep. 5, 2005.

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