Nulling loop configuration for an electrically insulating cantil

Details Nulling loop configuration for an electrically insulating cantil Nulling loop configuration for an electrically insulating cantil

1998-03-16

1999-11-02

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

324260, G01R 3302, G01R 2728

Patent

active

059777672

ABSTRACT:
A high sensitivity torque and force cantilever magnetometer has a cantilever with isolated capacitance detection and nulling circuits which provides increased sensitivity and accuracy to measurements of a magnetic moment of a sample placed on the cantilever and exposed to a magnetic field. Magnetic detection is by electrical capacitance between a metallized plate and the cantilever. The cantilever can be used to measure both isotropic and anisotropic magnetism. The cantilever is constructed of multiple layers of conducting and insulating materials to eliminate leakage current. The magnetometer measures the magnitude of a current through a null detection circuit having at least one nulling loop deposited on the cantilever required to maintain a constant capacitance between the cantilever and a metallized plate to determine the magnetization of the sample. The null detection circuit eliminates capacitance drift and improves the accuracy of the magnetometer. Nulling loop configurations for separately and accurately balancing force and torque terms generated by interaction between the nulling loops and the magnetic field on the cantilever further enhance the sensitivity of the cantilever.

REFERENCES:
patent: 5739686 (1998-04-01), Naughton et al.

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