Device and method to measure the complex permeability of thin fi

Details Device and method to measure the complex permeability of thin fi Device and method to measure the complex permeability of thin fi

1996-04-05

1998-04-28

Karlsen, Ernest

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324654, 324717, 324229, G01N 2772

Patent

active

057449724

ABSTRACT:
The device has a single strip having a first end, a second end, a length and a width. The first end of the strip is curved toward the second end of the strip to form a loop having a height. The length is approximately 10 mm, the width is approximately 5-8 mm, and the height is approximately 0.8-1.2 mm. The loop is preferably fabricated from copper. The loop is mounted directly to a test instrument such as a computer controlled impedance analyzer or network analyzer. The test instrument measures the inductance and resistance of the loop with no thin film sample placed therein, and then measures the inductance and resistance of the loop containing the sample under test. From these measurements, the device ultimately derives the permeability of the sample under test. The method for measuring the complex permeability of thin films at ultra-high frequencies includes the steps of recording the residual inductance and resistance for the loop empty; measuring the total inductance and resistance for the loop loaded with the sample under test; determining the change in resistance by subtracting the resistance of the loop without any sample from the resistance when the loop is loaded with the sample under test; determining the change in inductance by subtracting the inductance of the loop without any sample from the inductance when the loop is loaded with the sample under test; and calculating permeability.

REFERENCES:
patent: 2693574 (1954-11-01), Koppelmann
patent: 3226615 (1965-12-01), Nagel
patent: 3234461 (1966-02-01), Trent et al.
patent: 5091696 (1992-02-01), Koosen
patent: 5528142 (1996-06-01), Feickert
patent: 5559436 (1996-09-01), Matthews et al.
patent: 5583426 (1996-12-01), Tiefnig

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