SIMULTANEOUS MEASUREMENT OF THE RESISTIVITY AND PERMEABILITY OF A FILM SAMPLE WITH A DOUBLE COIL

Citation
Y. Nonaka et al., SIMULTANEOUS MEASUREMENT OF THE RESISTIVITY AND PERMEABILITY OF A FILM SAMPLE WITH A DOUBLE COIL, IEEE transactions on instrumentation and measurement, 44(3), 1995, pp. 679-682
Citations number
6
Categorie Soggetti
Engineering, Eletrical & Electronic","Instument & Instrumentation
ISSN journal
00189456
Volume
44
Issue
3
Year of publication
1995
Pages
679 - 682
Database
ISI
SICI code
0018-9456(1995)44:3<679:SMOTRA>2.0.ZU;2-Q
Abstract
A method is proposed for a simultaneous measurement of the resistivity and permeability of a film inserted between two coils facing each oth er, Connecting in series, the total impedance of the coils was measure d in two ways, i.e., 1) the current passes through the coils in the sa me direction, and 2) the current passes through each coil in opposite directions to each other, The resistivity and permeability of the film were simultaneously obtained from the difference in the impedance for the two cases, It was theoretically found that the optimum frequency for high accuracy in the measurement was proportional to the resistivi ty and inversely proportional to a thickness of a sample film. The res ults of the simultaneous measurements of the resistivity and permeabil ity of nickel films of a thickness ranging from 0.01-0.08 mm at a freq uency range of 1-100 kHz are shown in this paper, The measured values of the resistivity and permeability with this;method agreed with the v alues obtained by conventional methods, i.e., the dc four-probe method for the resistivity measurement and the toroidal coil method for the permeability measurement.