Calibration of low-temperature ac susceptometers with a copper cylinder standard
Chen, Du-Xing (Universitat Autònoma de Barcelona. Departament de Física)
Skumryev, Vassil (Universitat Autònoma de Barcelona. Departament de Física)

Fecha:	2010
Resumen:	A high-quality low-temperature ac susceptometer is calibrated by comparing the measured ac susceptibility of a copper cylinder with its eddy-current ac susceptibility accurately calculated. Different from conventional calibration techniques that compare the measured results with the known property of a standard sample at certain fixed temperature T, field amplitude Hm, and frequency f, to get a magnitude correction factor, here, the electromagnetic properties of the copper cylinder are unknown and are determined during the calibration of the ac susceptometer in the entire T, Hm, and f range. It is shown that the maximum magnitude error and the maximum phase error of the susceptometer are less than 0. 7% and 0. 3°, respectively, in the region T = 5-300 K and f = 111-1111 Hz at Hm = 800 A/m, after a magnitude correction by a constant factor as done in a conventional calibration. However, the magnitude and phase errors can reach 2% and 4. 3° at 10 000 and 11 Hz, respectively. Since the errors are reproducible, a large portion of them may be further corrected after a calibration, the procedure for which is given. Conceptual discussions concerning the error sources, comparison with other calibration methods, and applications of ac susceptibility techniques are presented.
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Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Calibratge ; Coure ; Materials ; Propietats magnètiques
Publicado en:	Review of scientific instruments, Vol. 81, Núm. 2 (Feb. 2010) , p. 025104/1-025104/10, ISSN 0034-6748

DOI: 10.1063/1.3309779

10 p, 380.8 KB

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