Calibration of ac and dc magnetometers with a Dy2O3 standard
Chen, Du-Xing (Universitat Autònoma de Barcelona. Departament de Física)
Skumryev, Vassil (Universitat Autònoma de Barcelona. Departament de Física)
Bozzo, Bernat (Institut de Ciència de Materials de Barcelona)

Data:	2011
Resum:	The ac susceptibility and magnetization curves of a glued Dy2O3 powder sample are measured by an ac susceptometer and a dc superconducting quantum interference device magnetometer, both of which have been calibrated previously. It is shown that the magnetic moment of the paramagnetic sample as a function of field and temperature may be accurately expressed by a combination of the Curie-Weiss law and the Langevin function at T > 45 K with three adjusting parameters, so that the dc magnetization curves and the magnitude and phase of ac susceptibility at different values of dc bias field measured by any magnetometer can be calibrated by using Dy2O3 as a standard. The expressions are empirical and cannot be justified in the entire field and temperature range by existing theories of paramagnetism. Below 10 K, indication of approaching a possible phase transition is found. It is shown that pure Dy2O3 powder may be used as a primary standard, with susceptibility [13. 28(T + 17)]−1 emu/Oe/g at T > 50 K and H < 10 kOe, in consistency with the Curie-Weiss law and the quantum mechanical theory of paramagnetism.
Ajuts:	Ministerio de Ciencia e Innovación CSD2007-00041
Nota:	This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Materials ; Propietats magnètiques
Publicat a:	Review of scientific instruments, Vol. 82, Núm. 4 (April 2011) , p. 045112/1-045112/9, ISSN 0034-6748

DOI: 10.1063/1.3581224

9 p, 631.0 KB

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