A new type of high sensitivity magnetic susceptometer is proposed. It utilises a long thin vibrating wire as a sample support, which is driven at resonance by an alternating field gradient, with no applied dc field. The gradient is generated by a tiny soft ferromagnetic rod close to the sample. The chosen configuration is particularly suitable to perform measurements on thin films and small samples in a wide temperature range (up to 1200 K). A realised prototype for high temperatures is described, with a few examples of measurements. An analysis of the moment sensitivity and considerations on the noise are given, with indications of the physical limits of the technique. A moment sensitivity of the order of 10^-11 Am2/(Hz)^(1/2), with an alternating field of 100 Nm, is estimated for the present prototype.
A wide temperature range susceptometer / Asti, G.; Solzi, Massimo. - In: IEEE TRANSACTIONS ON MAGNETICS. - ISSN 0018-9464. - 32:(1996), pp. 4893-4898. [10.1109/20.539280]
A wide temperature range susceptometer
SOLZI, Massimo
1996-01-01
Abstract
A new type of high sensitivity magnetic susceptometer is proposed. It utilises a long thin vibrating wire as a sample support, which is driven at resonance by an alternating field gradient, with no applied dc field. The gradient is generated by a tiny soft ferromagnetic rod close to the sample. The chosen configuration is particularly suitable to perform measurements on thin films and small samples in a wide temperature range (up to 1200 K). A realised prototype for high temperatures is described, with a few examples of measurements. An analysis of the moment sensitivity and considerations on the noise are given, with indications of the physical limits of the technique. A moment sensitivity of the order of 10^-11 Am2/(Hz)^(1/2), with an alternating field of 100 Nm, is estimated for the present prototype.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
