The design and operation of an automated double-crank vibrating sample magnetometer
S R Hoon; S N M Willcock; S R Hoon; Dept. of Math. & Phys., Manchester Polytech., UK; S N M Willcock; Dept. of Math. & Phys., Manchester Polytech., UK
Журнал:
Journal of Physics E: Scientific Instruments
Дата:
1988-08-01
Аннотация:
The authors report the design, performance and automation of a low-noise sensitive vibrating sample magnetometer (VSM) employing a novel balanced crank vibration transducer. The coupling of the transducer to variable temperature cryostats within both a 1.2 T transverse field electromagnet and a 13 T axial field superconducting solenoid is also reported. The moment sensitivity V mod m(V A<sup>-1</sup> m<sup>-2</sup>) lay in the range 1<or approximately=V(x<sub>0</sub>) mod m<or approximately=7 where the sample-coil separation x<sub>0</sub> was typically 30 mm. The corresponding noise level, in effective A m<sup>2</sup>, lay in the range 10<sup>-8</sup><or approximately=m(x<sub>0</sub>)<or approximately=10<sup>-7</sup>. The noise was found to be primarily determined by field current ripple and the transmission of spurious vibration.
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