The design and operation of an automated double-crank vibrating sample magnetometer

Hoon, Steve R. and Willcock, S N M (1988) The design and operation of an automated double-crank vibrating sample magnetometer. Journal of physics e: scientific instruments, 21 (8). pp. 772-785. ISSN 0022-3735

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Abstract

We 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/m (V A-’ m-2) lay in the range 1sV(x0)lms7 where the sample-coil separation xo was typically 30 mm. The corresponding noise level, in effective A m2, lay in the range 10-8sm(xo)s10-’, The noise was found to be primarily determined by field current ripple and the transmission of spurious vibration.