Nanotechnology: Principles and Practices by Sulabha K. Kulkarni

Author:Sulabha K. Kulkarni
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

Using this technique, magnetization of a sample on application of magnetic field can be measured. Other sensitive technique is Superconducting Quantum Interference Device (SQUID), not discussed here. The instrument is based on the principle that an oscillatory magnetic field can be created by vibrating a magnetic sample. Magnetization in the sample is induced by applying a uniform magnetic field to the sample. The induced changes in the magnetic field are detected by a search coil. Applied magnetic field is usually quite large, but being constant is not detected by search coil. Generally the constant magnetic field is not really constant but slowly varied so that induced magnetization in the sample at different fields can be investigated. One can assume this slowly varying magnetic field as constant compared to vibrating field (Hz). Figure 7.50 gives the schematic diagram of a typical VSM. In most of the standard set ups a large electromagnet with 0 to 2.5 T field is used, although much higher magnetic field also can be provided. The pole pieces of the electromagnet are such that a large uniform magnetic field prevails for a sample, may be a thin film or powder sample held in a glass capillary attached to a special drive.

Fig. 7.50Schematic diagram of VSM

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