The current limits in resolution are typically ~10-7 in pulsed magnetic fields, using the fiber Bragg grating method described below, and 10-8 in steady (DC) magnetic fields using capacitive dilatometers.
MS measurements in pulsed fields are carried out using a 125 µm Telecom single mode optical fiber, 9 µm core, furbished with a mm-long Bragg grating (FBG). The fiber is attached to the sample to detect length variations as the external magnetic field is applied. The reflection of light by the FBG at the Bragg wavelength shifts when the grating spacing changes. The change in wavelength is detected with a spectrometer furbished with a InGaAs line array camera operating at 47kHz (Jaime et al. Proc. Natl. Acad. Sci., 109, 12404 (2012)). Two different configurations can used to measure the MS. Longitudinal magnetostriction is measured with the fiber placed along the magnetic field direction, while transversal magnetostriction is measured when fiber is bent to sustain a 90 degree angle with the magnetic field.
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Last modified on 27 December 2022