Zero-Field Nuclear Magnetic Resonance: A Complementary Technique to Study Magnetic Materials

Manjunatha, M and Ramesh, KP and Damle, R (2019) Zero-Field Nuclear Magnetic Resonance: A Complementary Technique to Study Magnetic Materials. In: National Conference on Advances in Spectroscopy: Molecules to Materials, NCASMM 2018, 4 - 6 October 2018, Ahmedabad, pp. 101-110.

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Abstract

We have built a versatile pulsed zero-field Nuclear Magnetic Resonance (NMR) spectrometer and used it to study the properties of ferromagnetic materials. Results obtained for 59Co nanoparticles show that the technique can be an effective alternative tool for the X-ray diffraction (XRD) measurements to study the phase composition of ferromagnetic nanoparticles. 57Fe NMR studies in nickel–cadmium ferrite show the robustness of the technique in determining the spinel state of the ferrimagnetic materials. The Fe3+ ions in inverse spinel ferrites allocate identically between two sites (octahedral B- and tetrahedral A-site) with the dissimilar internal field. Consequently, under the hypothesis that bivalent nickel enters B-sites, 57Fe NMR of trivalent iron ions yields two NMR signals of identical integral intensities corresponding to these sites. Successive replacement of bivalent Cd2+ cation modifies the structure from inverse spinal to normal spinel which results in the corresponding changes in the NMR signal. A detailed analysis of these changes can be used to estimate the site occupancy of the bivalent cation and its influence on the magnetic properties.

Item Type:	Conference Paper
Publication:	Springer Proceedings in Physics
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Springer.
Keywords:	Ferrimagnetic materials; Ferromagnetic materials; Ferromagnetism; Magnetic domains; Metal ions; Molecules; Nanoparticles; Nickel; Positive ions; Spectrometers, Bivalent cations; Cadmium ferrites; Complementary techniques; Ferromagnetic nanoparticles; Hyperfine field; Magnetic-domain state; Trivalent iron; Zero fields, Nuclear magnetic resonance
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	05 Dec 2022 06:36
Last Modified:	05 Dec 2022 06:36
URI:	https://eprints.iisc.ac.in/id/eprint/78229

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