Nuclear Magnetic Resonance and Photomagnetic Phenomena in Oxygen-Deficient Ferric Borate.

Pleshakov, I. V.; Nechitaılov, A. A.; Paugurt, A. P.; Matveev, V. V.

Single crystals of ferric borate (FeBO3), annealed in vacuum so as to provide for the oxygen deficiency and the corresponding excess Fe2 ion concentration, have been studied by 57Fe NMR. The NMR signal intensity and the transverse nuclear relaxation rate in oxygen-deficient ferric borate are significantly increased compared to those in the initial state. The annealed samples also exhibit a giant shift of the resonance frequency under the action of light, which is several times as large as the analogous shift in samples with the equilibrium concentration of Fe2 ions. The obtained experimental data confirm the model of photomagnetic phenomena in antiferromagnetic materials that is based on the notion of Fe2 -containing complexes playing the role of photosensitive centers. © 2005 Pleiades Publishing, Inc.

BORATES; IRON; ANNEALING of metals; NUCLEAR magnetic resonance; PHOTOMAGNETIC effect; ANTIFERROMAGNETISM

Technical Physics Letters, 2005, Vol 31, Issue 12, p1049

1063-7850

Academic Journal

10.1134/1.2150895