Type: Article

The correlation of lattice constant with superexchange interaction in Bi-YIG fabricated by mechanochemical processing

Journal: Hyperfine Interactions (15729540)Year: June 2008Volume: 184Issue: Pages: 161 - 166

Niyaifar M. Ramani Radhakrishna M.C. Hassnpour A.Mozaffari M.^a Amighian J.

a :University of Isfahan - IRAN(IR) - Isfahan

DOI:10.1007/s10751-008-9783-9Language: English

Abstract

Magnetic and structural properties of Bi substituted YIG with nominal formula of Bi x Y3∈-∈x Fe5O 12 (x∈=∈0.0, 0.25, 0.5, 0.75, 1.00) prepared via Mechanochemical Processing (MCP) have been studied with Mossbauer spectroscopy, X-ray diffraction (XRD). The temperature dependence of sublattice magnetic hyperfine field for samples is analyzed. The a-d intersublattice superexchange found to be antiferromagnetic and increases from -∈21.97 to -∈25.79 kB as Bi increases from 0.0 to 0.25. The a-a and d-d intrasublattice exchanges for sample x∈=∈0.0 are 13.18 and 10.55 kB respectively while for sample x∈=∈0.25 a-a and d-d intrasublattice exchanges are 7.7 and 8.9 kB respectively. The correlation of lattice constant and superexchange interaction are discussed. © 2008 Springer Science+Business Media B.V.