Magnetization of Magnetically Inhomogeneous Sr2FeMoO6-δ Nanoparticles

Abstract

In this work, we describe the magnetization of nanosized SFMO particles with a narrow size distribution around ca. 70 nm fabricated by the citrate-gel technique. The single-phase composition and superstructure ordering degree were proved by X-ray diffraction, the superparamagnetic behavior by magnetization measurements using zero-field cooled and field-cooled protocols, as well as by electron magnetic resonance. Different contributions to the magnetic anisotropy constant and the temperature dependence of the magnetocrystalline anisotropy are discussed.

Nanogranular Strontium Ferromolybdate/Strontium Molybdate Ceramics—A Magnetic Material Possessing a Natural Core-Shell Structure

“…Thus, the b 1 /B term is effective only in a limited field range. If one only considers the term b 1 /B for nanogranular SFMO/SMO core-shell ceramics made by means of the citrate gel method [50], the m(B) characteristic is well approximated by b 1 = 0.05 T below 0.1 T, b 1 = 0.085 T in the region 0.3-1 T, and b 1 = 0.02 T in the region 1.5-4 T. On the other hand, the m(B) curve of a similar sample measured in a different setup [51] in this approach yields b 1 ≈ 0.3 T for magnetic fluxes in the range 2-10 T. The values given by the authors of [51] are b 1 = 0.968 T and b 2 = 0.00292 T 2 .…”

Strontium Ferromolybdate/Strontium Molybdate Core-Shell Ceramics—A Nanogranular Magnetic Material Possessing a Natural Core-Shell Structure

“…Thus, the b1/B term is effective only in a limited field range. If one only considers the term b1/B, for nanogranular SFMO/SMO core-shell ceramics made by means of the citrate gel method [37], the m(B) characteristics is well approximated by b1 = 0.05 T below 0.1 T, b1 = 0.085 T in the region 0.3-1 T and b1 = 0.02 T in the region 1.5 -4 T. On the other hand, the m(B) curve of a similar sample measured in a different setup [38] in this approach yields b1 ≈ 0.3 T for magnetic fluxes in the range 2-10 T. The values given by the authors of [38] are b1 = 0.968 T and b2 = 0.00292 T 2 .…”