Mössbauer Spectroscopy Study of the Superparamagnetism of Ultrasmall ϵ-Fe2O3 Nanoparticles

• Published in: JETP letters Vol. 108; no. 8; pp. 527 - 531
• Main Authors: Knyazev, Yu. V., Balaev, D. A., Kirillov, V. L., Bayukov, O. A., Mart’yanov, O. N.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.10.2018; Springer Nature B.V
• Subjects: Atomic; Biological and Medical Physics; Biophysics; Condensed Matter; Magnetic anisotropy; Magnetic moments; Molecular; Mossbauer spectroscopy; Nanoparticles; Optical and Plasma Physics; Particle and Nuclear Physics; Particle size; Particle size distribution; Physics; Physics and Astronomy; Quadrupoles; Quantum Information Technology; Silicon dioxide; Solid State Physics; Spectroscopic analysis; Spectrum analysis; Spintronics; Transmission electron microscopy

The superparamagnetism of an ensemble of ϵ-Fe 2 O 3 nanoparticles with a mean size of 3.9 nm dispersed in a xerogel SiO 2 matrix is studied by the Mössbauer spectroscopy method. It is shown that most nanoparticles at room temperature are in the superparamagnetic (unblocked) state. As the temperature...