Study on magnetic properties of nanocrystalline La-, Nd-, or Gd-substituted Ni–Mn ferrite at low temperatures

• Published in: Journal of magnetism and magnetic materials Vol. 305; no. 1; pp. 91 - 94
• Main Authors: Zhao, Lijun, Yang, Hua, Yu, Lianxiang, Cui, Yuming, Zhao, Xuepping, Feng, Shouhua
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2006; Elsevier Science
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Diamagnetism, paramagnetism and superparamagnetism; Exact sciences and technology; Low temperature; Magnetic properties; Magnetic properties and materials; Magnetic properties of nanostructures; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Mössbauer effect; other γ-ray spectroscopy; Nanoparticles; Physics; Rare-earth ions; Spinel ferrite; Nanoparticles; Rare-earth ions; Spinel ferrite; Low temperature; Magnetic properties; Cubic lattices; Moessbauer effect; Magnetic moments; Magnetic hysteresis; Superparamagnetism; XRD; Ferrites spinels; Spin wave approximation; Nanocrystal
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2005.11.043

The effects of rare-earth ions with different radii and magnetic moments on the magnetic properties of Ni–Mn ferrite are investigated. X-ray diffraction pattern has shown the presence of cubic structure of spinel ferrite for all samples. The values of M s and H c are decreasing with increasing of testing temperatures for all samples. The H c value of Ni 0.7Mn 0.3La 0.1Fe 1.9O 4 reaches 1082 Oe at 2 K. Mössbauer spectra tested at 273 K indicate the presence of superparamagnetism for samples calcined at 873 K.