Superparamagnetism in the ZnFe_2O_4-NiFe_2O_4 System

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概要

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• The magnetic properties of the ZnFe_2O_4-NiFe_2O_4 system were examined at low temperatures by means of a Cioffi-type automatic fiuxmeter. It was found that 90Fe_2O_4-10NiFe_2O_4 shows superparamagnetic behavior above 20°K. By analyzing the superparamagnetic magnetization curves of this specimen, the size distribution of the superparaniagnetic clusters, as well as the temperature dependence of magnetization inside the cluster, were determined. The superparamagnetic cluster was found to be a ferrimagnetic ordered region separated magnetically from the matrix because all tetrahedral sites surrounding the cluster are occupied by nonmagnetic Zn^<2+> ions. It is suggested that the deviation of the saturation magnetic moment of this system from the theoretical value is not due to a canted alignment of spins, but due to the existence of paramagnetic and superparamagnetic spins in the crystal. This suggestion was confirmed by a M6ssbauer study carried out at room temperature for 60ZnFe_2O_4-40NiFe_2O_4.

• 社団法人日本物理学会の論文
• 1962-12-05

著者

• Ishikawa Yoshikazu

  The Institute For Solid State Physics The University Of Tokyo

• Ishikawa Yoshikazu

  The Institute Few Solid State Physics University Of Tokyo

• Ishikawa Y.

  The Institute few Solid State Physics, University of Tokyo

関連論文

• Motion of a Single Domain Wall in a Parasitic Ferromagnet YFeO_3
• Magnetic Properties of Ilmenite-Hematite System at Low Temperature
• Superparamagnetism in the ZnFe_2O_4-NiFe_2O_4 System
• Antiferromagnetism of γ Fe-Mn Alloys

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