Morphology and magnetic properties of ultrafine ZnFe2O4 particles |
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| Authors: | T Sato K Haneda M Seki T Iijima |
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| Institution: | (1) Tokyo Engineering University, 192 Hachioji, Tokyo, Japan;(2) Research Institute for Scientific Measurements, Tohoku University, 980 Sendai, Japan;(3) NTT Technology Transfer Corporation, Musashino, 180 Tokyo, Japan;(4) NTT Applied Electronics Laboratories, Musashino, 180 Tokyo, Japan |
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| Abstract: | Well-crystallized ultrafine ZnFe2O4 particles of several nanometers in size have been prepared by the coprecipitation method, and their particle morphology and magnetic properties, especially at low temperatures, examined. Room-temperature X-ray diffraction, transmission electron microscopy, magnetization measurements at various temperatures from 300 K to 4.2 K, and Mössbauer spectroscopy at various temperatures from 300 K to 4.2 K, and at 4.2 K with a longitudinal magnetic field of 16.4 kOe applied have been employed. The formation of short-range and long-range magnetic order in small ZnFe2O4 particles above and below approximately 30 K is discussed. Below 30 K, the appearance of spontaneous magnetization and its hysteretic property is confirmed for small ZnFe2O4 particles. |
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| Keywords: | 75 50 -y 76 80 +y 61 50 -f |
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