Authors:
Y. Ichiyanagi Department of Physics, Graduate School of Engineering, Yokohama National University 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan

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T. Uehashi Department of Physics, Graduate School of Engineering, Yokohama National University 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan

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S. Yamada Department of Physics, Graduate School of Engineering, Yokohama National University 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan

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Y. Kanazawa Department of Physics, Faculty of Engineering 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan

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T. Yamada Department of Physics, Faculty of Engineering 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan

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Summary Ni1-xZnxFe2O4 (0≤x≤1) mixed ferrite nanoparticles encapsulated with amorphous-SiO2 were prepared by a wet chemical method. Particle sizes were controlled to range from 2.6 to 33.7 nm by heat treatment, and the particle size dependence of saturation magnetization Ms was investigated for the x=0.5 region. The Ms value decreased abruptly for particle sizes below about 6 nm. From the temperature dependence of the magnetization under field-cooled and zero-field-cooled conditions, blocking temperatures Tb were observed to be between 28 and 245 K depending on the particle size. At the blocking temperature, the superparamagnetic spins in the particle are supposed to be blocked against the thermal fluctuation energy. A smaller particle volume causes a lower blocking temperature; so an extremely small particle would be strongly affected by thermal fluctuation.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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