Volume 75, Number 4, August 2006
|Page(s)||618 - 623|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||12 July 2006|
Deviation from Bloch law in ferrite nanoparticles
Magnetism Laboratory, S. N. Bose National Centre for Basic Sciences Block JD, Sector III - Salt Lake, Kolkata 700 098, India
Corresponding author: email@example.com
Accepted: 27 June 2006
The temperature dependence of saturation magnetization of ferrite nanoparticles has been studied to investigate the applicability of Bloch spin-wave theory to the finite-size systems. law is valid above ~75 for the smallest ferrite particles obtained in this experiment having size of ~2.5. The region of validity of Bloch law increases at the lower-temperature end with the increase in particle size and interparticle interactions. The anomaly from the spin-wave theory has been observed with an upturn at low temperature, which can be explained by considering the quantization of spin-wave spectrum due to the finite size of the particles.
PACS: 75.30.Ds – Spin waves / 75.50.Gg – Ferrimagnetics / 75.50.Tt – Fine-particle systems; nanocrystalline materials
© EDP Sciences, 2006
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