Issue |
Europhys. Lett.
Volume 75, Number 4, August 2006
|
|
---|---|---|
Page(s) | 618 - 623 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2006-10148-y | |
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: kalyan@bose.res.in
Received:
17
February
2006
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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