Physics – Condensed Matter – Materials Science
Scientific paper
2011-03-19
J. Phys.: Conf. Ser. 200, 2010, 072101
Physics
Condensed Matter
Materials Science
4 pages, 3 figures
Scientific paper
10.1088/1742-6596/200/7/072101
We have studied the magnetic and power absorption properties of three samples of CoFe2O4 nanoparticles with sizes from 5 to 12 nm prepared by thermal decomposition of Fe (acac)3 and Co(acac)2 at high temperatures. The blocking temperatures TB estimated from magnetization M(T) curves spanned the range 180 < TB < 320 K, reflecting the large magnetocrystalline anisotropy of these nanoparticles. Accordingly, high coercive fields HC \approx 1.4 - 1.7 T were observed at low temperatures. Specific Power Absorption (SPA) experiments carried out in ac magnetic fields indicated that, besides particle volume, the effective magnetic anisotropy is a key parameter determining the absorption efficiency. SPA values as high as 98 W/g were obtained for nanoparticles with average size of \approx12 nm.
Goya Gerardo F.
Ibarra Aitor
Ibarra M. R.
Marquina C.
Morales Puerto M.
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