IFEG 20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Hf influence on the magnetic behavior of hematite nanoparticles
Autor/es:
P. G. BERCOFF; J. CARPENCO; C. HERME; S. E. JACOBO
Lugar:
Buenos Aires
Reunión:
Congreso; At the frontiers of Condensed Matter IV; 2008
Resumen:
The influence of NdCo substitution on the magnetic properties of
non-stoichiometric strontium hexaferrite nanoparticles
<!--
/* Font Definitions */
@font-face
{font-family:Batang;
panose-1:2 3 6 0 0 1 1 1 1 1;
mso-font-alt:"Arial Unicode MS";
mso-font-charset:129;
mso-generic-font-family:auto;
mso-font-format:other;
mso-font-pitch:fixed;
mso-font-signature:1 151388160 16 0 524288 0;}
@font-face
{font-family:"\@Batang";
panose-1:0 0 0 0 0 0 0 0 0 0;
mso-font-charset:129;
mso-generic-font-family:auto;
mso-font-format:other;
mso-font-pitch:fixed;
mso-font-signature:1 151388160 16 0 524288 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{mso-style-parent:"";
margin:0cm;
margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:12.0pt;
font-family:"Times New Roman";
mso-fareast-font-family:Batang;
mso-ansi-language:ES-AR;}
@page Section1
{size:595.3pt 841.9pt;
margin:99.25pt 3.0cm 70.9pt 3.0cm;
mso-header-margin:35.45pt;
mso-footer-margin:35.45pt;
mso-paper-source:0;}
div.Section1
{page:Section1;}
-->
In order to
study the influence of defects on the memory effect of hematite, Hf-doped
hematite was synthesized by the self-combustion method. The obtained
nanoparticles of 60 nm were characterized
by x ray diffraction (XRD) and magnetometry. Room temperature hysteresis loops
show a paramagnetic contribution that slightly increases with Hf content and a
very hard ferromagnetic contribution with coercivities which reach 6100 Oe for
the sample with higher Hf content. Magnetization vs temperature data indicate
that memory is enhanced while the Morin temperature is lowered with the doping,
even when the concentration of Hf is as low as 1%. The results are interpreted
in terms of the changes in the anisotropy introduced by the defects in the
lattice.
