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Direct calorimetric measurements of isothermal entropy change on single crystal W-type hexaferrites at the spin reorientation transition

Authors :
Lobue, Martino
Loyau, Vincent
Mazaleyrat, Frédéric
Pasko, Alexander
Basso, Vittorio
Küpferling, Michaela
Sasso, Carlo Paolo
Source :
Journal of Applied Physics 111, 7 (2012) 07A905
Publication Year :
2012

Abstract

We report on the magnetic field induced isothermal entropy change, \Delta s(Ha, T), of W-type ferrite with CoZn substitution. Entropy measurements are performed by direct calorimetry. Single crystals of the composition BaCo$_0.62$Zn$_1.38$Fe$_16$O$_27$, prepared by the flux method, are measured at different fixed temperatures under an applied field perpendicular and parallel to the c axis. At 296 K one deduces a value of K$_1$ = 8.7 \times 10^{4} J m$^-3$ for the first anisotropy constant, which is in good agreement with the literature. The spin reorientation transition temperature is estimated to take place between 200 and 220 K.

Details

Database :
arXiv
Journal :
Journal of Applied Physics 111, 7 (2012) 07A905
Publication Type :
Report
Accession number :
edsarx.1210.0997
Document Type :
Working Paper
Full Text :
https://doi.org/10.1063/1.3670062