We report on the magnetic field induced isothermal entropy change, Ds(Ha, T), of W-type ferrite with CoZn substitution. Entropy measurements are performed by direct calorimetry. Single crystals of the composition BaCo0.62Zn1.38Fe16O27, 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 K1=8.7e^4 Jm^-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
Direct calorimetric measurements of isothermal entropy change on single crystal W-type hexaferrite at the spin reorientation transition / Lobue, M.; Loyau, V.; Mazaleyrat, F.; Pasko, A.; Basso, Vittorio; Kuepferling, Michaela; Sasso, CARLO PAOLO. - In: JOURNAL OF APPLIED PHYSICS. - ISSN 0021-8979. - 111:7(2012), p. 07A905. [10.1063/1.3670062]
Direct calorimetric measurements of isothermal entropy change on single crystal W-type hexaferrite at the spin reorientation transition
BASSO, VITTORIO;KUEPFERLING, MICHAELA;SASSO, CARLO PAOLO
2012
Abstract
We report on the magnetic field induced isothermal entropy change, Ds(Ha, T), of W-type ferrite with CoZn substitution. Entropy measurements are performed by direct calorimetry. Single crystals of the composition BaCo0.62Zn1.38Fe16O27, 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 K1=8.7e^4 Jm^-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 KI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
