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

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