Abstract
This work deals with the effect that aluminum deposited on the strontium hexaferrite has on the magnetic and remanence properties. The aluminum was deposited using magnetron sputtering and the deposit thickness was varied through two deposition times. The presence of the aluminum was corroborated by X-ray diffraction and scanning electron microscopy. The magnetic characterization showed an increment in remanence squareness (Mr/Ms), while the maximum energy product (BHmax) exhibited a large increment regarding the hexaferrite without aluminum. Isothermal remanent magnetization (IRM) and direct current demagnetization (DCD) curves were measured for two samples with different amounts of deposited aluminum and for the strontium hexaferrite without aluminum. The Henkel plots and δM curves were discussed in the Stoner-Wohlfarth framework. Results show a diminishing of demagnetizing-like interactions as the deposited aluminum increases on the hexaferrite surface. This behavior suggests that aluminum promotes the emergence of a type of exchange interaction with a magnetizing effect.
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