Magnetic behavior of manganese doped aluminum iron oxide

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This paper reports the structural and magnetic properties of undoped and manganese doped aluminum iron oxide. The samples were prepared through a conventional solid-state reaction route using the planetary ball milling technique. The XRD profile showed a body centered tetragonal crystalline behavior in a perovskite structure. The field emission scanning electron microscopy images displayed segregated grain into different clusters. The significant magnetic loss tanδ is marked for the manganese doped aluminum iron oxide, which may dissipate as heat radiation and subsequently make it suitable in thermomagnetic devices for medical related research. The well-resolved peaks as observed in the absorption of the imaginary part of the magnetic modulus correspond to the spin resonance. The characteristic frequency is detected to shift rightward and signifying the lone presence of spin rotations in the high-frequency regime. The magnitude of the imaginary part of magnetic modulus increases with both the milling time and Mn content. This implies the more absorption of magnetic energy from the alternating magnetic field that in turn leading to decrease spin rotations and follows the decreasing trend in the grain size. The release of substantial amount of heat associated with the significant magnetic loss tanδ is noticed for the sample AFMO-3 h that mark it as a suitable candidate for thermotherapy in the low-frequency regime, which may be asserted as the novelty of this study. The semicircles in their Nyquist plots represent the single magnetic relaxation of the samples and thus, an equivalent circuit may be assumed consisting of inductance and resistance in series.