“…Their exposure to a magnetic eld from the outside is enormous and promising. Magnetic elds attract them, and they can retain their magnetic properties even when the external eld is removed [21]. Such a ferrite materials used in magnetic sensors, transformer cores, biomedical sensors, solar energy conversion, energy storage media, antenna rods, recording heads, microwave systems, magnetic cooling, ferro uids, drug delivery, cellular therapy, tissue repair, gas detectors , hyperthermia treatment, Nano-oil, oxygen-content-control, magnetic relaxation, strain energy can be used with spinel ferrite [22-30, 32, 34] [41].…”