AC Magnetic-Field-Induced Heating and Physical Properties of Ferrite Nanoparticles for a Hyperthermia Agent in Medicine

Graphene oxide-Fe3O4 nanoparticle composite with high transverse proton relaxivity value for magnetic resonance imaging

“…5 One widely investigated potential material for MRI contrast agent application is superparamagnetic ferrite nanoparticles. 6 Ferrite nanoparticles are biocompatible; in addition to their application as MRI contrast agents, they are also being investigated for potential use in several other bio-medical fields, such as thermo responsive drug carrier, 7 targeted drug delivery, 8 hyperthermia for cancer treatment, 9 etc. Resovist and Feridex are two ferrite-based MRI contrast agents that have already been approved for clinical usage.…”

Cation distribution study of nanocrystalline NiFe2−xCrxO4ferrite by XRD, magnetization and Mössbauer spectroscopy

“…Ferrites still continue to be an intense area of research mainly due to their versatility in finding a large number of applications over a wide frequency range due to their low cost and high electromagnetic performance 1. Ferrites can be used for various applications such as humidity sensors 2, microwave devices 3, power applications 4, hyperthermia agent in medicine 5, etc. Nickel ferrite is one of the most important magnetic materials, which finds extensive use in high frequency application due to high resistivity and low eddy current losses 6, 7.…”

Effects of particle dipole interaction on the ac magnetically induced heating characteristics of ferrite nanoparticles for hyperthermia

“…5 It is well known that the "magnetic hysteresis loss" and the "relaxation loss" are primarily responsible for the physical mechanism of ⌬T ac,mag of the magnetic nanoparticles. 6 Particularly, since the contribution of the magnetic hysteresis loss to the ⌬T ac,mag has been confirmed more dominant in ferrimagnetic nanoparticles, 7 research efforts to improve the ⌬T ac,mag /SAR of magnetic nanoparticles have been intensively focused on increasing the magnetic hysteresis loss, e.g., controlling both magnetic susceptibility ͑ m = m Ј + i m Љ ͒ and magnetic moment ͓M = m H = ͑ m Ј + i m Љ ͒H͔ of existing magnetic nanoparticles as well as developing soft magnetic particles. 8,9 From this physical viewpoint, controlling magnetic dipole interaction formed among the magnetic nanoparticles can be an approach to enhance the magnetic hysteresis loss because the particle dipole interaction would directly influence the variation in magnetic susceptibility and moment of magnetic nanoparticles.…”

“…The magnetic hysteresis ͑M-H͒ loops and the ⌬T ac,mag characteristics were measured by using a vibrating sample magneto-meter and a specially designed rf-induced LC coil, respectively. 7 The applied ac magnetic field H appl and the frequency f appl during the temperature measurement were varied from 50 to 140 Oe and from 40 to 210 kHz, respectively. The SAR was determined from the experimentally obtained heating temperature.…”