Abstract
A localized RF-heating system can be built in an arrangement similar to typical hyperthermia measurements, just by substituting the nanoparticle suspension by a consolidated ferro- or ferrimagnetic material. In this work, we show that such an arrangement allows the controlled RF-heating of small bodies (typically for annealing or curing of integrated circuits). Yttrium iron garnet, Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> (YIG), prepared by a novel technique involving a soft chemistry synthesis followed by consolidation by Reactive Spark Plasma Sintering, was chosen as ferrimagnetic material. A study of the resulting heating phenomenon is presented, and its general features are discussed. It appears that in the case investigated, the main heating process is associated with the magnetic hysteresis of the material.
Highlights
Magnetic hyperthermia of nanoparticle (NP) suspensions has been among the most attractive research subjects in the last 20 years, and impressive progress and developments have been made, especially in the perspective of antitumor applications [1,2]
To the best of our knowledge, RF technical heating by means of a consolidated magnetic material subjected to an AC magnetic field has not been studied so far
The reactive spark plasma sintering (RSPS) process produced a nanostructured solid with high density and grains in the 150 nm range
Summary
Magnetic hyperthermia of nanoparticle (NP) suspensions has been among the most attractive research subjects in the last 20 years, and impressive progress and developments have been made, especially in the perspective of antitumor applications [1,2]. Radiofrequency (RF) energy has been applied directly (i.e., no NPs involved) in many medical devices to induce a variety of metabolic processes in tissues [3]. To the best of our knowledge, RF technical heating by means of a consolidated magnetic material subjected to an AC magnetic field has not been studied so far. RF local heating by means of materials with proper geometry can be very useful in a variety of applications, such as annealing integrated circuits on flexible plastic substrates [4] or curing processes in wafers [5]. The heating rate and the stabilization temperature can be controlled in a straightforward way by playing on the amplitude and frequency of the AC magnetic field. The size and geometry of the magnetic material could allow a finely localized heating, preserving areas sensitive to high temperatures
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