Heating ferrite powder with AC magnetic field for thermal coagulation therapy

Electrical and magnetic behaviour of nanostructured MgFe2O4 spinel ferrite

“…Spinel ferrites have high electrical resistivities and low dielectric losses which are useful in microwave devices, computer memories and magnetic recording. Among the spinel ferrites family, magnesium ferrite is a soft magnetic n-type semiconducting material [2], which finds a number of applications in sensor technology, thermal coagulation therapy, in which tumors are locally heated by application of alternating magnetic fields [3]. The structural formula of MgFe 2 O 4 is generally written as (Mg 1− Fe )[Mg Fe 2− ]O 4 , where parentheses and square brackets indicate cation site of tetrahedral (A) and octahedral [B] coordination, respectively, and where represents the degree of inversion defined as a fraction of (A) sites occupied by Fe 3+ ions.…”

Feasibility of New Heating Method of Hepatic Parenchyma Using a Sintered MgFe2O4 Needle Under an Alternating Magnetic Field

“…Magnetic metal particles mildly induce heat energy in an alternating magnetic field (AMF) because of hysteresis loss effects. We selected magnesium ferrite (MgFe 2 O 4 ) as the ferromagnetic metal because it is unreactive in the living human body and provides effective heating [11,12]. MgFe 2 O 4 particles were formed into a small needle and prepared by sintering at 1100°C to safely obtain a greater heating effect and target the correct area in the liver tissue.…”

In situ synthesis of high density magnetic ferrite spinel (MgFe2O4) compacts using a mixture of conventional raw materials and waste iron oxide

“…It has a cubic structure of the normal spinel-type and is a soft magnetic n-type semiconducting material, which finds a wide number of applications in heterogeneous catalysis [2][3][4][5], gas sensors [6,7], transformers, ferrofluids and magnet core of coils [3,[8][9][10][11]. It has been demonstrated that this material can be used for thermal coagulation therapy, in which tumors are locally heated by application of an alternating magnetic field [12]. The general formula of magnesium ferrite, MgFe 2 O 4 , could be written as (Mg 1−x Fe x )[Mg x Fe 2−x ]O 4 , where parentheses and square brackets denote cation sites of tetrahedral (A) and octahedral [B] coordination, respectively.…”