Abstract
The heating properties of Fe71.7Si11B13.4Nb3Ni0.9 amorphous glass-coated microwires are explored for prospective applications in magnetic hyperthermia. We show that a single 5 mm long wire is able to produce a sufficient amount of heat, with the specific loss power (SLP) reaching a value as high as 521 W/g for an AC field of 700 Oe and a frequency of 310 kHz. The large SLP is attributed to the rectangular hysteresis loop resulting from a peculiar domain structure of the microwire. For an array of parallel microwires, we have observed an SLP improvement by one order of magnitude; 950 W/g for an AC field of 700 Oe. The magnetostatic interaction strength essential in the array of wires can be manipulated by varying the distance between the wires, showing a decreasing trend in SLP with increasing wire separation. The largest SLP is obtained when the wires are aligned along the direction of the AC field. The origin of the large SLP and relevant heating mechanisms are discussed.
Highlights
(c) of Fe71.7Si11B13.4Nb3Ni0.9 at different values of AC field
We report upon the excellent heating properties of Fe71.7Si11B13.4Nb3Ni0.9 amorphous glass-coated microwires (AGCMs)
We have shown that the Fe-based AGCMs possess considerable heating properties and, in addition to their low-cost fabrication, they are a promising candidate material for prospective applications in magnetic hyperthermia
Summary
(c) of Fe71.7Si11B13.4Nb3Ni0.9 at different values of AC field. Photography and infra-red thermal camera images of the microwire during AC hyperthermia (d–f). The use of magnetic fibers or wires for minimally invasive hyperthermia has recently been proposed[13,15]. To this respect, soft ferromagnetic amorphous glass-coated microwires (AGCMs) prepared by the modified Taylor-Ulitovsky technique are very promising. Fe-based AGCMs characterized by high positive magnetostriction, rectangular hysteresis loops, as well as high saturation magnetization[18,22] are expectedly desirable for magnetic hyperthermia Given their finite length and mechanical flexibility, the microwires can be passed through a guide needle into the tumor area, and after the heating treatment, they can be extracted as a pin, contrary to the nanoparticles. We report upon the excellent heating properties of Fe71.7Si11B13.4Nb3Ni0.9 AGCMs
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