Prof. Dr.-Ing. habil. Jens Haueisen
Director of the BMTI Institute and head of Biomedical Engineering Group
Prof. Dr.-Ing. habil. Jens Haueisen
phone: +49 3677 69 2861
Magnetic nanoparticles can be heated in an external alternating magnetic field and used for various applications in medicine and technology. Such magnetic particles can be used in medical hyperthermia, which is used for tumour therapy. The particles are also of interest for extracorporeal applications, such as thermal markers on rapid tests, where they do not need to be applied inside a patient or organism. In this case, higher external field and thereby more hard-magnetic particles can be used. Therefore, in the publication by Zahn et al., magnetic particles made of M-type barium hexaferrite were synthesized and tested for their suitability for magnetic heating. It was demonstrated that the coercive field strength, which is a measure of the magnetic hardness of a material, can be altered by suitable synthesis parameters. With this, coercivity can be lowered in contrast to the typically extremely high values of up to 450 kA/m for barium ferrite. This enabled the successful synthesis of particles with a coercive field strength within a range suitable for magnetic heating. By varying the ratio of iron and barium ions in the hexaferrite, it was possible to adjust the coercivity between 35 and 240 kA/m in a controllable manner. This paves the way for future optimisation and utilisation of barium hexaferrite particles for magnetic heating.
Zahn, D.; Diegel, M.; Valitova, A.; Dellith, J.; Dutz, S. Magnetic Barium Hexaferrite Nanoparticles with Tunable Coercivity as Potential Magnetic Heating Agents. Nanomaterials 2024, 14, 992. DOI: 10.3390/nano14120992
https://www.mdpi.com/2079-4991/14/12/992
Contact: Prof. Dutz