This presentation will navigate through examples of applications of magnetic materials at different scales. We will begin by exploring the diverse functionalities of magnetic nanoparticles, including the unusual ε-Fe2O3 phase [1-3]. We will touch on selected applications such as contrast agents for MRI, the recently emerged method of magnetic particle imaging [4] or sensing by using surface-enhanced Raman spectroscopy while keeping the magnetic responsiveness of the particles [5].
Shifting focus, we will introduce our recent investigations of langbeinite-type compounds featuring two frustrated trillium lattices of magnetic ions [6]. Frustrated magnets, characterized by competing magnetic interactions, hold immense potential for enhanced magnetocaloric performance. By combining detailed magnetic and thermodynamic measurements with the local probe of 57Fe Mössbauer spectroscopy, we will unveil the magnetocaloric behavior of the langbeinite phases [7]. Throughout, the critical role of fundamental understanding in exploiting the potential of these materials for diverse applications will be emphasized.
[1] L. Kubíčková, P. Brázda, M. Veverka et al., J. Magn. Magn. Mater. 480 (2019) 154–163.
[2] L. Kubíčková, O. Kaman, P. Veverka et al., Colloids Surfaces A Physicochem. Eng. Asp. 589 (2020) 124423.
[3] L. Kubíčková, O. Kaman, P. Veverka et al. J. Alloys Compd. 856 (2021) 158187.
[4] O. Kaman, D. Kubániová, L. Kubíčková et al., J. Alloys Compd. 978 (2024) 173022.
[5] D.T. Bui, L. Kubíčková, J. Kuličková et al. Analyst. 148 (2023) 5070-5083.
[6] J.M. Hopkinson, H.Y. Kee, Phys. Rev. B 74, (2006) 224441.
[7] L. Kubíčková, A. K. Weber, M. Panthöfer, A. Möller, Proc. Natl. Acad. Sci. U.S.A., under review (2024)