Magnetically tuning microwave propagation parameters in ferrofluids P. C. Fannin, O. M. Bunoiu, I. Malaescu, C. N. Marin and D. Ursu Eur. Phys. J. E, 44 6 (2021) 83 Published online: 22 June 2021 DOI: 10.1140/epje/s10189-021-00087-w