Developing rich H vs. T diagrams of molecule-based multiferroics

The magnetization of two molecule-based multiferroics, (CH$_{\mathrm{3}})_{\mathrm{2}}$NH$_{\mathrm{2}}$]Mn(HCOO)$_{\mathrm{3}}$ and (NH$_{\mathrm{4}})_{\mathrm{2}}$FeCl$_{\mathrm{5}}$H$_{\mathrm{2}}$O, was measured using pulsed magnetic fields of up to 60 T and temperatures down to 0.5 K, to reveal their H vs. T phase diagrams.~ The results were compared with spin-density calculations, polarization measurements, neutron scattering, and magneto-infrared spectroscopy to understand the spin behavior of the two compounds. The ability of these experimental techniques to completely parameterize the quantum magnetism of such materials, combined with the use of molecular architecture to adjust bond lengths, potentials and interaction strengths with great subtlety, promises to yield significant progress in the field of multiferroics.