Fyzikální ústav Akademie věd ČR

Magnetization and sound propagation studied on a high-quality single crystal of ferrimagnetic compound TmFe₅Al₇ in high magnetic fields up to 60 Tesla reveal very unusual combination of spontaneous and field-induced transitions as the Tm provides an uniaxial magnetic anisotropy, whereas Fe favors an easy-plane anisotropy. This competition results in a  omplex scenario of magnetic order including in-plane antiferromagnetic phase embedded in low and high temperature ferrimagnetic phases.

Temperature dependency of TmFe₅Al₇ spontaneous magnetic moment. Phase transitions between magnetic structure of planar antiferromagnet, planar ferrimagnet and paramagnet are marked with dashed line.

¹Institute of Physics, Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic
²Department of Condensed Matter Physics, Charles University, Ke Karlovu 5, 121 16 Prague, Czech Republic
³Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany
⁴Institute of Metal Physics, Ural Branch of Russian Academy of Sciences, Kovalevskaya 18, 620990 Ekaterinburg, Russia
⁵Institut für Festkörperphysik, TU Dresden, D-01062 Dresden, Germany