Fig. 1: Schematic diagram for hysteresis loops of different kinds of magnetic materials and diagram of the relaxation processes in a typical SMM.
From: Triply halogen-bridged erbium compounds with hard single-molecule magnet behavior
a Hysteresis loops for a soft magnetic material (orange, featuring a narrow hysteresis curve with low coercivity and low remanence), a hard magnetic material (sky blue, a large hysteresis due to the high coercivity and remanence), and for an SMM with strong QTM (olive green, showing a “butterfly-like” hysteresis loop that features low coercivity and low remanence near zero field while remaining open at higher fields). b A diagram of the relaxation processes in a typical SMM with the Orbach, Raman, and QTM processes dominating the magnetic relaxation at high, intermediate, and low temperatures, respectively. The direct process becomes significant only under high magnetic fields.
