Effects of Pressure on Two-Dimensional Networked Single-Molecule Magnets Exhibiting AC-Field-Switchable Magnetic Properties

We investigated, through the measurement of nonlinear magnetic responses, the effects of pressure on two-dimensional (2D) networked single-molecule magnets (SMMs), in which the Ising nature of SMMs and their aggregates (SMM-aggregates) competed with the magnetic correlation between SMMs or between SMM-aggregates, respectively. At ambient pressure, as the frequency of the AC field increases, the initial magnetic behavior of SMM-aggregate consisting of several SMMs transforms to that shown by individual SMMs. We investigated the effects of pressure on the above AC-field-switchable magnetic properties by varying temperature, AC field frequency, and pressure. Pressurization destroyed the regular intermolecular network, and above approximately 3 kbar, the magnetic network was enlarged randomly. Hence, the regularity in SMM-aggregate is weakened with increasing pressure, resulting in the suppression of the Ising nature of SMM-aggregate. Furthermore, above approximately 3 kbar, a glassy behavior becomes prominent owing to the randomness in the Ising nature of SMM.