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 twodimensional (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 SMMaggregate 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.