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As the ability to generate magnetic anisotropy in molecular materialscontinues to hit new milestones, concerted effort has shifted towardsunderstanding, and potentially controlling, the mechanisms of magneticrelaxation across a large time and temperature space. Slow magnetic relaxationin molecules is highly temperature-, field-, and environment-dependent with therelevant timescale easily traversing ten orders of magnitude for currentsingle-molecule magnets (SMM). The prospect of synthetic control over thenature of (and transition probabilities between) magnetic states makeunraveling the underlying mechanisms an important yet daunting challenge.Currently, instrumental considerations dictate that the characteristicrelaxation time, $\tau$, is determined by separate methods depending on thetimescale of interest. Static and dynamic probe fields are used for long andshort timescales, respectively. Each method captures a distinct,non-overlapping time range, and experimental differences lead to thepossibility of fundamentally different meanings for $\tau$ being plotted andfitted globally as a function of temperature. Herein, we present a method togenerate long-timescale waveforms with standard vibrating sample magnetometry(VSM) instrumentation, allowing extension of alternating current (AC) magneticimpedance measurements to SMMs and other superparamagnets with arbitrarily longrelaxation time.

Extending generalized Debye analysis to long timescale magnetic relaxation