Abstract
Single crystals of ${\text{Fe}}_{1/4}{\text{TaS}}_{2}$ have been studied by using magneto-optical (MO) imaging and radio-frequency magnetic susceptibility, $\ensuremath{\chi}$. Real-time MO images reveal unusual slow dynamics of dendritic domain formation, the details of which are strongly dependent upon magnetic and thermal history. Measurements of $\ensuremath{\chi}(T)$ show well-defined local-moment ferromagnetic transition at $T\ensuremath{\approx}155\text{ }\text{K}$ as well as thermal hysteresis for $50lTl60\text{ }\text{K}$. This temperature range corresponds to the domain-formation temperature as determined by MO. Together these observations provide strong evidence for local-moment ferromagnetism in ${\text{Fe}}_{1/4}{\text{TaS}}_{2}$ crystals with large temperature-dependent magnetic anisotropy.
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