Local-moment ferromagnetism and unusual magnetic domains in Fe${}_{1/4}$TaS${}_2$ crystals

Abstract

Single crystals of Fe${}_{1/4}$TaS${}_2$ have been studied by using magneto-optical (MO) imaging and radio-frequency (rf) magnetic susceptibility, $\chi$. 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 $\chi (T)$ show well-defined, local moment ferromagnetic transition at $T\approx 155$ K as well as thermal hysteresis for 50 K$<T<$60 K. This temperature range corresponds to the domain formation temperature as determined by MO. Together these observations provide strong evidence for local moment ferromagnetism in Fe${}_{1/4}$TaS${}_2$ crystals with large, temperature dependent magnetic anisotropy.

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• Precise measurements of radio-frequency magnetic susceptibility in (anti)ferromagnetic materials
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