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Local-moment ferromagnetism and unusual magnetic domains in Fe_1/4TaS₂ crystals

M. D. Vannette, S. Yeninas, E. Morosan, R. J. Cava, R. Prozorov

Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011

Submitted: 16 May 2009

Abstract

Single crystals of Fe_1/4TaS₂ 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=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_1/4TaS₂ crystals with large, temperature dependent magnetic anisotropy.

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If you have questions regarding this page and its content, please contact Ruslan Prozorov: prozorov @ ameslab.gov

Warming up after cooling in 1.5 kOe and turning the field off. (Video of Fig.3 of the manuscript)

Turning magnetic field off at 125 K

(C) Ruslan Prozorov, May 2009