Glassy ferromagnetism inNi3Sn-typeMn3.1Sn0.9

Abstract

Magnetic measurements indicate that the glassy ferromagnetism exists in the ordered intermetallic ${\mathrm{Mn}}_{3.1}{\mathrm{Sn}}_{0.9}$ compound with ${\mathrm{Ni}}_3\mathrm{Sn}$-type structure. This glassy ferromagnetism exhibits both weak canonical behaviors, including a susceptibility sharp peak at $T_f=31.8\mathrm{K}$ and the frequency-dependent susceptibility below $T_f$, and long-range ferromagnetic ones, including a large coercivity and a magnetization increase after field-cooled below $T_f$. The glassy component is ascribed to both a small amount of disorder, arising from the random occupation of $2c$ sites in the space group $P{6}_3∕mmc$ by excess Mn atoms, and the common frustration. A power law for the critical slowing down gives the flipping time ${\tau }_0=3.9\times {10}^{-4}\mathrm{s}$, the collective freezing temperature $T_g=31.5\mathrm{K}$, and the dynamical exponent $z\nu =3.38$.