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We report the discovery of a giant out-of-plane coercivity in the Fe-dopedMn3Sn single crystals. The compound of Mn2.42Fe0.58Sn exhibits a series ofmagnetic transitions accompanying with large magnetic anisotropy and electrictransport properties. Compared with the ab-plane easy axis in Mn3Sn, itswitches to the c-axis in Mn2.42Fe0.58Sn, producing a sufficiently largeuniaxial anisotropy. At 2 K, a giant out-of-plane coercivity (Hc) up to 3 T wasobserved, which originates from the large uniaxial magnetocrystallineanisotropy. The modified Sucksmith-Thompson method was used to determine thevalues of the second-order and the fourth-order magnetocrystalline anisotropyconstants K1 and K2, resulting in values of 6.0 * 104 J/m3 and 4.1 * 105 J/m3at 2 K, respectively. Even though the Curie temperature (TC) of 200 K forMn2.42Fe0.58Sn is not high enough for direct application, our research presentsa valuable case study of a typical uniaxial anisotropy material.

Giant coercivity induced by perpendicular anisotropy in Mn2.42Fe0.58Sn single crystals