Magnetocrystalline Anisotropy of Europium Sulfide

Abstract

The first-and second-order magnetocrystalline anisotropy constants, K x and K 2 , of EuS were measured by a ferromagnetic resonance technique. The measurements were performed at 21.48 GHz and 1.35°K, and the sample was a small, highly polished strain-free single-crystal sphere, oriented so that the (110) plane contained both the rf and static magnetic fields. The linewidth was of order 10 Oe, the narrowest observed in a chalcogenide of europium and indicates the degree of perfection and purity of the sample. Ki/M and K2/M (where M is the saturation magnetization) were determined to be -19.6dbl.O and -4.6±0.3 Oe, respectively. The cubic crystal-field splitting parameters 64 and h were calculated on the basis of Wolf's single-ion mechanism, and were determined to be (0,268±0.014) X 10~4 and (-0.019±0.09) X 10~4 cm" 1 , respectively. The results are compared with the behavior of the Eu + + ion in cubic host lattices.

Proximity-Driven Enhanced Magnetic Order at Ferromagnetic-Insulator–Magnetic-Topological-Insulator Interface

“…where α i is the directional cosine along the ith direction, M s is the saturation magnetism per area, t is the thickness of the FM layer, and the anisotropic constants κ 1 ¼ −19.6 Oe and κ 2 ¼ −4.6 Oe at T ¼ 1.3 K [26]. Since our interest is in thin film structures with a single symmetry axis [y axis in Fig.…”

“…1(a). The EuS has in-plane anisotropy [24][25][26][27] within the xz plane, PRL 115, 087201 (2015) P H Y S I C A L …”

“…1(a). The EuS has in-plane anisotropy [24][25][26][27] within the xz plane, while the TM-doped TI has easy axis out-of-plane [10,14,20] along the y axis. The different anisotropy directions and a strong interfacial spin-orbit coupling create a complex magnetic environment for the interfacial EuS [ Fig.…”

Magnetocrystalline Anisotropy of Europium Selenide

“…Anisotropy is therefore predicted by the crystal-field splitting. Paramagnetic resonance experiments on Eu ++ ions in cubic host lattices [15][16][17][18][19] parameters to the magnetic anisotropy constants, the results being Ki=hf(y)+b 6 g(y), K 2 = b 6 h(y) y (6) where f(y) = (5/Z 0 )(-7+13y+3f-9f-9y*+3y 5 + 13/-7y 7 ),…”

“…The crystal-field splitting parameter b& versus lattice spacing determined for EuO, EuS, EuSe, and Eu + + ions in various host lattices.33 Errors have been found in the expressions iorf(x) and g(x) in the paper of Franzblau, Everett, and Lawson (Ref 17),. corresponding to our expressions/(y) and g(y)in Eq (7)…”