RKKY Ferromagnetism with Ising-Like Spin States in IntercalatedFe1/4TaS2

Abstract

We investigated the magnetic nature of Fe(1/4)TaS2 using x-ray absorption spectroscopy, photoemission spectroscopy, and first principles band calculations. The results show a large unquenched orbital magnetic moment (∼1.0 μ(B)/Fe) at intercalated Fe sites, resulting in a gigantic magnetic anisotropy (H(A)≃60 T). The magnetic coupling is well understood in terms of the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, suggesting a novel RKKY ferromagnet with Ising-type spin states. We also found that this indirect exchange coupling between the neighboring Fe spins is ferromagnetic and maximized at the Fe-Fe distance of 2×2 superstructure.

Anomalous Hall effect mechanisms in the quasi-two-dimensional van der Waals ferromagnet Fe0.29TaS2

“…[25]). These squarelike AHE curves indicate the strong out-of-plane magnetic anisotropy of the Fe0.29TaS2 thin flake, which is consistent with previous study reporting Ising-like spin states in bulk FexTaS2 single crystals [24]. At relative high magnetic fields, the negative sign of the slope for Rxy vs B indicates that the carriers are hole-type.…”

“…Interestingly, Bc is only ≈ 0.04 T at T = 10 K for this 14-nm Fe0.29TaS2 device ( Fig. 2(a)), which is significantly small compared to Bc of the bulk FexTaS2 [21][22][23][24]. To investigate the underlying mechanism for the variation of Bc, we perform the AHE measurements on the devices fabricated on Fe0.29TaS2 thin flakes with thickness from 14 nm to bulk single crystal.…”

“…Figure 1(a) shows the crystalline structure of the layered Fe-intercalated van der Waals ferromagnet FexTaS2, where the Fe atoms are located between the two TaS2 layers. These layers are stacked together via van der Waals interaction with an interlayer distance of ≈ 6 Å. FexTaS2 single crystals are synthesized using the iodine vapor transport method, as described in previous reports [16,[21][22][23][24]. The concentration of Fe (x) in synthesized FexTaS2 single crystals is determined to be 0.29 by energy-dispersive spectroscopy ( Fig.…”

Magnetic properties ofSr3NiIrO6andSr3CoIrO6: Magnetic hysteresis with coercive fields of up to 55 T

“…This is reflected in the coercive fields, which even in the most robust members of the Sm-Co and Nd-Fe-B families [42][43][44] are less than 2 T, even at low temperatures, despite large exchange energies manifested as ferromagnetic ordering temperatures ∼600-1000 Kelvin. At cryogenic temperatures, magnetic hysteresis effects can extend to higher fields ≈10 T in other ferromagnets, such as the colossal magnetoresistance manganites, and in Li 2 (Li 1−x Fe x )N, Gd 5 Ge 4 , Ga-doped CeFe 2 , LuFe 2 O 4 , and Fe 1/4 TaSe 2 [45][46][47][48][49][50][51]. Large coercive fields in such magnets are typically caused by magnetocrystalline anisotropy due to spin-orbit interactions [44].…”

Strain-induced modulation of exchange interaction in monolayer zigzag nanoribbons of B2S

“…(a,b) When both the impurities are located on the edge, such that the one of the spins is fixed at the edge site with (10, 1) and another can be located on lattice points (n, 1). (c,d) When both the impurities are located in the interior of the ZBSNR, such that the one of spins is fixed at the lattice site with coordinate (10,8) and another can be located on lattice points (n, 8). χ S 1 ( 7 0 , 1 ) , S 2 ( 7 8 , 1 ) S 1 ( 7 0 , 1 ) , S 2 ( 7 9 , 1 ) S 1 ( 7 0 , 1 ) , S 2 ( 8 0 , 1 ) ( a ) S 1 ( 7 0 , 1 ) , S 2 ( 7 8 , 1 ) S 1 ( 7 0 , 1 ) , S 2 ( 7 9 , 1 ) S 1 ( 7 0 , 1 ) , S 2 ( 8 0 , 1 ) ( b ) ε y ε y ( c ) S 1 ( 7 0 , 9 ) , S 2 ( 7 8 , 9 ) S 1 ( 7 0 , 9 ) , S 2 ( 7 9 , 9 ) S 1 ( 7 0 , 9 ) , S 2 ( 8 0 , 9 ) χ S 1 ( 7 0 , 9 ) , S 2 ( 7 8 , 9 ) S 1 ( 7 0 , 9 ) , S 2 ( 7 9 , 9 ) S 1 ( 7 0 , 9 ) , S 2 ( 8 0 , 9 ) ( d ) ε x S 1 ( 7 0 , 1 ) , S 2 ( 7 8 , 1 ) S 1 ( 7 0 , 1 ) , S 2 ( 7 9 , 1 ) S 1 ( 7 0 , 1 ) , S 2 ( 8 0 , 1 ) χ ( a ) S 1 ( 7 0 , 1 ) , S 2 ( 7 8 , 1 ) S 1 ( 7 0 , 1 ) , S 2 ( 7 9 , 1 ) S 1 ( 7 0 , 1 ) , S 2 ( 8 0 , 1 ) ( b ) ε y S 1 ( 7 0 , 1 0 ) , S 2 ( 7 8 , 1 0 ) S 1 ( 7 0 , 1 0 ) , S 2 ( 7 9 , 1 0 ) S 1 ( 7 0 , 1 0 ) , S 2 ( 8 0 , 1 0 ) ( c ) χ ε x S 1 ( 7 0 , 1 0 ) , S 2 ( 7 8 , 1 0 ) S 1 ( 7 0 , 1 0 ) , S 2 ( 7 9 , 1 0 ) S 1 ( 7 0 , 1 0 ) , S…”