Large Orbital Magnetic Moment and Strong Perpendicular Magnetic Anisotropy in Heavily Intercalated Fe${}_x$TiS${}_2$

Abstract

Titanium disulfide TiS${}_2$, which is a member of the layered transition-metal dichalcogenides with the 1T-CdI${}_2$-type crystal structure, is known to exhibit a wide variety of magnetism through intercalating various kinds of transition-metal atoms of different concentrations. Among them, Fe-intercalated titanium disulfide Fe${}_x$TiS${}_2$ is known to be ferromagnetic with strong perpendicular magnetic anisotropy (PMA) and large coercive fields ($H_{\text{c}}$). In order to study the microscopic origin of the magnetism of this compound, we have performed X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) measurements on single crystals of heavily intercalated Fe${}_x$TiS${}_2$ ($x\sim 0.5$). The grown single crystals showed a strong PMA with a large $H_{\text{c}}$ of ${\mu }_0{H}_{\text{c}}\simeq 1.0\text{T}$. XAS and XMCD spectra showed that Fe is fully in the valence states of 2+ and that Ti is in an itinerant electronic state, indicating electron transfer from the intercalated Fe atoms to the host TiS${}_2$ bands. The Fe${}^{2+}$ ions were shown to have a large orbital magnetic moment of $\simeq 0.59{\mu }_{\text{B}}\text{/Fe}$, to which, combined with the spin-orbit interaction and the trigonal crystal field, we attribute the strong magnetic anisotropy of Fe${}_x$TiS${}_2$.

24 pages, 8 figures

References in corpus (2)

• Anisotropic spin-density distribution and magnetic anisotropy of strained La${}_{1-x}$Sr${}_x$MnO${}_3$ thin films: Angle-dependent x-ray magnetic circular dichroism
• Magnetotransport in Fe-intercalated \textit{T}S${}_2$: the comparison between \textit{T} = Ti and Ta

Cited by in corpus (1)

• Fe contribution to the magnetic anisotropy of $L{1}_0$-ordered FePt thin films studied by angle-dependent x-ray magnetic circular dichroism