X-ray magnetic circular dichroism—A versatile tool to study magnetism

Laan, G. van der; Figueroa, A. I.

doi:10.1016/j.ccr.2014.03.018

Cited by 330 publications

(279 citation statements)

References 238 publications

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“…24,25 In this anisotropic situation, possible contributions of the magnetic dipole term T z to the effective spin magnetization 46 have to be considered, because these could affect the experimental ratio of orbital-to-effective-spin magnetization. [47][48][49][50][51] In cylindrical symmetry, the magnetic dipole term has components parallel (T ) and perpendicular (T ⊥ ) to the molecular axis, with 2 T ⊥ = −T . These will cancel out in the angular average of freely rotating states.…”

Section: Contribution Of the Magnetic Dipole Term T Z To The Effectivmentioning

confidence: 99%

Electronic ground states of Fe2+ and Co2+ as determined by x-ray absorption and x-ray magnetic circular dichroism spectroscopy

Zamudio-Bayer

Hirsch

Langenberg

et al. 2015

The Journal of Chemical Physics

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Section: Contribution Of the Magnetic Dipole Term T Z To The Effectivmentioning

confidence: 99%

Electronic ground states of Fe2+ and Co2+ as determined by x-ray absorption and x-ray magnetic circular dichroism spectroscopy

Zamudio-Bayer

Hirsch

Langenberg

et al. 2015

The Journal of Chemical Physics

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“…The curvature of our Arrott plots is typical for such systems arising from magnetic disorder [25,26]. XMCD Arrott plots have only been sparsely reported [27]; however, this technique offers the great advantage of allowing independent determination of the magnetic behavior of different elements, enabling one to distinguish between different layers [19].…”

mentioning

confidence: 99%

“…X-ray absorption spectroscopy (XAS) at the Cr and Co L 2,3 edges was detected in bulk-sensitive fluorescence yield (FY) mode and in total-electron-yield (TEY) mode, which is surface sensitive with a probing depth of 3 to 5 nm [19]. The XMCD was obtained as the difference between two XAS spectra recorded with the helicity vector antiparallel and parallel to the applied magnetic field (μ − − μ + ), where μ is the absorption coefficient.…”

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confidence: 99%

Magnetic proximity-enhanced Curie temperature of Cr-dopedBi2Se3thin films

et al. 2015

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We report a study on the transition temperature T C of Cr-doped topological insulator thin films, where an increase in the ferromagnetic onset can provide a pathway towards low-power spintronics in the future. Arrott plots, measured by surface-sensitive x-ray magnetic circular dichroism at the Cr L 2,3 edge as a function of field at various low temperatures, give a T C ≈ 7 K for the pristine surface. This is comparable to the bulk value of the film, which means that there is no indication that the spontaneous magnetization is different near the surface. Evaporation of a thin layer of Co onto the pristine surface of the in-situ cleaved sample increases the ordering temperature near the surface to ∼19 K, while in the bulk it rises to ∼10 K. X-ray absorption spectroscopy shows that Cr enters the Bi 2 Se 3 host matrix in a divalent state, and is unchanged by the Co deposition. These results demonstrate a straightforward procedure to increase the transition temperature of doped topological insulators.

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“…The XMCD is obtained from the difference between two XAS spectra recorded with the x-ray helicity vector and applied magnetic field parallel and antiparallel, respectively. 35 The magnetic field is always parallel to the x-ray beam and the samples (with the normal k c-axis) were measured at both normal and grazing incidence.…”

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confidence: 99%

Study of Ho-doped Bi2Te3 topological insulator thin films

Harrison

Collins-McIntyre

Zhang

et al. 2015

Applied Physics Letters

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Breaking time-reversal symmetry through magnetic doping of topological insulators has been identified as a key strategy for unlocking exotic physical states. Here, we report the growth of Bi2Te3 thin films doped with the highest magnetic moment element Ho. Diffraction studies demonstrate high quality films for up to 21% Ho incorporation. Superconducting quantum interference device magnetometry reveals paramagnetism down to 2 K with an effective magnetic moment of ∼5 μB/Ho. Angle-resolved photoemission spectroscopy shows that the topological surface state remains intact with Ho doping, consistent with the material's paramagnetic state. The large saturation moment achieved makes these films useful for incorporation into heterostructures, whereby magnetic order can be introduced via interfacial coupling.

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X-ray magnetic circular dichroism—A versatile tool to study magnetism

Cited by 330 publications

References 238 publications

Electronic ground states of Fe2+ and Co2+ as determined by x-ray absorption and x-ray magnetic circular dichroism spectroscopy

Electronic ground states of Fe2+ and Co2+ as determined by x-ray absorption and x-ray magnetic circular dichroism spectroscopy

Magnetic proximity-enhanced Curie temperature of Cr-dopedBi2Se3thin films

Study of Ho-doped Bi2Te3 topological insulator thin films

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