Element-specific magnetometry of EuS nanocrystals

Selinsky, Rachel S.; Keavney, D. J.; Bierman, Matthew J.; Jin, Song

doi:10.1063/1.3251777

Cited by 22 publications

(27 citation statements)

References 24 publications

(34 reference statements)

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“…235 The thickness of the thin films was estimated to be 1.5¯m using a laser scanning microscope (Figure 32b). The electron diffraction patterns of EuS tiny nanoparticles determined using TEM measurements were also found to be in good agreement with those of the corresponding (111), (200), (220), and (311) planes of NaCl-type EuS, respectively (Figure 32a, inset). The EuS particle size from TEM measurements is found to be approximately 9 nm.…”

Section: Lanthanoid Nanocrystals IVsupporting

confidence: 55%

Photofunctional Lanthanoid Complexes, Coordination Polymers, and Nanocrystals for Future Photonic Applications

Hasegawa

2014

Bulletin of the Chemical Society of Japan

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In this account, lanthanoid complexes, coordination polymers, and nanocrystals with photofunctional properties are introduced. To maintain the effective emission of Nd(III), Sm(III), Eu(III), Tb(III), and Yb(III) ions in organic media, the coordination sphere of the lanthanoid ions should consist of strong, bulky, and asymmetric ligands with low vibrational frequencies, that is, there are three criteria for luminescence: 1) suppression of vibrational relaxation, 2) prevention of nonradiative cross relaxation at diffusional collision, and 3) introduction of asymmetric coordination geometry for enhancing electric dipole transition. Lanthanoid coordination compounds with characteristic photosensitizing properties, photochromic properties, circularly polarized luminescence (CPL), metal ion sensing properties, solvent sensing properties, energy-conversion properties, thermostable properties, triboluminescent properties, and thermosensing properties are also described for the development of photofunctional materials. In the second half, the synthesis, photophysical magnetic, and magneto-optical properties of lanthanoid nanocrystals, EuO, EuS, and EuSe, are reported. In particular, the remarkable photophysical properties of nanoaggregates composed of EuS nanocrystals are presented. Photofunctional lanthanoid(III) complexes, coordination polymers, and nanocrystals are expected to open up a frontier field of materials science.

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Section: Lanthanoid Nanocrystals IVsupporting

confidence: 55%

Photofunctional Lanthanoid Complexes, Coordination Polymers, and Nanocrystals for Future Photonic Applications

Hasegawa

2014

Bulletin of the Chemical Society of Japan

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“…PXRD (Figure S2) gave peaks consistent with a rock-salt crystal structure and no other crystalline phase of rare earth compound, although from previous study we know there is likely an amorphous component 58. GdS and EuS share the same rock-salt structure and nearly the same lattice parameters (EuS is 6.7 % larger) 35,36.…”

Section: Resultsmentioning

confidence: 74%

“…The trends in magnetic behavior are qualitatively comparable to those observed for bulk Gd doped EuS samples. In order to fully understand the contributions from Gd and Eu to the observed magnetism, these Eu 1- x Gd x S NC samples will be further investigated using X-ray magnetic circular dichroism (XMCD) techniques58 in the future.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Magnetic Properties of Gd Doped EuS Nanocrystals with Enhanced Curie Temperatures

et al. 2010

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EuS nanocrystals (NCs) were doped with Gd resulting in an enhancement of their magnetic properties. New EuS and GdS single source precursors (SSPs) were synthesized, characterized, and employed to synthesize Eu1-xGdxS NCs by decomposition in oleylamine and trioctylphosphine at 290 °C. The doped NCs were characterized using X-ray diffraction, transmission electron miscroscopy and scanning transmission electron microscopy, which supports the uniform distribution of Gd dopants through electron energy loss spectroscopy (EELS) mapping. X-ray absorption spectroscopy (XAS) revealed the dopant ions in Eu1-xGdxS NCs to be predominantly Gd3+. NCs with a variety of doping ratios of Gd (0 ≤ x < 1) were systematically studied using vibrating sample magnetometry and the observed magnetic properties were correlated with the Gd doping levels (x) as quantified with ICP-AES. Enhancement of the Curie temperature (TC) was observed for samples with low Gd concentrations (x ≤ 10 %) with a maximum TC of 29.4 K observed for NCs containing 5.3 % Gd. Overall, the observed TC, Weiss temperature (θ), and hysteretic behavior correspond directly to the doping level in Eu1-xGdxS NCs and the trends qualitatively follow those previously reported for bulk and thin film samples.

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“…Europium has the advantage for magnetic investigations as a Mossbauer active nuclei, but the disadvantage that neutron diffraction is quite difficult due to the high absorption rate of neutrons by Europium. Although not discussed here, X-ray magnetic circular dichroism is another excellent probe of magnetic europium materials [119]. The magnetic studies of europium sulfide suggest that the ferromagnetic coupling is weakened in small nanoparticles.…”

Section: Discussionmentioning

confidence: 98%