X-ray photoelectron spectroscopic study of ordered stoichiometric FeAl fractured in situ

Oku, Masaoki; Masahashi, Naoya; Hanada, Shuji; Wagatsuma, Kazuaki

doi:10.1016/j.jallcom.2005.05.043

Cited by 20 publications

(11 citation statements)

References 20 publications

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“…Hence, with the coexistence of both these phases in the system, the observed moment is expected to lie in between these two magnetic moment values, which is observed in our case. Oku et al, [12] obtained similar magnetic moment of ∼1.7µ B in FeAl. They have attributed it to the moment present in the surface slab layers.…”

Section: Resultsmentioning

confidence: 74%

“…X-ray photoemission (XPS) valence band of FeAl multilayer sample showed appreciable changes in the Fe 3d and the Al 3s density of states as a function of annealing which are attributed to the strong sp − d hybridization at the Fermi level (E F ) [11]. Oku et al [12] reported a magnetic moment of 1.7 µ B in the PM phase from the analysis of Fe 3s XPS core level spectra. They attributed the presence of moments in this system to the magnetic ordering in the sub-surface layers.…”

Section: Introductionmentioning

confidence: 99%

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Electronic structure of FeAl alloy studied by resonant photoemission spectroscopy and Ab initio calculations

Mondal

Banik

Kamal

et al. 2016

Journal of Alloys and Compounds

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Abstract. Resonant photoemission spectroscopy has been used to investigate the character of Fe 3d states in FeAl alloy. Fe 3d states have two different character, first is of itinerant nature located very close to the Fermi level, and second, is of less itinerant (relatively localized character), located beyond ∼2 eV below the Fermi level. These distinct states are clearly distinguishable in the resonant photoemission data. Comparison between the results obtained from experiments and first principle based electronic structure calculation show that the origin of the itinerant character of the Fe 3d states is due to the ordered B2 structure, whereas the relatively less itinerant (localized) Fe 3d states are from the disorders present in the sample. The exchange splitting of the Fe 3s core level peak confirms the presence of local moment in this system. It is found that the itinerant electrons arise due to the hybridization between Fe 3d and Al 3s − 3p states. Presence of hybridization is observed as a shift in the Al 2p core-level spectra as well as in the X-ray near edge absorption spectra towards lower binding energy. Our photoemission results are thus explained by the co-existence of ordered and disordered phases in the system.

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Section: Resultsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Electronic structure of FeAl alloy studied by resonant photoemission spectroscopy and Ab initio calculations

Mondal

Banik

Kamal

et al. 2016

Journal of Alloys and Compounds

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“…Multiplying the S V values by the spin factor g = 2, one correspondingly obtains the values for the Fe LSM. We follow this same approach given the itinerant character of the Fe-HTSC (See Supplementary Online Text) [26,27,28,29,30,31,32,33,34,35,36,37].The values of ΔE 3s are obtained with a two-component fit of the Fe 3s spectra, with uncertainty being estimated to be ± 100 meV and ± 50 meV for the HAXPES and PES spectra, respectively.The values of ΔE 3s , the corresponding S V values, and the inferred values of the LSM are shown 6 in Fig. 2.…”

mentioning

confidence: 99%

Itinerant electrons, local moments, and magnetic correlations in the pnictide superconductors CeFeAsO1−xFxand Sr(Fe
Vilmercati
¹
,
Fedorov
²
,
Bondino
³

et al. 2012
Phys. Rev. B

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A direct and element-specific measurement of the local Fe spin moment has been provided by analyzing the Fe 3s core level photoemission spectra in the parent and optimally doped CeFeAsO 1-x F x (x = 0, 0.11) and Sr(Fe 1-x Co x ) 2 As 2 (x = 0, 0.10) pnictides. The rapid time scales of the photoemission process allowed the detection of large local spin moments fluctuating on a 10 -15 s time scale in the paramagnetic, anti-ferromagnetic and superconducting phases, indicative of the occurrence of ubiquitous strong Hund's magnetic correlations. The magnitude of the spin moment is found to vary significantly among different families, 1.3  B in CeFeAsO and 2.1  B in SrFe 2 As 2 . Surprisingly, the spin moment is found to decrease considerably in the optimally doped samples, 0.9 B in CeFeAsO 0.89 F 0.11 and 1.3 B in Sr(Fe 0.9 Co 0.1 ) 2 As 2 . The strong variation of the spin moment against doping and material type indicates that the spin moments and the motion of itinerant electrons are influenced reciprocally in a self-consistent fashion, reflecting the strong competition between the antiferromagnetic super-exchange interaction among the spin moments and the kinetic energy gain of the itinerant electrons in the presence of a strong Hund's coupling. By describing the evolution of the magnetic correlations concomitant with the appearance of superconductivity, these results constitute a fundamental step toward attaining a correct description of the microscopic mechanisms shaping the electronic properties in the pnictides, including magnetism and high temperature superconductivity.

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“…30,31 As it can be observed in Fig. 8, the plasmon structures are replaced by a broader band in the spectrum for region R2, which is known to be characteristic for the formation of an FeAl alloy.…”

Section: X-ray Magnetic Circular Dichroism: Interface Atomic Magnementioning

confidence: 68%

“…8, the plasmon structures are replaced by a broader band in the spectrum for region R2, which is known to be characteristic for the formation of an FeAl alloy. 31 The XPS results therefore show that the Pd, Pt, and Al are forming an alloy located at the interface between the Fe nanoislands and the capping layers. On the other hand, it is well established that Pd and Pt are magnetically polarized in contact with Fe, 11,[32][33][34] while the Al has no magnetic moment in contact with Fe.…”

Section: X-ray Magnetic Circular Dichroism: Interface Atomic Magnementioning

confidence: 93%

Interface alloying effects in the magnetic properties of Fe nanoislands capped with different materials

et al. 2008

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We show that Fe nanoislands capped with Al, Pd, and Pt protecting layers include an alloy at the interface with the capping layer, which explains the previously known capping layer dependence on the interparticle magnetic coupling. Vibrating sample magnetometry results, for instance, are evidencing a reduction in the magnetization measured under a magnetic field of 15 mT, which is larger in the case of the Al capping and which is due to the presence of a magnetically dead interface alloy. This reduction is also observed at the atomic level using x-ray magnetic circular dichroism measurements, showing a capping layer dependence of the Fe magnetic-moment reduction that is similar for the Pd and Pt capping, and stronger for the Al capping. The trend in the magnetic properties as a function of the capping layer is explained in the light of x-ray photoemission spectroscopy results that evidence the formation of alloys at the interface between the Fe nanoislands and the capping layers. The present results highlight the strong influence of interface alloying in systems of reduced dimensionality. In particular, it is shown that the magnetic properties are strongly affected at both the atomic and macroscopic level.

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X-ray photoelectron spectroscopic study of ordered stoichiometric FeAl fractured in situ

Cited by 20 publications

References 20 publications

Electronic structure of FeAl alloy studied by resonant photoemission spectroscopy and Ab initio calculations

Electronic structure of FeAl alloy studied by resonant photoemission spectroscopy and Ab initio calculations

Itinerant electrons, local moments, and magnetic correlations in the pnictide superconductors CeFeAsO1−xFxand Sr(Fe
Vilmercati
¹
,
Fedorov
²
,
Bondino
³

et al. 2012
Phys. Rev. B

Interface alloying effects in the magnetic properties of Fe nanoislands capped with different materials

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X-ray photoelectron spectroscopic study of ordered stoichiometric FeAl fractured in situ

Cited by 20 publications

References 20 publications

Electronic structure of FeAl alloy studied by resonant photoemission spectroscopy and Ab initio calculations

Electronic structure of FeAl alloy studied by resonant photoemission spectroscopy and Ab initio calculations

Itinerant electrons, local moments, and magnetic correlations in the pnictide superconductors CeFeAsO1−xFxand Sr(FeVilmercati1, Fedorov2, Bondino3 et al. 2012Phys. Rev. B

Interface alloying effects in the magnetic properties of Fe nanoislands capped with different materials

Contact Info

Product

Resources

About

Itinerant electrons, local moments, and magnetic correlations in the pnictide superconductors CeFeAsO1−xFxand Sr(Fe
Vilmercati
¹
,
Fedorov
²
,
Bondino
³

et al. 2012
Phys. Rev. B