Structural investigation and magnetic properties of oxygen adsorption on ultrathin Fe(110) film

Nishihara, Koutaro; Nomitsu, Tatsushi; Nakagawa, Takeshi; Mizuno, Seigi

doi:10.1016/j.susc.2019.03.001

Cited by 4 publications

(4 citation statements)

References 26 publications

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“…Explanation 3. The change in the magnetic moments on the surface atoms of the catalyst and the adsorbate due to chemisorption can be investigated by several techniques based on spin-polarized electrons: for example, spin-polarized photoemission studies [82], spin-resolved inverse photoemission spectroscopy [78], spin-polarized inverse photoelectron spectroscopy (SPIPES) [83], spin-polarised Auger electron spectroscopy (SPAES) [80], and spin-polarized secondary electron microscopy (SP-SEM) [84]. A reduction in the magnetic moment(s) of 3d-metal atoms on the surface is generally reported as the result of the adsorption of molecules over the ferromagnetic surface [78,79].…”

Section: Experimental Evidence On Magnetism-covalent Bonding Interpla...mentioning

confidence: 99%

Experimental Evidences on Magnetism-Covalent Bonding Interplay in Structural Properties of Solids and during Chemisorption

Biz,

Gracia,

Fianchini

2024

IJMS

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Valence electrons are one of the main players in solid catalysts and in catalytic reactions, since they are involved in several correlated phenomena like chemical bonding, magnetism, chemisorption, and bond activation. This is particularly true in the case of solid catalysts containing d-transition metals, which exhibit a wide range of magnetic phenomena, from paramagnetism to collective behaviour. Indeed, the electrons of the outer d-shells are, on one hand, involved in the formation of bonds within the structure of a catalyst and on its surface, and, on the other, they are accountable for the magnetic properties of the material. For this reason, the relationship between magnetism and heterogeneous catalysis has been a source of great interest since the mid-20th century. The subject has gained a lot of attention in the last decade, thanks to the orbital engineering of quantum spin–exchange interactions and to the widespread application of external magnetic fields as boosting tools in several catalytic reactions. The topic is discussed here through experimental examples and evidences of the interplay between magnetism and covalent bonding in the structure of solids and during the chemisorption process. Covalent bonding is discussed since it represents one of the strongest contributions to bonds encountered in materials.

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Section: Experimental Evidence On Magnetism-covalent Bonding Interpla...mentioning

confidence: 99%

Experimental Evidences on Magnetism-Covalent Bonding Interplay in Structural Properties of Solids and during Chemisorption

Biz,

Gracia,

Fianchini

2024

IJMS

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“…Koutaro Nishihara et al investigated the oxygen-induced surface structures on the Fe(110) layer and found two chemisorbed LEED structures, p(2×2) and p(3×2). Due to steric repulsion, oxygen was found to move from long bridge sites in the case of the p(2×2) structure to threefold hollow sites in the case of the p(3×2) structure as oxygen coverage increases [24]. Aside from oxygen adsorption on Fe(110), co-adsorption of K with O has also been attempted on the Fe(110) surface, where an ordered c(4×2) LEED structure with oxygen coverage of 0.5 and potassium coverage of 0.28 was formed [25].…”

Section: Introductionmentioning

confidence: 99%

LEED I(E) analysis of pseudomorphic Fe(111) monolayer on Ru(0001) surface and oxygen adsorption structure

Banik¹,

Nagamatsu²,

Jimba³

et al. 2022

Proceedings of International Exchange and Innovation Conference on Engineering &Amp; Sciences (IEICES)

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Herein we report the atomic model of pseudomorphic Fe monolayer on Ru(0001) surface analyzed by low energy electron diffraction (LEED) followed by the formation of c(4×2) structure upon exposure to oxygen. After deposition of the Fe overlayer on Ru(0001) surface at room temperature, the prepared surface was exposed to molecular oxygen (O2). When 2 Langmuir of O2 is introduced at room temperature on the prepared Fe(111)/Ru(0001) surface, the pseudomorphic p(1×1) structure of the Fe monolayer on the Ru(0001) surface changes to c(4×2) structure.

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“…[10] However, the micro-pictures of oxygen atoms adsorbing on the surfaces and migrating into the bulk in high oxygen concentration and irradiation environments cannot be observed by these experiments at the initial oxidation stage. Some theoretical simulations have been investigated to explore the formation of oxidation, [11][12][13][14][15][16][17] such as adsorption properties of oxygen on the body-centered-cubic (bcc)-Fe surfaces and the solution and diffusion of oxygen in bcc-Fe bulk. Based on density functional theory, people found that oxygen molecules (O 2 ) dissociate firstly, then energetically adsorb at the hollow position on the Fe(100) and longbridge position on Fe(110) surface.…”

Section: Introductionmentioning

confidence: 99%

“…The adsorption depends on the coverage of oxygen atoms and alloying atoms on the surfaces. [14,18,19] In the bulk, oxygen atoms prefer to solute at octahedral interstitial sites (OCT) of the Fe lattice [15,16] and diffuse quickly to the next OCT site with the energy barrier of 0.54 eV. [17] However, they are easily trapped by vacancy defects and grain boundaries, which also slow down the diffusion of oxygen.…”

Section: Introductionmentioning

confidence: 99%

Effects of oxygen concentration and irradiation defects on the oxidation corrosion of body-centered-cubic iron surfaces: A first-principles study

Ye¹,

Lei²,

Zhang³

et al. 2022

Chinese Phys. B

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Oxidation corrosion of steels usually occurs in contact with the oxygen-contained environment, which is accelerated by high oxygen concentration and irradiation. The oxidation mechanism of steels is investigated by the adsorption/solution of oxygen atoms on/under body-centered-cubic (bcc) iron surfaces, and diffusion of oxygen atoms on the surface and in the near-surface region. Energetic results indicate that oxygen atoms prefer to adsorb at hollow and long-bridge positions on the Fe(100) and (110) surfaces, respectively. As the coverage of oxygen atoms increases, oxygen atoms would repel each other and gradually dissolve in the near-surface and bulk region. As vacancies exist, oxygen atoms are attracted by vacancies, especially in the near-surface and bulk region. Dynamic results indicate that the diffusion of O atoms on surfaces is easier than that into near-surface, which is affected by oxygen coverage and vacancies. Moreover, the effects of oxygen concentration and irradiation on oxygen density in the near-surface and bulk region are estimated by the McLean’s model with a simple hypothesis.

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Structural investigation and magnetic properties of oxygen adsorption on ultrathin Fe(110) film

Cited by 4 publications

References 26 publications

Experimental Evidences on Magnetism-Covalent Bonding Interplay in Structural Properties of Solids and during Chemisorption

Experimental Evidences on Magnetism-Covalent Bonding Interplay in Structural Properties of Solids and during Chemisorption

LEED I(E) analysis of pseudomorphic Fe(111) monolayer on Ru(0001) surface and oxygen adsorption structure

Effects of oxygen concentration and irradiation defects on the oxidation corrosion of body-centered-cubic iron surfaces: A first-principles study

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