Growth and magnetic properties of ultrathin Fe films on Pt(111)

Chen, Y. J.; Ho, H. Y.; Tseng, Ching‐Chun; Shern, Ching-Song

doi:10.1016/j.susc.2007.04.121

Cited by 10 publications

(11 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(111) (imaged at 300 K); (B) FeO/Pt(111) exposed to ∼0.5 ML of 1-octanol at 160 K (imaged at 160 K); (C) surface (B) after annealing to ∼800 K (imaged at 300 K); (D) surface (C) after additional exposure to ∼0.5 ML of 1-octanol at 160 K and annealing to ∼800 K (imaged at 300 K). annealed to temperatures higher than 800 K to be efficiently dissolved in the Pt(111) bulk, 40 and (2) our Kr TPD experiments clearly show that FeO(111) exposed to alcohols and annealed only to 700 K (data not shown) instead of 1000 K (Figure 3) exhibits the Fe/Pt(111)-related Kr peak. Therefore, it is likely that after the desorption of all volatile C-and O-containing products (see next section) these areas are metallic Fe.…”

Section: Changes In the Feo(111) Film Morphology Upon Repeated Alcohomentioning

confidence: 56%

Reactivity of FeO(111)/Pt(111) with Alcohols

et al. 2009

View full text Add to dashboard Cite

We report on the reactivity of a FeO(111) monolayer grown on Pt(111) toward aliphatic alcohols. Using a combination of temperature-programmed desorption, infrared reflection-absorption spectroscopy, and scanning tunneling microscopy techniques, we show that the alcohols dissociate primarily at FeO(111) step edges and their oxidation leads to the removal of the FeO(111) film. Upon annealing, FeO(111) lattice oxygen is incorporated into the reaction products, and reduced iron left behind dissolves into the underlying Pt (111) substrate. Ethanol is employed in a more detailed spectroscopic study to follow the reaction products and surface intermediates as the removal of FeO(111) proceeds. The ethoxy species formed upon dissociative adsorption of ethanol at the FeO(111) step edges undergo partial oxidation to acetaldehyde and a complete oxidation to CO and H 2 O. Other products, CH 4 and H 2 , associated with the reactions occurring on Pt (111) are also observed as the bare Pt(111) surface appears. A similar etching process was also observed for n-decane.

show abstract

Section: Changes In the Feo(111) Film Morphology Upon Repeated Alcohomentioning

confidence: 56%

Reactivity of FeO(111)/Pt(111) with Alcohols

et al. 2009

View full text Add to dashboard Cite

show abstract

“…In the present Fe-O/Fe films, a decreased J S may result from the presence of ferrimagnetic γ-Fe 2 O 3 (J S = 0.48 T) and Fe 3 O 4 (J S = 0.6 T) in the native oxide layer. 39,40 In addition, roughness induced anisotropy contributions 36 and a perpendicular interface anisotropy at the Fe/Pt interface 37,38 can compete with shape anisotropy in the present films and lead to the reduction of H S . All three origins are expected to be more dominant in thinner films, being consistent with the observed reduction of H S when decreasing the film thickness ( Fig.…”

mentioning

confidence: 87%

“…A deviation from shape anisotropy has already been reported for various Fe films. [36][37][38][39] As origin, a decreased J S and/or additional anisotropy contributions are discussed. In the present Fe-O/Fe films, a decreased J S may result from the presence of ferrimagnetic γ-Fe 2 O 3 (J S = 0.48 T) and Fe 3 O 4 (J S = 0.6 T) in the native oxide layer.…”

mentioning

confidence: 98%

Research Update: Magnetoionic control of magnetization and anisotropy in layered oxide/metal heterostructures

et al. 2016

View full text Add to dashboard Cite

Electric field control of magnetization and anisotropy in layered structures with perpendicular magnetic anisotropy is expected to increase the versatility of spintronic devices. As a model system for reversible voltage induced changes of magnetism by magnetoionic effects, we present several oxide/metal heterostructures polarized in an electrolyte. Room temperature magnetization of Fe-O/Fe layers can be changed by 64% when applying only a few volts in 1M KOH. In a next step, the bottom interface of the in-plane magnetized Fe layer is functionalized by an L10 FePt(001) underlayer exhibiting perpendicular magnetic anisotropy. During subsequent electrocrystallization and electrooxidation, well defined epitaxial Fe3O4/Fe/FePt heterostructures evolve. The application of different voltages leads to a thickness change of the Fe layer sandwiched between Fe-O and FePt. At the point of transition between rigid magnet and exchange spring magnet regime for the Fe/FePt bilayer, this induces a large variation of magnetic anisotropy.

show abstract

“…A phase transition of a superparamagnetic phase can be induced by controlling the thickness of the ultrathin ferromagnetic layers of Co/Ir(111) and the larger total magnetic moments as compared to nanoparticles that pave the way for the further development of strategies for fabricating biosensors on a microchip 8 . After an annealing treatment for a 5 ML Fe/Pt(111) layer to form a surface alloy, the coercive force is greatly enhanced by as much as 1100%, and the resulting magnetic properties are strongly related to the diffusion of Fe atoms into the Pt(111) substrate 14 . A spin reorientation transition was observed for Fe/Pt(111) ultrathin films by introducing a Ag overlayer as thin as 1 ML 15 .…”

Section: Introductionmentioning

confidence: 99%

Strain driven phase transition and mechanism for Fe/Ir(111) films

Hsieh

Jiang

Chen

et al. 2021

Sci Rep

View full text Add to dashboard Cite

By way of introducing heterogeneous interfaces, the stabilization of crystallographic phases is critical to a viable strategy for developing materials with novel characteristics, such as occurrence of new structure phase, anomalous enhancement in magnetic moment, enhancement of efficiency as nanoportals. Because of the different lattice structures at the interface, heterogeneous interfaces serve as a platform for controlling pseudomorphic growth, nanostructure evolution and formation of strained clusters. However, our knowledge related to the strain accumulation phenomenon in ultrathin Fe layers on face-centered cubic (fcc) substrates remains limited. For Fe deposited on Ir(111), here we found the existence of strain accumulation at the interface and demonstrate a strain driven phase transition in which fcc-Fe is transformed to a bcc phase. By substituting the bulk modulus and the shear modulus and the experimental results of lattice parameters in cubic geometry, we obtain the strain energy density for different Fe thicknesses. A limited distortion mechanism is proposed for correlating the increasing interfacial strain energy, the surface energy, and a critical thickness. The calculation shows that the strained layers undergo a phase transition to the bulk structure above the critical thickness. The results are well consistent with experimental measurements. The strain driven phase transition and mechanism presented herein provide a fundamental understanding of strain accumulation at the bcc/fcc interface.

show abstract

Growth and magnetic properties of ultrathin Fe films on Pt(111)

Cited by 10 publications

References 14 publications

Reactivity of FeO(111)/Pt(111) with Alcohols

Reactivity of FeO(111)/Pt(111) with Alcohols

Research Update: Magnetoionic control of magnetization and anisotropy in layered oxide/metal heterostructures

Strain driven phase transition and mechanism for Fe/Ir(111) films

Contact Info

Product

Resources

About