Effects of interfacial structure on the magnetic properties of ultrathin Fe/Pt(111) films with Ag buffer layer

Chen, Yao Jung; Chang, Chi Ching; Ho, H. Y.; Tsay, Jyh-Jong

doi:10.1016/j.tsf.2011.03.065

Cited by 9 publications

(9 citation statements)

References 23 publications

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“…LEED has been used to investigate the structure of surface layers while the interlayer distance of the subsurface region can be determined from the I-V profile of the specular beam [7], [20]. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…For instance, strong surface photoexcitation interferes with a Rashba contribution to yield a pronounced circular dichroic effect for a Bi/Ag surface alloy prepared on a thin Ag film [6]. On the top of Ag-Pt surface alloy, the Curie temperature of ultrathin Fe films is greatly enhanced to be above room temperature [7]. Silver grows in a Stranski-Krastanov mode on Ni(111) with a two-monolayer-thick (2-ML-thick) wetting layer which takes on a reconstruction below 700 K and a reconstruction at higher temperatures [9].…”

Section: Introductionmentioning

confidence: 99%

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Structure Related Magnetic Dead Layer for Ultrathin Fe/Ir(111) Films

et al. 2014

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Magnetic properties and surface structure of ultrathin Fe/Ir(111) films have been investigated using the surface magneto-optic Kerr effect and low-energy electron diffraction. Layer-by-layer growth of Fe/Ir(111) is observed for the first three monolayers at room temperature. For Fe thinner than three monolayers, pseudomorphic growth of Fe films is observed. The layer distance is close to that of fcc(111) Fe. For Fe thicker than three monolayers, the surface structure can be identified to be related to the bcc(110) arrangement of Fe atoms in Kurdjumov-Sachs orientation. As the Fe thickness increases, the linear increase of the Kerr intensity is observed. The Kerr intensity comes from the bcc-Fe and a thin magnetic dead layer is observed at the interface.Index Terms-Fcc-Fe, iridium, iron, magneto-optic Kerr effect.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure Related Magnetic Dead Layer for Ultrathin Fe/Ir(111) Films

et al. 2014

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“…TEM of a cross-section for both samples after 3 days of reaction evidence thick body-centered cubic ( bcc ) Fe columnar films above the Pt layer of around 80 nm for Pt(111) (Figure c) and 40 nm for Pt(001) (Figure d), suggesting the merging of the nanostructures toward a Fe film. The XRD θ–2θ diffractograms show that Fe grows mainly along bcc Fe(110) on Pt(111) (Figure e) and along bcc Fe(001) on Pt(001) (Figure f), as observed in thin films elaborated by classical vapor-phase methods. , The epitaxial growth of Fe on both substrates is illustrated by φ-scan diagrams on Fe reflections (insets in Figure e, f). Detailed information on the structure and the epitaxial relationships are given in Figure S19.…”

Section: Resultsmentioning

confidence: 82%

“…6f), as observed in thin films elaborated by classical vapour-phase methods. 51,52 The epitaxial growth of Fe on both substrates is illustrated by -scan diagrams on Fe reflections (insets in Fig. 6e, f).…”

Section: Co Decomposition On Cu(001)mentioning

confidence: 99%

Oriented Metallic Nano-Objects on Crystalline Surfaces by Solution Epitaxial Growth

et al. 2015

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Chemical methods offer the possibility to synthesize a large panel of nanostructures of various materials with promising properties. One of the main limitations to a mass market development of nanostructure based devices is the integration at a moderate cost of nano-objects into smart architectures. Here we develop a general approach by adapting the seed-mediated solution phase synthesis of nanocrystals in order to directly grow them on crystalline thin films. Using a Co precursor, single-crystalline Co nanowires are directly grown on metallic films and present different spatial orientations depending on the crystalline symmetry of the film used as a 2D seed for Co nucleation. Using films exposing 6-fold symmetry surfaces such as Pt(111), Au(111), and Co(0001), the Co heterogeneous nucleation and epitaxial growth leads to vertical nanowires self-organized in dense and large scale arrays. On the other hand, using films presenting 4-fold symmetry surfaces such as Pt(001) and Cu(001), the Co growth leads to slanted wires in discrete directions. The generality of the concept is demonstrated with the use of a Fe precursor which results in Fe nanostructures on metallic films with different growth orientations which depend on the 6-fold/4-fold symmetry of the film. This approach of solution epitaxial growth combines the advantages of chemistry in solution in producing shape-controlled and monodisperse metallic nanocrystals, and of seeded growth on an ad hoc metallic film that efficiently controls orientation through epitaxy. It opens attractive opportunities for the integration of nanocrystals in planar devices.

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“…The phenomenon of the formation of coherent regions followed by island growth for Fe/Pt(111) is similar to that of Fe/Ir(111). Our previously reported LEED data for 2 ML Fe/Pt(111) showed that the in-plane lattice parameter and interlayer distance are 2.78 Å and 2.07 Å, respectively 49 . Substituting the values for the layered distance and in-plane lattice parameter into Eqs.…”

Section: Resultsmentioning

confidence: 91%

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

Hsieh

Jiang

Chen

et al. 2021

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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.

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Effects of interfacial structure on the magnetic properties of ultrathin Fe/Pt(111) films with Ag buffer layer

Cited by 9 publications

References 23 publications

Structure Related Magnetic Dead Layer for Ultrathin Fe/Ir(111) Films

Structure Related Magnetic Dead Layer for Ultrathin Fe/Ir(111) Films

Oriented Metallic Nano-Objects on Crystalline Surfaces by Solution Epitaxial Growth

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

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