Ag-induced spin-reorientation transition of ultrathin Fe films on Pt(111)

Chen, Y. J.; Kuo, Martin; Shern, Ching-Song

doi:10.1063/1.2956678

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…The investigations of well-controlled transition metals on metallic substrates are an important topic in material science because of their scientific significance as well as technological applications, especially in surface alloying, microelectronics, enhancing catalytic activities, and spintronics. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] For instance, adsorption of oxygen on Ag/Pt(111) surface alloy leads to an attractive interaction between adsorbed oxygen atoms while oxygen adsorption is blocked on Ag sites. 1 By optimizing the Pt surface content or the Pt film thickness, unambiguous demonstrations of bimetallic surfaces reaching activities well in excess of that of Pt(111) have been made.…”

mentioning

confidence: 99%

Layered structure and related magnetic properties for annealed Fe/Ir(111) ultrathin films

Jiang

Chen

Hsieh

et al. 2015

Journal of Applied Physics

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After annealing treatments for fcc-Fe/Ir(111) below 600 K, the surface layers remain pseudomorphic. The Ir(111) substrate plays an important role on the expanded Fe lattice. At temperatures between 750 and 800 K, the surface composition shows a stable state and a c(2 × 4) structure is observed. We discover a layered structure composed of some Fe atoms on the top of a Fe0.5Ir0.5 interfacial alloy supported on the Ir(111) substrate. The competition between the negative formation heat of Fe0.5Ir0.5 and surface free energy of Fe causes the formation of layered structure. The existence of ferromagnetic dead layer coincides with the formation of fcc-Fe for ultrathin Fe on Fe0.5Ir0.5/Ir(111). For Fe films thicker than three monolayers, the linear increase of the Kerr intensity versus the Fe coverage is related to the growing of bcc-Fe on the surface where the Fe layer is incoherent to the underlying Fe0.5Ir0.5/Ir(111). These results emphasize the importance of the substrate induced strain and layered structure of Fe/Fe0.5Ir0.5/Ir(111) on the magnetic properties and provide valuable information for future applications.

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confidence: 99%

Layered structure and related magnetic properties for annealed Fe/Ir(111) ultrathin films

Jiang

Chen

Hsieh

et al. 2015

Journal of Applied Physics

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“…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 . In terms of introducing heterogeneous interfaces, the stabilization of crystallographic phases is critical to a viable strategy for the development of new materials with novel characteristics 17 – 25 .…”

Section: Introductionmentioning

confidence: 99%

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

Hsieh

Jiang

Chen

et al. 2021

Sci Rep

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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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“…Multilayered systems of magnetic and non-magnetic metallic layers, which we have studied, are in particular interesting for their technological applications in the area of data storage and processing [9][10][11] . It has recently been shown that capping a ferromagnetic thin film with a noble metal can influence the magnetic properties [12][13][14][15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

Growth and structure of Ag on bilayer Co nanoislands on Cu(111)

Bork

Onsgaard²,

Diekhöner³

2010

J. Phys.: Condens. Matter

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We have studied the growth of Ag on bilayer high Co nanoislands on Cu(111) using scanning tunneling microscopy. Noble metal capping of magnetic nanostructures is known to influence the magnetism and knowledge of the growth is therefore important. We find that Ag preferentially nucleates on the Co nanoislands, initially leaving the free Cu sites clean. Furthermore we observe that those Co islands which are capped with Ag are almost completely capped, thus making a perfect multilayered system of Ag/Co/Cu(111). We observe a (9 × 9) reconstruction of the Ag overlayer on Co/Cu(111).

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Ag-induced spin-reorientation transition of ultrathin Fe films on Pt(111)

Cited by 8 publications

References 19 publications

Layered structure and related magnetic properties for annealed Fe/Ir(111) ultrathin films

Layered structure and related magnetic properties for annealed Fe/Ir(111) ultrathin films

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

Growth and structure of Ag on bilayer Co nanoislands on Cu(111)

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