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

Jiang, Pei; Chen, Wei Hsiang; Hsieh, Chen Yuan; Tsay, Jyh-Jong

doi:10.1063/1.4919123

Cited by 2 publications

(4 citation statements)

References 26 publications

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“…For Fe/Ir(111) thinner than 3 ML, the same p(1 × 1) structure is observed (Fig. 1 b) using LEED technique showing pseudomorphic growth of Fe films 9 , 10 . From Fig.…”

Section: Resultssupporting

confidence: 69%

“…1 b). The additional spots can be identified to be related to the bcc(110) arrangement of Fe atoms in Kurdjumov–Sachs (KS) orientation of bcc(110)/fcc(111) systems 9 , 10 . The KS model is a special case for the one-dimensional matching between bcc(110) and fcc(111) lattices where the bcc[ 11] direction is parallel to the fcc[10 ] direction.…”

Section: Resultsmentioning

confidence: 99%

“…For thicker films with a bcc-Fe structure, the interlayer distance decreases slightly from 0.206 to 0.205 nm. From the literature, the in-plane lattice parameter for Ir(111) is =0.272 nm and this value can be used in the further analyses 9 , 10 . From the corresponding LEED patterns, the in-plane lattice parameters of fcc(111)-Fe and bcc(110)-Fe for different thickness regimes are also summarized in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…As the Fe thickness increases for Fe/Ir(111), the pseudomorphic growth of Fe films was observed followed by the bcc(110) arrangement of Fe atoms into a Kurdjumov–Sachs orientation 10 , 11 . After the annealing of fcc-Fe/Ir(111) at high temperatures, a layered structure composed of some Fe atoms on the top of a Fe 0.5 Ir 0.5 interfacial alloy is formed, which can be attributed to competition between the negative heat of formation of Fe 0.5 Ir 0.5 and the surface free energy of Fe 9 . Recent research studies regarding the Dzyaloshinskii–Moriya interaction (DMI) for Fe/Ir(111) show the formation of magnetic textures consisting of chiral spin-spirals and skyrmions 37 , 38 .…”

Section: Introductionmentioning

confidence: 99%

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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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“…For Fe/Ir(111) thinner than 3 ML, the same p(1 × 1) structure is observed (Fig. 1 b) using LEED technique showing pseudomorphic growth of Fe films 9 , 10 . From Fig.…”

Section: Resultssupporting

confidence: 69%