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

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

doi:10.1109/tmag.2013.2276094

Cited by 3 publications

(11 citation statements)

References 28 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%

“…Iron atoms were evaporated from a well-collimated evaporator where high purity (99.997%) Fe rods were contained in a crucible. The deposition rate was determined by means of the ratio of the intensity of the Fe and Ir Auger signals and was further checked by oscillations of the specular beam of LEED 10 , 39 . The surface of the iridium single crystal was cleaned after each run.…”

Section: Methodsmentioning

confidence: 99%

“…The magnetic field was applied in-plane and perpendicular to the surface of the sample in the longitudinal and polar configurations, respectively. Experimental details and various components have been described in detail elsewhere 8 – 10 , 39 .…”

Section: Methodsmentioning

confidence: 99%

“…The Fe monolayer tends to be antiferromagnetic for iron on Ir(100) with a relaxed geometry, while an unrelaxed Fe/Ir(001) sample exhibits a ferromagnetic ground state 36 . 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 .…”

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

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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“…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%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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

Sci Rep

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Magnetic behavior of metastable Fe films grown on Ir(1 1 1)

Calloni¹,

Cozzi²,

Jagadeesh³

et al. 2017

J. Phys.: Condens. Matter

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We investigated the growth of ultra-thin Fe films on Ir(111) by means of in-situ low energy electron diffraction and spin-resolved photoemission techniques. We observe a (1x1) diffraction pattern, characteristic of the fcc substrate, below 4 monolayers (ML). Then, a complex superstructure starts to develop, compatible with the formation of bcc-like Fe domains aligned with the substrate according to the Kourdjumov-Sachs orientation relationships. The analysis of the diffraction patterns reveals a progressive evolution towards a fully relaxed bcc lattice, characteristic of bulk Fe. Both photoemission (filled states) and inverse photoemission (empty states) results show characteristic features related to the contribution of the Fe layer, evolving towards those observed on the Fe (110) bcc surface. Spin resolution allows to detect a spectral polarization above 4 ML corresponding to the formation of bcc Fe, which gradually increases indicating the formation of an in-plane magnetized ferromagnetic layer in thick films. No in-plane net magnetization is detected in thinner films, independent of the sample temperature down to 30 K. Following recent investigations on the Fe/Ir(111) system with microscopy techniques, we link this observation to the stabilization of a non collinear spin structure yielding an overall nil magnetization.

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