Structure of epitaxial Fe films on MgO(100)

Lawler, J.F.; Schad, R.; Jordan, Scott; Kempen, H. van

doi:10.1016/s0304-8853(96)00515-x

Cited by 49 publications

(34 citation statements)

References 4 publications

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“…Scale factor was also taken as a fitting parameter. This model is in accordance with some earlier studies on thin Fe film on MgO using GISAXS or STM measurements [36,37], where shape of Fe islands in as-deposited film was found to be spherical. Up to a film thickness of 2.5 nm, this model gave a reasonably good fit.…”

Section: A Gisaxs Studysupporting

confidence: 93%

In situsmall-angle x-ray and nuclear resonant scattering study of the evolution of structural and magnetic properties of an Fe thin film on MgO (001)

Sharma

Gupta

et al. 2015

Phys. Rev. B

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Growth of magnetron sputtered Fe films on clean single crystalline MgO (001) substrate has been studied using in situ grazing incidence small angle x-ray scattering (GISAXS) and grazing incidence nuclear resonant scattering (GINRS) measurements. While GISAXS provides information about morphological changes, GINRS provides information about structural and magnetic properties, thus making it possible to correlate the evolution of magnetic properties with that of morphology and structure of the film. The film exhibits a Volmer-Weber type growth, with percolation transition occurring around 2 nm film thickness. Presence of a finite quadrupole splitting, as seen in GINRS measurements, suggests a significant distortion from cubic symmetry up to a film thickness of 3.5 nm, which can be attributed to hybridization between Fe 3d and O 2p orbitals at the interface as well as in-plane tensile strain induced as a result of coalescence of islands. Initially Fe islands exhibit superparamagnetic relaxation, while finite magnetic moment appears upon formation of macroscopic percolation islands. The film exhibits a weak perpendicular magnetic anisotropy (PMA), which vanishes concurrently with disappearance of structural distortion, suggesting that the observed PMA at least partly originates from inherent strain in the film. No presence of any known oxide of Fe was detected at the interface. More precise information about topological and magnetic structure of the interfaces between Fe and MgO layers is obtained using combined x-ray reflectivity and nuclear resonance reflectivity measurements on a 57 Fe/MgO multilayer. Measurements show that about two monolayers of Fe at the interface have a reduced hyperfine field, providing evidence for hybridization with O atoms, as predicted by theory.

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Section: A Gisaxs Studysupporting

confidence: 93%

In situsmall-angle x-ray and nuclear resonant scattering study of the evolution of structural and magnetic properties of an Fe thin film on MgO (001)

Sharma

Gupta

et al. 2015

Phys. Rev. B

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“…From AFM measurements we know that the typical size of the atomically flat MgO substrate terraces is about 1 µm which should yield ξ x (S) values ≥1 µm. Additionally, Scanning Tunneling Microscopy (STM) studies of single Fe films grown on MgO [26,27] suggest ξ x values of the order of 100 Å and h values around 0.6. The other parameter, ξ z , does not have such a pronounced influence on the q x dependence of the diffuse intensity.…”

Section: Resultsmentioning

confidence: 99%

Quantitative interface roughness analysis of Fe/Cr superlattices

Schad

Beliën

Verbanck

et al. 1998

Superlattices and Microstructures

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“…The Fe atoms are sitting above the O 2À sites on the MgO(1 0 0) surface [2,5]. First, round shaped islands of different sizes are formed at room temperature deposition [14,[17][18][19][20][21][22][23]. The epitaxially grown Fe films have a small contraction of the vertical lattice constant to compensate for the in plane expansion imposed by the lattice mismatch between MgO and Fe.…”

Section: Discussionmentioning

confidence: 99%