Assessment of MgO(100) and (111) substrate quality by X-ray diffraction

Madsen, Lynnette D.; Charavel, Rémy; Birch, Jens; Svedberg, Erik B.

doi:10.1016/s0022-0248(99)00533-3

Cited by 13 publications

(6 citation statements)

References 30 publications

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“…The 15-nm film has the lowest coercivity, but a higher field is needed to close the hysteresis loop than in the thicker films. We attribute this difference to variations of the film properties due to imperfections in the MgO substrates 16 for this particular film. The effects observed in the low-field hysteresis curve may also account for the rounding of the high-field hysteresis curve of the 15-nm-thick film.…”

Section: A Fe Filmsmentioning

confidence: 95%

Magnetic domain structures in submicron-size particles of epitaxial Fe (001) films: Shape anisotropy and thickness dependence

et al. 2002

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In this work the influence of shape anisotropy on the magnetic hysteresis and zero-field magnetic domain state of submicron-size particles of Fe was investigated. Arrays of particles having circular ͑diameter d c ϭ550 or 200 nm͒, rectangular ͑900 nm by 300 nm͒, or elliptical ͑450 nm by 150 nm͒ shape were prepared by electron lithography and ion-beam milling of epitaxial Fe ͑001͒ films of thicknesses tϭ50, 30, 15, and 10 nm. The samples were characterized by magnetization measurements and magnetic-force microscopy ͑MFM͒. All films have cubic anisotropy, for tϭ50, 30, and 15 nm with the same anisotropy constant as bulk Fe: K 1 ϭ(4.3Ϯ0.1)ϫ10 4 J m Ϫ3 . For tϭ10 nm the effective anisotropy is increased, K 1 ϭ5.7ϫ10 4 J m Ϫ3 , due to surface effects. The effects of the interplay between the magnotocrystalline and shape anisotropies are observed as the lateral extension of the films is decreased. The circular particles with d c ϭ550 nm have closed magnetic domain structures with a fourfold symmetry, compatible with the magnetocrystalline anisotropy, for all thicknesses. In the rectangular particles a gradual change is observed as the thickness decreases. For tϭ50 nm a diamond structure comprising three closed-domain substructures is formed in the demagnetized state. The rectangles with tϭ30 and 15 nm are multidomains with the number of closed substructures decreasing to 2 and 2 or 1, respectively. The thickness dependence of the domain structure and an accompanying change of character in the MFM contrast are explained by an increasing amount of Néel component in the domain walls with a width that increases with decreasing film thickness. The rectangles with tϭ10 nm are quasisingle domains, forming a flower state. The small circular particles (d c ϭ200 nm) and the elliptical ones, both with tϭ10 nm, are considered to be stable single domains in zero field. Judging from the hysteresis curves, magnetization reversal does not occur by coherent rotation in any of the particles.

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Section: A Fe Filmsmentioning

confidence: 95%

Magnetic domain structures in submicron-size particles of epitaxial Fe (001) films: Shape anisotropy and thickness dependence

et al. 2002

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“…In most studies, AlMgB 14 was prepared on Si substrates, while, for example, in thermoelectric devices, to avoid thermal and electrical leakage through the substrate, the device layer is preferred to be on the insulator. Therefore, deposition on lower thermal conductivity materials in comparison to Si, like Al 2 O 3 and MgO substrates [18][19][20] can be preferable for some applications. In this study, we synthesize ternary boride AlMgB 14 films by DC magnetron sputtering with a three-target magnetron sputtering system on Si (001), Al 2 O 3 (0001) and MgO (001) substrates at temperature range of 25-350 °C.…”

Section: Introductionmentioning

confidence: 99%

Structural and mechanical properties of amorphous AlMgB14 thin films deposited by DC magnetron sputtering on Si, Al2O3 and MgO substrates

et al. 2020

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AlMgB 14 coatings have been deposited by DC magnetron sputtering from elemental targets on Si (001), Al 2 O 3 (0001) and MgO (001) substrates at temperatures in the range of 25-350 °C. The structural and mechanical properties of AlMgB 14 films were characterized by X-ray diffraction, scanning electron microscopy, nanoindentation, and analyzed as a function of deposition conditions and substrate materials. The results show that all films are X-ray amorphous, and the mechanical properties of the deposited films depend on the substrate and growth temperature. AlMgB 14 thin films deposited at 350 °C are found to have smoother surfaces and containing more well-formed B 12 icosahedra than the films deposited at lower temperature, which consequently increase the hardness of the deposited films. The maximum hardness and Young's modulus of the as-deposited films are about 32.3 GPa and 310 GPa, respectively, for films deposited on Al 2 O 3 substrate at 350 °C.

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“…Rocking curves are presented in Fig. S2 along with substrate rocking curves for comparison; MgO substrates are known to possess low-angle grain boundaries and multiple peaks in ω space [30,58]. Skew-symmetric θ -2θ scans and ϕ scans of 111 reflections confirm epitaxy and an in-plane epitaxial relationship of J14[100]||MgO[100] (Fig.…”

Section: Appendix B: Structural Characterizationmentioning

confidence: 99%

Property and cation valence engineering in entropy-stabilized oxide thin films

Kotsonis

Meisenheimer

Miao

et al. 2020

Phys. Rev. Materials

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We present data for epitaxial thin films of the prototypical entropy-stabilized oxide (ESO), Mg 0.2 Ni 0.2 Co 0.2 Cu 0.2 Zn 0.2 O, that reveals a systematic trend in lattice parameter and properties as a function of substrate temperature during film growth with negligible changes in microstructure. A larger net Co valence in films grown at substrate temperatures below 350 °C results in a smaller lattice parameter, a smaller optical band gap, and stronger magnetic exchange bias. Observation of this phenomena suggests a complex interplay between thermodynamics and kinetics during ESO synthesis; specifically thermal history, oxygen chemical potential, and entropy. In addition to the compositional degrees of freedom available to ESO systems, subtle nuances in atomic structure at constant metallic element proportions can strongly influence properties, simultaneously complicating physical characterization and providing opportunities for property tuning and development.

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Assessment of MgO(100) and (111) substrate quality by X-ray diffraction

Cited by 13 publications

References 30 publications

Magnetic domain structures in submicron-size particles of epitaxial Fe (001) films: Shape anisotropy and thickness dependence

Magnetic domain structures in submicron-size particles of epitaxial Fe (001) films: Shape anisotropy and thickness dependence

Structural and mechanical properties of amorphous AlMgB14 thin films deposited by DC magnetron sputtering on Si, Al2O3 and MgO substrates

Property and cation valence engineering in entropy-stabilized oxide thin films

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