Modification of the magnetic properties of Co films grown on MgO (100) by treatment with NaOH solution

Liu, Hao-Liang; Hauffman, Tom; Herdewyn, Katrien; Terryn, Herman; Bael, M. J. Van; Haesendonck, Chris Van

doi:10.1103/physrevb.90.134414

Cited by 4 publications

(5 citation statements)

References 26 publications

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“…Among the oxides with this structure, MgO has been widely investigated. [6][7][8] In experiment, MgO thin¯lms are of interest as substrate for various thin metal¯lms such as Ag/MgO, 9 Fe/MgO, 10 Co/MgO, 11 Nb/MgO 12 etc. Many ferroelectric and high-temperature superconducting thin¯lms such as LiNbO 3 , 13 BaTiO 3 14 and YBa 2 Cu 3 O 7 , [15][16][17] etc.…”

Section: Introductionmentioning

confidence: 99%

ELECTRONIC STRUCTURES AND THE STABILITY OF MgO SURFACE: DENSITY FUNCTIONAL STUDY

et al. 2015

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The electronic structures and the stability of the low-index surface (001), (011) and (111) for MgO were investigated by¯rst-principles method based on density functional theory (DFT). We analyzed the stability of the MgO slab in equilibrium with an arbitrary oxygen environment. The density of states (DOS) and the band structures of MgO slabs were calculated and compared with those of the bulk MgO. Our calculation results reveal that the stabilities of the surface vary with the change of O chemical potential. In addition, the (001) and (011) surfaces are semiconductors, which are similar to that of the bulk MgO. However, the MgO(111) surface exhibits metallic property due to the e®ect of the surface states, which is di®erent from that of the bulk MgO.

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Section: Introductionmentioning

confidence: 99%

ELECTRONIC STRUCTURES AND THE STABILITY OF MgO SURFACE: DENSITY FUNCTIONAL STUDY

et al. 2015

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“…It was found that highest magnetic moment is expected for a normal spinel unit cell and the lowest for an inverse or disordered spinel structure . Extensive research of either magneto‐optical properties or optical properties of CCO, ZFO, CFO, and FFO has presented experimentally the deviation of the electronic structure from the one expected for the bulk material in both normal and inverse spinel structures . It is only recently that optical and magneto‐optical properties of ZFO and CFO films were compared to each other and a direct correlation between the lattice structure and the magneto‐optical response was investigated .…”

Section: Introductionmentioning

confidence: 99%

“…[6,9,16,46] Extensive research of either magneto-optical properties or optical properties of CCO, ZFO, CFO, and FFO has presented experimentally the deviation of the electronic structure from the one expected for the bulk material in both normal and inverse spinel structures. [9,11,14,21,23] It is only recently that optical and magneto-optical properties of ZFO and CFO films were compared to each other and a direct correlation between the lattice structure and the magnetooptical response was investigated. [8,17] However, for such a wide series of investigated materials, no such study was performed in dependence on the growth temperature as well as with regard to their electronic structure.…”

mentioning

confidence: 99%

Comparative study of optical and magneto‐optical properties of normal, disordered, and inverse spinel‐type oxides

Zviagin

Richter

Böntgen

et al. 2015

Physica Status Solidi (b)

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Co3O4, ZnFe2O4, CoFe2O4, ZnCo2O4, and Fe3O4 thin films were fabricated by pulsed laser deposition at high and low temperatures resulting in crystalline single‐phase normal, inverse, as well as disordered spinel oxide thin films with smooth surface morphology. The dielectric function, determined by spectroscopic ellipsometry in a wide spectral range from 0.5 to 8.5 eV, is compared with the magneto‐optical response of the dielectric tensor, investigated by magneto‐optical Kerr effect spectroscopy in the spectral range from 1.7 to 5.5 eV with an applied magnetic field of 1.7 T. Crystal field, inter‐valence, and inter‐sublattice charge transfer transitions, and transitions from O2p to metal cation 3d or 4s bands are identified in both the principal diagonal elements and the magneto‐optically active off‐diagonal elements of the dielectric tensor. Depending on the degree of cation disorder, resulting in local symmetry distortion, the magneto‐optical response is found to be strongest for high crystal quality inverse spinels and for disordered normal spinel structure, contrary to the first principle studies of CoFe2O4 and ZnFe2O4. The results presented provide a basis for deeper understanding of light–matter interaction in this material system that is of vital importance for device‐related phenomena and engineering.

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“…For the hysteresis loop along the easy axis (ϕ = °45 ), the AMR is almost constant, except for two smaller peaks, reflecting the fact that domain wall motion dominates the magnetization reversals. Our previous measurements at room temper ature of the magneto-optical Kerr effect in similar epitaxial CoO/Co films revealed that the magnetization reversal can be well described in terms of two-jump domain wall motion [39,40]. For the hysteresis loop along a hard axis (ϕ = 0) magnetization rotation is clearly present and even makes the second jump invisible [41].…”

Section: Resultsmentioning

confidence: 92%

“…1 12 0 hcp structure on MgO (0 0 1) [34,38]. The magnetic anisotropy is characterized by magneto-optical Kerr magnetometry at room temper ature, showing a four-fold symmetry due to magnetocrystalline anisotropy with easy axes along the ⟨ ⟩ 1 1 0 directions and hard axes along the ⟨ ⟩ 1 0 0 directions of the substrate [39]. We rely on the anisotropic magnetoresistance (AMR) effect to monitor magnetization reversal [8,32,33].…”

Section: Methodsmentioning

confidence: 99%

Interplay between magnetocrystalline anisotropy and exchange bias in epitaxial CoO/Co films

Liu

Brems

Zeng

et al. 2016

J. Phys.: Condens. Matter

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The interplay between magnetocrystalline anisotropy and exchange bias is investigated in CoO/Co bilayer films, which are grown epitaxially on MgO (0 0 1), by magnetization reversal measurements based on the anisotropic magnetoresistance (AMR) effect. While an asymmetric magnetization reversal survives after training for cooling field (CF) along the hard axis, the magnetization reversal becomes symmetric and is dominated in both branches of the hysteresis loop by domain wall motion before and after training for CF along the easy axis. When performing an in-plane hysteresis loop perpendicular to the CF, the hysteresis loop along the easy axis becomes asymmetric: magnetization rotation dominates in the ascending branch, while there is a larger contribution of domain wall motion in the descending branch. Furthermore, the azimuthal angular dependence of the AMR shows two minima after performing a perpendicular hysteresis loop, instead of only one minimum after training. Relying on the extended Fulcomer and Charap model, these effects can be related to an increased deviation of the average uncompensated antiferromagnetic magnetization from the CF direction. This model provides a consistent interpretation of training and asymmetry of the magnetization reversal for epitaxial films with pronounced magnetocrystalline anisotropy as well as for the previously investigated polycrystalline films.

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Modification of the magnetic properties of Co films grown on MgO (100) by treatment with NaOH solution

Cited by 4 publications

References 26 publications

ELECTRONIC STRUCTURES AND THE STABILITY OF MgO SURFACE: DENSITY FUNCTIONAL STUDY

ELECTRONIC STRUCTURES AND THE STABILITY OF MgO SURFACE: DENSITY FUNCTIONAL STUDY

Comparative study of optical and magneto‐optical properties of normal, disordered, and inverse spinel‐type oxides

Interplay between magnetocrystalline anisotropy and exchange bias in epitaxial CoO/Co films

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