Preparation, structure, and electronic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>films on the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:

Fonin, Mikhail; Dedkov, Yuriy; Mayer, J.; Rüdiger, Ulrich; Güntherodt, G.

doi:10.1103/physrevb.68.045414

Cited by 25 publications

(22 citation statements)

References 38 publications

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“…The surface cleanliness has been monitored by valence-band as well as core-level photoemission and STM. with earlier experiments, 11,12,22 (ii) the hexagonal ͑2 ϫ 2͒ LEED patterns indicate the formation of a Fe 3 O 4 ͑111͒ surface, 12,14,16,21,23 and (iii) the defect free STM images of the Fe 3 O 4 ͑111͒ films exhibit a hexagonal structure with ͑6.0± 0.1͒ Å periodicity. These data confirm the high bulk and surface quality of the investigated Fe 3 O 4 ͑111͒ films.…”

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confidence: 67%

“…The same preparation procedure of high-quality ferromagnetic Fe 3 O 4 ͑111͒ thin films was used successfully in earlier works. 16,21 The high degree of crystalline order of the epitaxial Fe 3 O 4 ͑111͒ films obtained in our experiments has been checked by LEED and STM. The surface cleanliness has been monitored by valence-band as well as core-level photoemission and STM.…”

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Electronic structure of theFe3O4(111)surface

et al. 2004

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The surface electronic band structure of thin, well-ordered epitaxial Fe 3 O 4 ͑111͒ films has been investigated at room temperature by means of angle-resolved photoelectron spectroscopy using synchrotron radiation. In the ⌫ − M direction of the Fe 3 O 4 ͑111͒ surface Brillouin zone (SBZ), two types of dispersion states originating from a periodic multilayered structure of iron and oxygen ions, in which Fe 2+ and Fe 3+ cations are incorporated into the close-packed fcc oxygen sublattice, were identified. Oxygen 2p-derived states at binding energies between 2.5 and 8 eV follow a strong, monotonic dispersion extending from ⌫ to M of the oxygen-sublattice originating SBZ. On the other hand, the iron 3d-derived states near the Fermi energy show a weak dispersion with a period half of the ⌫ − M distance of the latter. The surface electronic band structure of the Fe 3 O 4 ͑111͒ film measured with photoemission is described as composed from matrix-element governed contributions of the oxygen and the iron sublattices which are related to the different symmetries of their SBZs. Oxides with strong electronic correlations exhibit various interesting physical phenomena such as metal-insulator phase transitions, 1,2 superconductivity, 3 and colossal magnetoresistance. [4][5][6] The nature of the electronic states and their influence on the physical properties are of detrimental importance. Magnetite ͑Fe 3 O 4 ͒ is an intensively studied, strongly correlated transition metal oxide, which is ferrimagnetically ordered below a relatively high transition temperature ͑T C = 851 K͒. 7 This material has recently received renewed attention because of its potential application in spintronics related to its high spin polarization due to the half-metallic ferromagnetic electronic structure. 8-10The electronic band structure of Fe 3 O 4 films has been extensively investigated by means of x-ray magnetic circular dichroism, 11,12 ultraviolet photoelectron spectroscopy, 13,14 as well as spin-and angle-resolved photoelectron spectroscopy. [14][15][16] However, the interpretation of the valence-band photoemission spectra of Fe 3 O 4 has been a matter of debate since decades. 13,[15][16][17] Previous photoemission studies were mostly interpreted on the basis of the ligand-field theory, in which the localized 3d cation levels, split further by the oxygen ligand field, were found responsible for the spectral features rather than the recently observed dispersing, band-like 3d states. 13,16 Further theoretical studies at the time found that it was necessary to include configuration interactions within the 3d multiplet as well as charge transfer between the 3d and the ligand orbitals to improve the agreement with experiment and to account for the satellite features observed in photoemission. [17][18][19] The recent investigations, 13,16 however, showed that theoretically calculated band dispersions 8-10 should be taken into account for the interpretation of photoelecton spectra of Fe 3 O 4 .Up to now the surface electronic structure of magnetite w...

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Electronic structure of theFe3O4(111)surface

et al. 2004

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“…The experimental studies concerning the spin-resolved electronic structure of Fe 3 O 4 were performed mostly by means of photoelectron spectroscopy (PES) [23][24][25][26][27][28][29][30][31]. Due to a very low conduction of Fe 3 O 4 below T V = 120 K the spin-resolved electronic structure of Fe 3 O 4 cannot be studied by any superconductor spin-probing method, making spin-resolved PES [23][24][25][26][27][28][29][30][31] one of the most appropriate measurement techniques.…”

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confidence: 99%

“…Due to a very low conduction of Fe 3 O 4 below T V = 120 K the spin-resolved electronic structure of Fe 3 O 4 cannot be studied by any superconductor spin-probing method, making spin-resolved PES [23][24][25][26][27][28][29][30][31] one of the most appropriate measurement techniques.…”

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confidence: 99%

Magnetite: a search for the half-metallic state

Fonin¹,

Dedkov²,

Pentcheva³

et al. 2007

J. Phys.: Condens. Matter

103

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We present a detailed study of the spin-dependent electronic structure of thin epitaxial magnetite films of different crystallographic orientations. Using spin-and angle-resolved photoelectron spectroscopy at room temperature, we determine for epitaxial Fe 3 O 4 (111) films a maximum spin polarization value of −(80 ± 5)% near E F . The spin-resolved photoelectron spectra for binding energies between 1.5 eV and E F show good agreement with the spin-split band structure from density functional theory (DFT) calculations which predict an overall energy gap in the spin-up electron bands in high symmetry directions, thus providing evidence for the half-metallic ferromagnetic state of Fe 3 O 4 in the [111] direction. In the case of the Fe 3 O 4 (100) surface, both the spin-resolved photoelectron spectroscopy experiments and the DFT density of states give evidence for a half-metal to metal transition: the measured spin polarization of about −(55 ± 10)% at E F and the theoretical value of −40% are significantly lower than the −100% predicted by local spin density approximation (LSDA) calculations for the bulk magnetite crystal as well as the −(80 ± 5)% obtained for the Fe 3 O 4 (111) films. The experimental findings were corroborated by DFT calculations as due to a surface reconstruction leading to the electronic states in the majority-spin band gap and thus to the reduced spin polarization.

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“…The epitaxial growth of this system has already been studied in detail. [13][14][15][16][17][18] It turned out that the misfit of about 8.9% between the Fe and the Mo lattices leads to a lattice strain that is released by dislocations ordered in lines. 16 In situ grazing incidence x-ray scattering ͑GIXS͒ and calculations using elasticity theory predict a thickness-dependent uniaxial magnetic anisotropy with a ͓001͔ easy axis due to the relaxing strain.…”

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confidence: 99%

Structure-induced magnetic anisotropy in the Fe(110)∕Mo(110)∕Al2O3(112¯0) system

Fraune

Hauch

Güntherodt

et al. 2006

Journal of Applied Physics

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Fe͑110͒ films were epitaxially grown on sapphire substrates using a Mo͑110͒ buffer layer in an ultrahigh-vacuum molecular-beam epitaxy system. The magnetic properties were examined ex situ by Brillouin light scattering and superconducting quantum interference device magnetometry. To determine the magnetic anisotropy constants the frequency of the Damon-Eshbach ͓J. Phys. Chem. Solids 19, 308 ͑1961͔͒ surface spin-wave mode was measured as a function of the in-plane angle between the external magnetic field and the Fe͓001͔ crystal axis. The angle-dependent frequency was fitted by a spin-wave model. We found that the easy axis of the cubic magnetocrystalline anisotropy K 1 and an additional uniaxial in-plane anisotropy K ʈ ͑2͒ are aligned parallel to the in-planeFe͓001͔ axis for Fe-layer thicknesses from 0.8 to 37 nm, with K 1 increasing and K ʈ ͑2͒ decreasing with increasing Fe thickness. Possible origins of the observed uniaxial anisotropy are discussed.

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Preparation, structure, and electronic properties ofFe3O4films on the

Cited by 25 publications

References 38 publications

Electronic structure of theFe3O4(111)surface

Electronic structure of theFe3O4(111)surface

Magnetite: a search for the half-metallic state

Structure-induced magnetic anisotropy in the Fe(110)∕Mo(110)∕Al2O3(112¯0) system

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