Magnetic structure of Fe-doped CoFe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>probed by x-ray magnetic spectroscopies

Moyer, Jarrett A.; Vaz, C. A. F.; Arena, D. A.; Kumah, Divine P.; Negusse, Ezana; Henrich, Victor E.

doi:10.1103/physrevb.84.054447

Cited by 81 publications

(74 citation statements)

References 63 publications

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“…Fe absorption spectra of the CFO and NFO samples have similar line shapes to spectra of Fe-containing spinels found in the literature. 24,26 Areas in which the XMCD contrast shows stripe modulation as in Fig. 1 also show a modulation of Fe L 2 XLD with the same periodicity as the XMCD modulation.…”

Section: A Substrate-induced Modification Of the Magnetic Domain Strmentioning

confidence: 76%

Spatially resolved strain-imprinted magnetic states in an artificial multiferroic

et al. 2012

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Artificial multiferroic systems, in which novel properties can emerge from elastic coupling between piezoelectric and magnetostrictive phases, are a promising route to obtain significant room-temperature magnetoelectric coupling at the nanoscale. In this work, we have used element-specific soft x-ray photoemission electron microscopy to spatially resolve the effects of ferroelectric BaTiO 3 on the magnetic properties of ferromagnetic layers of CoFe 2 O 4 and NiFe 2 O 4 . Resulting from the large magnetoelastic anisotropy present in these artificial multiferroic systems, a modification of the orientation and symmetry of the magnetic easy axes of the ferromagnetic film upon changing the underlying domain structure of the ferroelectric has been observed. This opens the possibility to strain-imprint magnetic states in these systems.

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Section: A Substrate-induced Modification Of the Magnetic Domain Strmentioning

confidence: 76%

Spatially resolved strain-imprinted magnetic states in an artificial multiferroic

et al. 2012

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“…Such a reduced value is however in good agreement with those measured in CoFe 2 O 4 thin films. 38 In such case, the difference to the single atom value was attributed to a significant Co population in tetrahedral positions. We lack a direct estimate of the inversion level, but it might be the origin of our reduced moment as well.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, the Co XMCD spectrum has the shape characteristic of Co 2+ cations. 38 Thus, upon depositing 6 Co at/u.c. at room temperature on magnetite (001), Co atoms preferentially become Co 2+ and are antiferromagnetically coupled to Fe oct .…”

Section: A Experimental Observationsmentioning

confidence: 99%

Co on Fe3O4(001): Towards precise control of surface properties

Gargallo-Caballero

Martín-García

Quesada

et al. 2016

The Journal of Chemical Physics

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A novel approach to incorporate cobalt atoms into a magnetite single crystal is demonstrated by a combination of x-ray spectro-microscopy, low-energy electron diffraction, and density-functional theory calculations. Co is deposited at room temperature on the reconstructed magnetite (001) surface filling first the subsurface octahedral vacancies and then occupying adatom sites on the surface. Progressive annealing treatments at temperatures up to 733 K diffuse the Co atoms into deeper crystal positions, mainly into octahedral ones with a marked inversion level. The oxidation state, coordination, and magnetic moments of the cobalt atoms are followed from their adsorption to their final incorporation into the bulk, mostly as octahedral Co2+. This precise control of the near-surface Co atoms location opens up the way to accurately tune the surface physical and magnetic properties of mixed spinel oxides.

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“…In consequence the spectrum has been fitted to two sextet contributions, whose parameters are shown in Table 1. In the RT spectrum, the isomer shift (δ), quadrupole shift (2ε) and hyperfine fields correspond clearly to 3 Such large difference between each component area is striking. There are two possibilities to explain it: either (i) the recoil free fraction of iron cations in the two sites is very different at room temperature, or (ii) the recoil free fraction is similar but the relative population of octahedral and tetrahedral iron cations is very different from the expected 1 : 1 one.…”

Section: Target Characterizationmentioning

confidence: 99%

“…Adjusting the ratio of Co and Fe has been achieved in molecular beam epitaxy growth by changing the Fe : Co ratio, [2,3] with the films being presumably homogeneous. We note that it is complicated to detect a segregated M Fe-Co oxide with averaging techniques, or even resolved ones, if both phases are coherent.…”

Section: Introductionmentioning

confidence: 99%

Mössbauer and Magnetic Properties of Coherently Mixed Magnetite-Cobalt Ferrite Grown by Infrared Pulsed-Laser Deposition

Figuera¹,

Quesada²,

Martín-García³

et al. 2015

Croat. Chem. Acta

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Abstract:We have studied the magnetic properties and the composition of cobalt ferrite single crystal films on SrTiO3 : Nb grown by infrared pulsed-laser deposition. Mössbauer spectra have been recorded from both the target used to grow the films and the films themselves. The Mössbauer spectra of the target taken at low temperatures show a strong dependence of the recoil free fraction of the octahedral sites with temperature. The films composition, with a coexistence of Co-enriched cobalt ferrite and magnetite, has been estimated assuming a similar ratio of the recoil free fractions of the films. X-ray absorption and x-ray magnetic circular dichroism measurements confirm the valence composition of the film and show ferromagnetic Fe-Co coupling in the films with a coercive field around 0.5 T at room temperature. The combination of these characterization techniques allows establishing the coherent structural and magnetic properties of this biphase system.

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Magnetic structure of Fe-doped CoFe2O4probed by x-ray magnetic spectroscopies

Cited by 81 publications

References 63 publications

Spatially resolved strain-imprinted magnetic states in an artificial multiferroic

Spatially resolved strain-imprinted magnetic states in an artificial multiferroic

Co on Fe3O4(001): Towards precise control of surface properties

Mössbauer and Magnetic Properties of Coherently Mixed Magnetite-Cobalt Ferrite Grown by Infrared Pulsed-Laser Deposition

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