Experimental and theoretical x-ray magnetic-circular-dichroism study of the magnetic 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">Co</mml:mi></mml:mrow><mml:mrow><mml:mn>50</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pt</mml:mi></mml:mrow><mml:mrow><mml:mn>50</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>thin films

Grange, Wilfried; Galanakis, I.; Alouani, M.; Maret, M.; Kappler, J.P.; Рогалев, А.

doi:10.1103/physrevb.62.1157

Cited by 90 publications

(78 citation statements)

References 40 publications

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“…This anisotropy value for (Co/Pt) is also in excellent agreement with the value of 690 μeV/Co atom obtained by local spin density approximation calculations for a Co monolayer. 57 However, the experimental Magnetic Anisotropy energy (MAE) for CoPt in the L1 0 phase appears to be stronger, of the order of 1-2 meV/Co atom, 37,38 in agreement with calculations performed in the 1990s. 51,71,72 This larger MAE may be due to the higher number of Pt atoms neighboring each Co site.…”

Section: Magnetic Moments and Perpendicular Magnetic Anisotropy: supporting

confidence: 55%

“…Up to now, very few experiments have been performed on tailored ferromagnetic/semiconductor heterostructures in a remanent state characterized by a spontaneous out-of-plane magnetization. This property can be provided by 3d/4d or 3d/5d ordered alloys in the fcc L1 0 cubic phase presenting alternate planes of magnetic and nonmagnetic atoms, as in CoPt(001), 37,38 FePt(001), 39 and FePd(001) (Ref. 40) compounds, or in 3d/4d or 3d/5d superlattices as in the cases of Co/Pd (Refs.…”

Section: Introductionmentioning

confidence: 99%

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Spin injection at remanence into III-V spin light-emitting diodes using (Co/Pt) ferromagnetic injectors

et al. 2012

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We have studied the perpendicular magnetic anisotropy of Co/Pt multilayers and the electron spin injection efficiency by optical spectroscopy from a [Co(0.6 nm)/Pt(1 nm)] 4 /Fe(0.3 nm)/MgO perpendicular tunnel spin injector grown on AlGaAs/GaAs semiconductor light-emitting diodes. We observe a 2.5% circular polarization at low temperature close to the magnetic remanence when the 0.3 nm Fe film of the ferromagnetic injector is sufficiently thin to maintain the magnetization out of plane. The acquired squared magnetization cycle is explained by the remaining interlayer exchange coupling existing between Fe and the (Co/Pt) multilayer through Pt or possible perpendicular magnetic anisotropy at the MgO/Fe interface. The corresponding spin polarization of the current is then estimated as 7%, measured by photoluminescence techniques, after the necessary uprenormalization, taking into account the electron spin-flip rate in the quantum well. In contrast, no circular polarization is observed when the thin Fe layer is removed and despite the rather high magnetic polarizability of the 5d 9 electronic open shell of Pt at the interface with MgO. This emphasizes the reduced size of tunneling branching of wave functions at the interface, of the order of the atomic plane unit.

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Section: Magnetic Moments and Perpendicular Magnetic Anisotropy: supporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Spin injection at remanence into III-V spin light-emitting diodes using (Co/Pt) ferromagnetic injectors

et al. 2012

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“…Thus, the single Pt atom can increase the ratio, but only to a smaller amount as compared with the Pt (111) 26 and CoPt 3 (dotted line). 23 explained by the smaller number of Pt atoms taking part in the 3d-5d hybridization with the Co dimer. Please note that for the pure Co clusters there are differences in the size dependence on the different substrates.…”

Section: Resultsmentioning

confidence: 99%

Magnetic properties of small size-selected Co and CoPt clusters on Ni

et al. 2012

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Size and stoichiometry-dependent magnetic properties of deposited Co and CoPt alloy clusters on a Ni/Cu(100) substrate have been investigated by use of x-ray magnetic circular dichroism spectroscopy. Using sum rules, spin and orbital moments were extracted from the spectra. Spin and orbital moments show a strong size-dependent effect with a tendency for an increase with cluster size, which is in contrast to observations for Co clusters on a Pt(111) surface. Addition of a Pt atom to a Co dimer leads to a doubling of the orbital moment. CoPt clusters show a strong increase in chemical reactivity towards oxidation. The resulting Co n PtO x clusters show a ratio of orbital to spin moment comparable to the pure clusters, however, with a strong suppression of the absolute orbital and spin moments.

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“…Experimentally, sizeable spin and orbital magnetic moments in 5d transition metals due to the hybridization with a magnetic 3d element were found in e.g. FePd [13] and CoPt [14] alloys, Ni/Pt multilayers [15], and Ir impurities [16]. Also Fe mono-and bi-layers on W(110) received a considerable theoretical interest [17,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

Systematic theoretical study of the spin and orbital magnetic moments of4dand5dinterfaces with Fe films

et al. 2003

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Results of ab initio calculations using the relativistic Local Spin Density theory are presented for the magnetic moments of periodic 5d and 4d transition metal interfaces with bcc Fe(001). In this systematic study we calculated the layer-resolved spin and orbital magnetic moments over the entire series. For the Fe/W(001) system, the Fe spin moment is reduced whilst its orbital moment is strongly enhanced. In the W layers a spin moment is induced, which is antiparallel to that of Fe in the first and fourth W layers but parallel to Fe in the second and third W layers. The W orbital moment does not follow the spin moment. It is aligned antiparallel to Fe in the first two W layers and changes sign in the third and fourth W layers. Therefore, Hund's third rule is violated in the first and third W layers, but not in the second and fourth W layers. The trend in the spin and orbital moments over the 4d and 5d series for multilayers is quite similar to previous impurity calculations. These observations strongly suggest that these effects can be seen as a consequence of the hybridization between 5d (4d) and Fe which is mostly due to band filling, and to a lesser extent geometrical effects of either single impurity or interface.

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Experimental and theoretical x-ray magnetic-circular-dichroism study of the magnetic properties ofCo50Pt50thin films

Cited by 90 publications

References 40 publications

Spin injection at remanence into III-V spin light-emitting diodes using (Co/Pt) ferromagnetic injectors

Spin injection at remanence into III-V spin light-emitting diodes using (Co/Pt) ferromagnetic injectors

Magnetic properties of small size-selected Co and CoPt clusters on Ni

Systematic theoretical study of the spin and orbital magnetic moments of4dand5dinterfaces with Fe films

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