Structural and magnetic properties of Cu/Co and Au/Co multilayers

Pizzini, S.; Baudelet, F.; Dartyge, E.; Fontaine, A.; Giorgetti, C.; Bobo, J.F.; Piécuch, M.; Marlière, C.

doi:10.1016/0304-8853(93)91187-c

Cited by 26 publications

(9 citation statements)

References 9 publications

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“…The FT of the standard Co foil shown in Fig. 4͑b͒ ͑thin line͒ reproduces well the results from the literature 33,34 for Co with hcp stacking for both the distance and amplitude of the two first neighbor shells contributing to the main peak. In contrast, the atomic distances for the Co foil were calculated in a range of R: 1.24 Å Ͻ R Ͻ 5.60 Å also accounting for the contribution of more distant neighbor shells and the multiple-scattering contributions within this distance range.…”

Section: B Co K-edge Exafssupporting

confidence: 83%

“…All attempts to include Au neighbors considerably deteriorated the quality of the fit in agreement with the results for Au/ Co/ Au multilayers 34 and Co on Au͑111͒. 33 These studies already indicate that in the EXAFS signal the Au atoms are not making a contribution due to the increased disorder of the Co-Au bonds.…”

Section: B Co K-edge Exafssupporting

confidence: 72%

“…These values are both smaller than 2.88 Å, indicating a nonpseudomorphic growth of Co on the Au underlayer in contrast to what has been found by EXAFS for ͑Co/ Au͒ multilayers. 34 It must be kept in mind that the Au underlayer is deposited directly onto amorphous native oxide existing on the semiconductor substrate surface. 9 We thus expect that this Au underlayer will be polycrystalline with ͑111͒ texture, since this is the face with the lowest energy, and our results can be compared with previous work on layered systems.…”

Section: B Co K-edge Exafsmentioning

confidence: 99%

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Experimental investigation of the spin reorientation ofCo∕Aubased magnetic nanodot arrays

et al. 2008

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͑Co/ Au͒ and ͑Au/ Co/ Au͒ nanomagnet arrays grown on nanostructured self-organized SiGe templates have been characterized by means of x-ray photoemission electron microscopy, x-ray magnetic circular dichroism, and by extended x-ray absorption spectroscopy using synchrotron radiation. In-plane magnetization is observed at room temperature for practically all Co thicknesses, a stable macroscopic perpendicular magnetic order only at low temperature. The spin reorientation transition in these dot arrays takes place for smaller Co thicknesses over a broader thickness range than in two-dimensional systems. This finding appears to be related with structural relaxation modifications, occurring within the local Co atom environment, which are not necessarily connected with the orbital moment variations. These variations appear in the form of a systematic increase, correlated with the existence of out-of-plane magnetization.

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Section: B Co K-edge Exafssupporting

confidence: 83%

Section: B Co K-edge Exafssupporting

confidence: 72%

Section: B Co K-edge Exafsmentioning

confidence: 99%

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Experimental investigation of the spin reorientation ofCo∕Aubased magnetic nanodot arrays

et al. 2008

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“…20 Apart from the studies of XMCD spectra at the K edge on the pure elements Fe, 15,[80][81][82][83][84][85] Co, 80,85 and Ni, 83,85 many different systems have been investigated so far. K edge studies supply valuable additional information, for example, on the exchange coupling in compounds ͓Mn in PtMnSb, 80 80,92 and multilayer systems ͑Fe in Fe/ Co, 90 Fe/ Cu, 93,94 Fe/ La, 81 Fe/ Ce, 81 Fe/ Nd, 95,96 Fe/ Gd, 97 Co in Co/ Cu, 93,94,98 Cu in Co/ Cu, 93,94,98 and Fe/ Cu 93,94 ͔.…”

Section: D Metals and Compoundsmentioning

confidence: 99%

X-ray magnetic circular dichroism in d and f ferromagnetic materials: recent theoretical progress. Part I (Review Article)

Antonov

Shpak

Yaresko

2008

Low Temperature Physics

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Articles you may be interested inRational design of Nb-based alloys for hydrogen separation: A first principles study AIP Advances 3, 022102 (2013); 10.1063/1.4790627 Effects of alloying elements and temperature on the elastic properties of dilute Ni-base superalloys from firstprinciples calculations J. Appl. Phys. 112, 053515 (2012); 10.1063/1.4749406 Thin film reaction of transition metals with germanium J. Vac. Sci. Technol. A 24, 474 (2006); 10.1116/1.2191861 Ab initio study on stability of half-metallic Co-based full-Heusler alloys J. Appl. Phys. 99, 08J112 (2006); 10.1063/1.2176907 X-ray absorption and magnetic circular dichroism studies of annealed magnetic tunnel junctionsThe present state of theoretical understanding of the x-ray magnetic circular dichroism ͑XMCD͒ of 3d compounds is reviewed. Energy band theory based upon the local spin-density approximation ͑LSDA͒ describes the XMCD spectra of transition metal compounds reasonably well. Examples which we examine in detail are XPt 3 compounds ͑with X = V, Cr, Mn, Fe, Co, and Ni͒ in the AuCu 3 structure, the Heusler compounds Co 2 MnGe and Co 2 NbSn, and the compounds with noncollinear magnetic structure IrMnAl and Mn 3 ZnC. Recently achieved improvements for describing the electronic and magnetic structures of 3d compounds are discussed.

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“…For example, the combination of Co and Au in the form of bilayers, multilayers, core‐shell nanoparticles, or bimetallic magnetic nanoparticles has also been utilized in preparing nanoparticles for medical applications on the basis of their magneto‐plasmonic properties, which are useful in preparing sensors 8–12 . Properties of such transition metal/nonmagnetic nanomaterials are the subject of extensive research because of the wide field of application in magnetic recording and storage media 13,14 and also for basic understanding of their novel physical properties such as giant magnetoresistance, perpendicular magnetic anisotropy, 15–17 spin torque transfer effect, 18 light‐guiding capabilities, 19 and bonding among atoms 20 . Particularly, Co and Au combined system was investigated by various researchers in past due to several novel properties exhibited by this system including perpendicular magnetic anisotropy (PMA), 15,17 magneto‐optical, and magneto resistance properties 19,21,22 .…”

Section: Introductionmentioning

confidence: 99%

Magnetic transition in ultrathin Co sandwiched between Au layers in [Au (3.16 nm)/Co (1.5 nm)]_x35/Si(100) multilayers

Tripathi

Sharma

Kumar

et al. 2020

Surface & Interface Analysis

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The superparamagnetic to ferromagnetic transition in ultrathin Co layers has been investigated by systematic annealing of Co ultrathin layer sandwiched between a pair of Au layer in the [Au (3.16 nm)/Co (1.5 nm)]x35/Si(100) multilayers. Apart from this magnetic transition, annealing‐induced modifications in morphological and structural properties of this discontinuous island like Co ultrathin layer have also been investigated. The thickness and number of Co and Au layers were so chosen as to make a composition of 20 weight percent (wt%) Co in Au matrix. X‐ray diffraction and reflectivity measurements reveal the formation of a bilayer stack showing Bragg's peaks, which disappear upon annealing beyond 200°C due to mixing of layers. Corresponding SQUID results show a transition from superparamagnetic to ferromagnetic phase beyond 200°C, indicating the clusterization of Co, which is enabled by nonmiscible nature of Co and Au. The results are interpreted in terms of annealing‐dependent mobility of Co and Au atoms resulting in superparamagnetic to ferromagnetic and finally to a non‐magnetic phase.

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Structural and magnetic properties of Cu/Co and Au/Co multilayers

Cited by 26 publications

References 9 publications

Experimental investigation of the spin reorientation ofCo∕Aubased magnetic nanodot arrays

Experimental investigation of the spin reorientation ofCo∕Aubased magnetic nanodot arrays

X-ray magnetic circular dichroism in d and f ferromagnetic materials: recent theoretical progress. Part I (Review Article)

Magnetic transition in ultrathin Co sandwiched between Au layers in [Au (3.16 nm)/Co (1.5 nm)]_x35/Si(100) multilayers

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Structural and magnetic properties of Cu/Co and Au/Co multilayers

Cited by 26 publications

References 9 publications

Experimental investigation of the spin reorientation ofCo∕Aubased magnetic nanodot arrays

Experimental investigation of the spin reorientation ofCo∕Aubased magnetic nanodot arrays

X-ray magnetic circular dichroism in d and f ferromagnetic materials: recent theoretical progress. Part I (Review Article)

Magnetic transition in ultrathin Co sandwiched between Au layers in [Au (3.16 nm)/Co (1.5 nm)]x35/Si(100) multilayers

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Magnetic transition in ultrathin Co sandwiched between Au layers in [Au (3.16 nm)/Co (1.5 nm)]_x35/Si(100) multilayers