Observation of x-ray magnetic circular dichroism at the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Ru</mml:mi><mml:mspace width="0.3em" /><mml:mi>K</mml:mi></mml:mrow></mml:math>edge in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Co</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Ru</mml:mi></mml:mrow></mml:math>alloys

Hashizume, H.; Ishiji, Kotaro; Lang, J. C.; Haskel, D.; Srajer, G.; Minář, J.; Ebert, H.

doi:10.1103/physrevb.73.224416

Cited by 13 publications

(10 citation statements)

References 28 publications

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“…By contrast, the magnetic polarization of 4d electrons by Fe atoms has been widely reported in the case of Pd/Fe multilayers [53] and Fe 1−x Rh x alloys [54]. Similar results extend to the polarization of nominally non-magnetic atoms such as Ru, Ag, Cu and Au by Co in granular alloys and multilayers [10,55,56].…”

Section: Magnetization Resultssupporting

confidence: 63%

Interfacial magnetic coupling between Fe nanoparticles in Fe–Ag granular alloys

Alonso¹,

Fdez-Gubieda²,

Sarmiento³

et al. 2011

Nanotechnology

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The role of the interface in mediating interparticle magnetic interactions has been analysed in Fe50Ag50 and Fe55Ag45 granular thin films deposited by the pulsed laser deposition technique (PLD). These samples are composed of crystalline bcc Fe (2–4 nm) nanoparticles and fcc Ag (10–12 nm) nanoparticles, separated by an amorphous Fe50Ag50 interface, occupying around 20% of the sample volume, as determined by x-ray diffraction (XRD), x-ray absorption spectroscopy (XAS), and high resolution transmission electron microscopy (HRTEM). Interfacial magnetic coupling between Fe nanoparticles is studied by dc magnetization and x-ray magnetic circular dichroism (XMCD) measurements at the Fe K and Ag L2,3 edges. This paper reveals that these thin films present two magnetic transitions, at low and high temperatures, which are strongly related to the magnetic state of the amorphous interface, which acts as a barrier for interparticle magnetic coupling.

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Section: Magnetization Resultssupporting

confidence: 63%

Interfacial magnetic coupling between Fe nanoparticles in Fe–Ag granular alloys

Alonso¹,

Fdez-Gubieda²,

Sarmiento³

et al. 2011

Nanotechnology

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“…Moreover, we provide a detailed investigation of the lower limit of magnetic properties localization in such a composition graded ferromagnet. CoRu alloy is ideal for this study, as it is a very simple ferromagnet with easily tunable magnetic properties [10][11][12][13][14] . Over a wide range of x, Co 1−x Ru x forms a stable solid solution with the hcp crystal structure characteristic of pure Co, with both T C and saturation magnetization M S that decrease almost linearly with x.…”

Section: Sample Preparationmentioning

confidence: 99%

Nanoscale magnetic localization in exchange strength modulated ferromagnets

et al. 2018

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Although ferromagnetism is in general a long-range collective phenomenon, it is possible to induce local spatial variations of magnetic properties in ferromagnetic materials. For example, systematic variation of the exchange coupling strength can be used to create systems that behave as if they are comprised of virtually independent segments that exhibit "local" Curie temperatures. Such localization of thermodynamic behavior leads to boundaries between strongly and weakly magnetized regions that can be controllably moved within the material with temperature. The utility of this interesting functionality is largely dependent on the inherent spatial resolution of magnetic properties -specifically the distance over which the exchange strength and corresponding properties behave locally. To test the degree to which this type of localization can be realized in materials, we have fabricated epitaxial films of Co1−xRux alloy featuring a nanometer scale triangular wavelike concentration depth profile. Continuous nanoscale modulation of the local Curie temperature was observed using polarized neutron reflectometry. These results are consistent with mean-field simulations of spin systems that encompass the possibility of delocalized exchange coupling, and show that composition grading can be used to localize magnetic properties in films down to the nanometer level. Since this is demonstrated here for an itinerant metal, we assert that for virtually any modulated magnetic material system, collective effects can be suppressed to length scales smaller than about 3 nm, so that magnetic behavior overall can be well described in terms of local material properties.

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“…In addition, hybridization at the interface alters the distribution of electronic levels and subsequently the magnetic properties of both the magnetic film and the polarized cap material, with a direct impact on the MAE. Some Co-based thin film systems, such as those including Cu, Au and Pt [22,23,24,20,25], have received more attention in the literature than Co/Ru [26,27,28,29,26,30]. Nonetheless, Co/Ru is a particularly interesting prototypical system.…”

Section: Introductionmentioning

confidence: 99%

Noble metal capping effects on the spin-reorientation transitions of Co/Ru(0001)

et al. 2008

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Thin films of Co/Ru(0001) are known to exhibit an unusual spin reorientation transition (SRT) coupled to the completion of Co atomic layers for Co thicknesses under 4 layers. By means of spin-polarized low-energy electron microscopy, we follow in real space the magnetization orientation during the growth of atomically thick capping layers on Co/Ru(0001). Capping with coinage-metal (Cu, Ag, Au) elements modifies the SRT depending on the Co and overlayer thickness and on the overlayer material, resulting in an expanded range of structures with high perpendicular magnetic anisotropy. The origin of the SRT can be explained in terms of ab-initio calculations of the layer-resolved contributions to the magnetic anisotropy energy. Besides the changes in the SRT introduced by the capping, a quantitative enhancement of the magnetic anisotropy is identified. A detailed analysis of the interplay between strain and purely electronic effects allows us to identify the conditions that lead to a high perpendicular magnetic anisotropy in thin hcp Co films.

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Observation of x-ray magnetic circular dichroism at theRuKedge inCo−Rualloys

Cited by 13 publications

References 28 publications

Interfacial magnetic coupling between Fe nanoparticles in Fe–Ag granular alloys

Interfacial magnetic coupling between Fe nanoparticles in Fe–Ag granular alloys

Nanoscale magnetic localization in exchange strength modulated ferromagnets

Noble metal capping effects on the spin-reorientation transitions of Co/Ru(0001)

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