Influence of thermomagnetic treatments on the magnetic properties of Co-Pt 50-50 alloy

Eurin, P.; Paulevé, J.

doi:10.1109/tmag.1969.1066471

Cited by 26 publications

(9 citation statements)

References 4 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: 54%

“…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: 54%

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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“…DFT calculations were shown to be capable of quantitatively describing the MAE and the orbital magnetisation in these alloys [409][410][411][412]. For example, in the case of the L1 0 CoPt crystal, DFT predicted an MAE of 4290 kJ/m 3 [227], very close to the experimental value of 4000 kJ/m 3 measured by Eurin [413] and much higher than that of the fcc or even hcp Co bulk (23.6 and 700-800 kJ/m 3 ).…”

Section: Alloyed Mnps: Effects Of Interfaces On Magnetic Propertiessupporting

confidence: 55%

A Perspective on Modelling Metallic Magnetic Nanoparticles in Biomedicine: From Monometals to Nanoalloys and Ligand-Protected Particles

Farkaš

Leeuw

2021

Materials

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The focus of this review is on the physical and magnetic properties that are related to the efficiency of monometallic magnetic nanoparticles used in biomedical applications, such as magnetic resonance imaging (MRI) or magnetic nanoparticle hyperthermia, and how to model these by theoretical methods, where the discussion is based on the example of cobalt nanoparticles. Different simulation systems (cluster, extended slab, and nanoparticle models) are critically appraised for their efficacy in the determination of reactivity, magnetic behaviour, and ligand-induced modifications of relevant properties. Simulations of the effects of nanoscale alloying with other metallic phases are also briefly reviewed.

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“…Using the saturated value of Marea for the Pt/Co bilayer sample, we determine the average saturation magnetization per unit volume (Ms) for the Co layer to be 1192 ± 10 emu/cm 3 (~1.43 μB/Co), lower than 1440 emu/cm 3 (~1.74 μB/Co) for bulk Co [24]. Compared to the Pt/Co bilayer sample, the saturated value of Marea for the Pt/Pt-Co/Co sample is enhanced by ~0.53×10 -4 emu/cm 2 , indicating an average Ms of 915 ± 29 emu/cm 3 (2.19±0.07 μB/Co) for the Pt-Co alloy spacer layer, which is suggestive of an enhanced magnetic proximity effect due to contact of Co with Pt [18] (e.g., ~2.13 μB/Co for L10-Pt50Co50 [25]). We also find that even the most dilute alloy (Pt3Co) is still magnetic at room temperature as indicated by the planar Hall signals in a 4 nm thick Pt3Co control sample ( Fig.…”

mentioning

confidence: 98%

Enhancement of spin transparency by interfacial alloying

2019

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We report that atomic-layer alloying (intermixing) at a Pt/Co interface can increase, by approximately 30%, rather than degrade the interfacial spin transparency, and thereby strengthen the efficiency of the dampinglike spin-orbit torque arising from the spin Hall effect in the Pt. At the same time, this interfacial alloying substantially reduces fieldlike spin-orbit torque. Insertion of an ultrathin magnetic alloy layer at heavy-metal/ferromagnet interfaces represents an effective approach for improving interfacial spin transparency that may enhance not only spin-orbit torques but also the spin detection efficiency in inverse spin Hall experiments.

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Influence of thermomagnetic treatments on the magnetic properties of Co-Pt 50-50 alloy

Cited by 26 publications

References 4 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

A Perspective on Modelling Metallic Magnetic Nanoparticles in Biomedicine: From Monometals to Nanoalloys and Ligand-Protected Particles

Enhancement of spin transparency by interfacial alloying

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