Structure and magnetism of ultrathin Co film grown on Pt(100)

Pan, M. X.; He, Kunjin; Zhang, Lijuan; Jia, Jinfen; Xue, Qi‐Kun; Kim, Wondong; Qiu, Z. Q.

doi:10.1116/1.1885025

Cited by 4 publications

(3 citation statements)

References 36 publications

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“…Indeed, within the error bars, the observed maximum of µ L /µ S eff = 0.15 is found rising towards the expectations for both, ordered CoPt (µ L /µ S eff = 0.16) and CoPt 3 alloys (µ L /µ S eff = 0.19) in the easy axis of magnetization, corroborating the idea of alloy formation at these intermediate annealing temperatures. Such a finding is comparable to results from ultrathin Co films deposited on Pt(100) [ 35 ] and Pt(111) [ 36 ] single crystal surfaces, where alloying occurs between 300 °C to 400 °C. An alignment of the easy axis of magnetization should, however, be visible in the hysteresis loops discussed below.…”

Section: Resultssupporting

confidence: 83%

Nanoscaled alloy formation from self-assembled elemental Co nanoparticles on top of Pt films

Han¹,

Wiedwald²,

Biskupek³

et al. 2011

Beilstein J. Nanotechnol.

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SummaryThe thermally activated formation of nanoscale CoPt alloys was investigated, after deposition of self-assembled Co nanoparticles on textured Pt(111) and epitaxial Pt(100) films on MgO(100) and SrTiO3(100) substrates, respectively. For this purpose, metallic Co nanoparticles (diameter 7 nm) were prepared with a spacing of 100 nm by deposition of precursor-loaded reverse micelles, subsequent plasma etching and reduction on flat Pt surfaces. The samples were then annealed at successively higher temperatures under a H2 atmosphere, and the resulting variations of their structure, morphology and magnetic properties were characterized. We observed pronounced differences in the diffusion and alloying of Co nanoparticles on Pt films with different orientations and microstructures. On textured Pt(111) films exhibiting grain sizes (20–30 nm) smaller than the particle spacing (100 nm), the formation of local nanoalloys at the surface is strongly suppressed and Co incorporation into the film via grain boundaries is favoured. In contrast, due to the absence of grain boundaries on high quality epitaxial Pt(100) films with micron-sized grains, local alloying at the film surface was established. Signatures of alloy formation were evident from magnetic investigations. Upon annealing to temperatures up to 380 °C, we found an increase both of the coercive field and of the Co orbital magnetic moment, indicating the formation of a CoPt phase with strongly increased magnetic anisotropy compared to pure Co. At higher temperatures, however, the Co atoms diffuse into a nearby surface region where Pt-rich compounds are formed, as shown by element-specific microscopy.

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Section: Resultssupporting

confidence: 83%

Nanoscaled alloy formation from self-assembled elemental Co nanoparticles on top of Pt films

Han¹,

Wiedwald²,

Biskupek³

et al. 2011

Beilstein J. Nanotechnol.

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“…Since the Co atoms were deposited after the Fe ones, one can guess the system with a thin Co layer atop the FeSi alloy. In the study of Pan et al, [63] it was observed that H c = 150 Oe for 3.6 monolayers of thin Co film, which is close to the value for the obtained system. The formation of FeCo under graphene can also be suggested.…”

Section: Magnetic Propertiessupporting

confidence: 85%

Room Temperature Ferromagnetism in Graphene/SiC(0001) System Intercalated by Fe and Co

Filnov,

Estyunin,

Klimovskikh

et al. 2023

Physica Rapid Research Ltrs

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The utilization of graphene on silicon carbide (SiC) substrates holds substantial promise for advancements in spintronics and nanoelectronics. Furthermore, incorporating magnetic metals provides an optimal framework for probing fundamental physical phenomena. The approach to developing such systems is in situ intercalation of graphene with magnetic metals. Herein, the electronic structure is analyzed and the magnetic properties of the system are synthesized by the thermal decomposition of 6H‐SiC(0001) surface and subsequent intercalation of graphene with cobalt (Co) and iron (Fe) atoms. X‐ray photoemission spectroscopy and low‐energy electron diffraction are employed to control the synthesis and metal intercalation processes. The morphological characteristics of the synthesized system are studied by means of atomic force microscopy. The findings derived from magneto‐optic Kerr effect measurements reveal a homogeneous ferromagnetic ordering at room temperature. Angle‐resolved photoemission spectroscopy is used to ascertain the impact of intercalation on graphene's electronic structure. The results of this study are essential for the development of graphene‐based spintronics and nanoelectronic devices as well as for fundamental studies in magnetic graphene systems.

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“…Magnetisation-dependent spin-orbit gaps were also observed when the system symmetry was decreased compared to the bulk symmetry. Other factors influencing the interface or bulk terms include temperature conditions (annealing [317]), the presence of surfactants (capping layers [318,319]), and the stacking sequence [320], to name a few, and hence the spin reorientation in the metallic systems also depends on each of these parameters.…”

Section: Surface Modelmentioning

confidence: 99%

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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Structure and magnetism of ultrathin Co film grown on Pt(100)

Cited by 4 publications

References 36 publications

Nanoscaled alloy formation from self-assembled elemental Co nanoparticles on top of Pt films

Nanoscaled alloy formation from self-assembled elemental Co nanoparticles on top of Pt films

Room Temperature Ferromagnetism in Graphene/SiC(0001) System Intercalated by Fe and Co

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

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