Perpendicular magnetic anisotropy and complex magnetotransport behavior of cobalt nanoparticles in silver matrix

Kumar, Dinesh; Chaudhary, Sujeet; Pandya, Dinesh K.

doi:10.1063/1.4918769

Cited by 7 publications

(2 citation statements)

References 20 publications

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“…In the last few decades, cobalt nanoparticles have been investigated and used mainly in catalysis [1,2] and magnetic data storage fields [3][4][5]. However, a long list of shortcomings of materials that have so far been implemented in magnetic hyperthermia treatments (e.g.…”

Section: Introductionmentioning

confidence: 99%

Towards a morphology of cobalt nanoparticles: size and strain effects

Farkaš

Leeuw

2020

Nanotechnology

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Cobalt nanoparticles with diameters of 8 nm have recently shown promising performance for biomedical applications. However, it is still unclear how the shape of cobalt clusters changes with size when reaching the nanoparticle range. In the present work, density functional theory calculations have been employed to compare the stabilities of two non-crystalline (icosahedron and decahedron) shapes, and three crystalline motifs (hcp, fcc, and bcc) for magic numbered cobalt clusters with up to 1500 atoms, based on the changes in the cohesive energies, coordination numbers, and nearest-neighbour distances arising from varying geometries. Obtained trends were extrapolated to a 104 size range, and an icosahedral shape was predicted for clusters up to 5500 atoms. Larger sized clusters adopt hcp stacking, in correspondence with the bulk phase. To explain the crystalline/non-crystalline crossovers, the contributions of the elastic strain density and twin boundary from the specimen surfaces to the cohesive energy of different motifs were evaluated. These results are expected to aid the design and synthesis of cobalt nanoparticles for applications ranging from catalysis to biomedical treatments.

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Section: Introductionmentioning

confidence: 99%

Towards a morphology of cobalt nanoparticles: size and strain effects

Farkaš

Leeuw

2020

Nanotechnology

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“…These excellent properties have brought interesting potential applications for magnetic read heads and sensors. Generally, Co-Cu granular films could be obtained by the application of various techniques, such as magnetron sputtering, molecular beam epitaxy, ion-beam sputtering and electrodeposition [7][8][9][10][11][12][13][14][15][16]. Among them, electrodeposition has been regarded as a successful one to produce films with practical technological applications due to its advantages of cost effectiveness, ease of processability, large area deposition and relatively low temperature [17].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical preparation and magnetic properties of Co–Cu nanometric granular alloy films

et al. 2019

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A detailed electrodeposition of Co-Cu nanometric granular alloy films in citrate solution has been performed based on a galvanostatic technique. Electrochemical behaviour of the bath solution containing both Co 2+ and Cu 2+ was investigated by linear sweep voltammetry. Cathodic polarization curves indicated that high quality Co-Cu nanometric granular alloy films can be obtained at room temperature with a pH of 6 and current density equal to or more negative than − 1.0 mA cm −2. Magnetic properties of the films were measured at room temperature by the physical property measurement system. Magnetization curves of the as-prepared Co-Cu nanometric granular alloy films displayed superparamagnetism (SPM). However, after annealing at 450 • C for 1 h, magnetic property of the films changed from SPM to ferromagnetism. Meanwhile, the annealed Co-Cu nanometric granular alloy films showed an increase in saturation magnetization with the increase of the current density.

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sp‐Carbon‐Conjugated Organic Polymer as Multifunctional Interfacial Layers for Ultra‐Long Dendrite‐Free Lithium Metal Batteries

Lu,

Cao,

Sun

et al. 2024

Angewandte Chemie

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Fatal issues in lithium metal anodes (LMA), such as detrimental lithium dendrites growth and fragile solid‐electrolyte interphase (SEI) during the Li plating/stripping process, often hinder the practical application of Li metal batteries (LMBs). Herein, cobalt‐coordinated sp‐carbon‐conjugated organic polymer (Co‐spc‐COP) is constructed as the protective layer for regulating the interface stability of LMA. The unique synergistic beneficial effect of organic functional groups (C≡C linkage, C=N units, aromatic rings) and Co sites not only regulate the Li+ coordination environment and rearrange Li+ concentration to facilitate its transport by optimizing the electronic density, enhancing the compatibility with electrolyte interface and supplying “external magnetic driving strategy”, but also strengthens the interfacial stiffness with high Young’s modulus to better withstand the mechanical stress. These beneficial effects and relative underlying working mode and mechanism of the uniform Li plating and rapid Li+ migration on the Co‐spc‐COP are also revealed by various in‐situ/ex‐situ experimental technologies and theory calculation. The Co‐spc‐COP‐based cell delivers an extraordinary lifespan of 6600 h and ultrahigh capacity retention of 78.3% (111.9 mAh g‐1) after 1000 cycles at 1 C. This demonstrated synergistic strategy in Co‐coordinated organic polymer may gain new insights to regulate the uniform and non‐dendritic deposition/dissolution behaviors for highly stable LMBs.

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Perpendicular magnetic anisotropy and complex magnetotransport behavior of cobalt nanoparticles in silver matrix

Abstract: Correlation between perpendicular exchange bias and magnetic anisotropy inIrMn ∕ [ Co ∕ Pt ] n and [ Pt ∕ Co ] n ∕ IrMn multilayers J. Appl. Phys. 97, 063907 (2005); 10.1063/1.1861964 Magnetic cluster size and activation volume in perpendicular recording media

Cited by 7 publications

References 20 publications

Towards a morphology of cobalt nanoparticles: size and strain effects

Towards a morphology of cobalt nanoparticles: size and strain effects

Electrochemical preparation and magnetic properties of Co–Cu nanometric granular alloy films

sp‐Carbon‐Conjugated Organic Polymer as Multifunctional Interfacial Layers for Ultra‐Long Dendrite‐Free Lithium Metal Batteries

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