Role of magnetic concentration in modulating the magnetic properties of ultra-small FePt nanoparticles

Adelani, Pius O.; Duke, Aaron N.; Zhou, Benjamin H.; Rinehart, Jeffrey D.

doi:10.1016/j.ica.2016.09.020

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…An additional evidence of the former assumption is the virtually constant T B for the samples with different thickness of the magnetic shield because of Ni oxidation in Ni core Au shell −2 despite the fact that a change in the magnetic isolation degree influences on T B . 31 Taking into account these results and especially the symmetry of the magnetization curves at under T B (Figure 5), we can conclude that the magnetic exchange anisotropy does not have any influence on the object investigated. Otherwise, this effect could take place if there were the interface of Ni−NiO antiferromagnetic .…”

Section: Resultsmentioning

confidence: 64%

“…The combination of these features makes the diamagnetic shell solid and thicker to increase the magnetic isolation of Ni cores. An additional evidence of the former assumption is the virtually constant T B for the samples with different thickness of the magnetic shield because of Ni oxidation in Ni core Au shell –2 despite the fact that a change in the magnetic isolation degree influences on T B …”

Section: Resultsmentioning

confidence: 99%

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Influence of Ni_coreAu_shell Nanoparticles’ Morphology on Their Magnetic Properties

et al. 2019

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This paper reveals and describes the features of Ni core Au shell nanoparticles' magnetic properties. Their activation energy of monodomain thermal relaxation (5.1 × 10 −20 J) and constant of magnetic crystalline anisotropy ((2.0−2.1) × 10 4 J/m 3 ) are higher than bulk nickel has. Compared with nanostructured fcc-Ni powders, there is a decrease in the coercive force, the presence of "hard" magnetization, rising magnetization along with increasing degree of the nanoparticles' oxidation, and a decrease in magnetic characteristics to very low values at 300 K. These features are related to the structure of Ni cores (size and ico-structure of their units), shielding by Au shells, Au−Ni solid solution, and Ni(OH) 2 , and their nearsurface "frozen" spin subsystem. The latter depends on the sizes of nanocores and the Au−Ni interface. All of these features were discussed on the basis of material science research the authors provided for the Ni core Au shell nanoparticles. This long-term study was completed by the present investigation as the most detailed for magneticdiamagnetic core−shell systems nanosized nowadays.

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Section: Resultsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Influence of Ni_coreAu_shell Nanoparticles’ Morphology on Their Magnetic Properties

et al. 2019

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“…Their magnetic properties essentially depend on the NP size because the thermal energy kT becomes comparable to the KV product term, where k T , K and V are the Boltzmann constant, the temperature, the constant of the so-called magnetic anisotropy of the nanoparticle (NP) and its volume, respectively 1 . As a result, the magnetization of the nanocluster can randomly flip direction depending on the temperature, and thus NP can be fixed in the so-called superparamagnetic state 1 – 3 .…”

Section: Introductionmentioning

confidence: 99%

First-principles calculations on Fe-Pt nanoclusters of various morphologies

Platonenko

Piskunov

Bocharov

et al. 2017

Sci Rep

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Bimetallic FePt nanoparticles with L1 0 structure are attracting a lot of attention due to their high magnetocrystalline anisotropy and high coercivity what makes them potential material for storage of ultra-high density magnetic data. FePt nanoclusters are considered also as nanocatalysts for growth of carbon nanotubes of different chiralities. Using the DFT-LCAO CRYSTAL14 code, we have performed large-scale spin-polarized calculations on 19 different polyhedral structures of FePt nanoparticles in order to estimate which icosahedral or hcp-structured morphology is the energetically more preferable. Surface energy calculations of all aforementioned nanoparticles indicate that the global minimum corresponds to the nanocluster possessing the icosahedron “onion-like” structure and Fe43Pt104 morphology where the outer layer consists of Pt atoms. The presence of the Pt-enriched layer around FePt core explains high oxidation resistance and environmental stability, both observed experimentally.

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Diffusion of Au and its influence on the coercivity of [FePt/Au/FePt]2x thin films during annealing in different atmospheres

et al. 2018

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Role of magnetic concentration in modulating the magnetic properties of ultra-small FePt nanoparticles

Cited by 5 publications

References 24 publications

Influence of Ni_coreAu_shell Nanoparticles’ Morphology on Their Magnetic Properties

Influence of Ni_coreAu_shell Nanoparticles’ Morphology on Their Magnetic Properties

First-principles calculations on Fe-Pt nanoclusters of various morphologies

Diffusion of Au and its influence on the coercivity of [FePt/Au/FePt]2x thin films during annealing in different atmospheres

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Role of magnetic concentration in modulating the magnetic properties of ultra-small FePt nanoparticles

Cited by 5 publications

References 24 publications

Influence of NicoreAushell Nanoparticles’ Morphology on Their Magnetic Properties

Influence of NicoreAushell Nanoparticles’ Morphology on Their Magnetic Properties

First-principles calculations on Fe-Pt nanoclusters of various morphologies

Diffusion of Au and its influence on the coercivity of [FePt/Au/FePt]2x thin films during annealing in different atmospheres

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Product

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Influence of Ni_coreAu_shell Nanoparticles’ Morphology on Their Magnetic Properties

Influence of Ni_coreAu_shell Nanoparticles’ Morphology on Their Magnetic Properties