Výsledky vyhledávání - "J. I. Mercer"

Dipolar ferromagnetism in three-dimensional superlattices of nanoparticles

Autor: J. P. Whitehead, J. van Lierop, B. W. Southern, J. I. Mercer, Bassel Alkadour

A series of atomistic finite temperature simulations on a model of an FCC lattice of maghemite nanoparticles using the stochastic Landau-Lifshitz-Gilbert (sLLG) equation are presented. The model exhibits a ferromagnetic transition that is in good agr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2379cc6d162296a2229645bc4d86cbc
http://arxiv.org/abs/1703.09290

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Kinetic Monte Carlo Simulations of the Effect of the Exchange Control Layer Thickness in CoPtCrB/CoPtCrSiO Granular Media

Autor: Ahmad M. Almudallal, J. P. Whitehead, J. I. Mercer, J. van Ek, Martin L. Plumer

A hybrid Landau Lifshitz Gilbert/kinetic Monte Carlo algorithm is used to simulate experimental magnetic hysteresis loops for dual layer exchange coupled composite media. The calculation of the rate coefficients and difficulties arising from low ener

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::206400be3d56da9594caa7449a705eae
http://arxiv.org/abs/1703.07018

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Kinetic Monte Carlo Simulations of $M\!\!-\!\!H$ Loops for HAMR Recording Media: Comparison With MOKE Data

Autor: J. P. Whitehead, Timothy J. Fal, Martin L. Plumer, Antony Ajan, J. I. Mercer, Jan van Ek

Publikováno v: IEEE Transactions on Magnetics. 50:22-26

Our previously developed kinetic Monte Carlo algorithm is used to simulate M-H loops of high anisotropy magnetic recording media at long time scales relevant to the experimental measurements using the magneto-optic Kerr effect. Micromagnetic paramete

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7be33dd150ee05eea4b9f3b8083a8a22
https://doi.org/10.1109/tmag.2013.2283659

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Surface vacancy mediated pinning of the magnetization inγ−Fe2O3nanoparticles: A micromagnetic simulation study

Autor: J. P. Whitehead, B. W. Southern, J. I. Mercer, J. van Lierop, Bassel Alkadour

Publikováno v: Physical Review B. 93

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::713b93f3ada7b73cbc7b8d3c989d74a4
https://doi.org/10.1103/physrevb.93.140411

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Long range dipolar field calculation using hybrid parallelism

Autor: J. I. Mercer

Publikováno v: Physics Procedia. 7:63-67

Calculating the dipolar fields in LLG simulations account for the majority of the runtime as these computations scale with system size faster than the other interactions. Efficient parallelization of the dipolar field is essential for a parallel LLG

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::85c0a3b7430dd92093cb865d13e239e1

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Thermally activated switching at long time scales in exchange-coupled magnetic grains

Autor: Martin L. Plumer, J. van Ek, T. J. Fal, Ahmad M. Almudallal, J. P. Whitehead, J. I. Mercer

Rate coefficients of the Arrhenius-Neel form are calculated for thermally activated magnetic moment reversal for dual layer exchange-coupled composite (ECC) media based on the Langer formalism and are applied to study the sweep rate dependence of MH

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ebe38f3cecd3d1bba7b0cf7bad2f16e4

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Kinetic Monte Carlo approach to modeling thermal decay in perpendicular recording media

Autor: Martin L. Plumer, J. van Ek, J. P. Whitehead, T. J. Fal, M. D. Leblanc, J. I. Mercer

Publikováno v: Physical Review B. 87

A procedure is developed to study the evolution of high anisotropy magnetic recording media due to thermally activated grain reversal. It is assumed that the system is composed of single domain grains that evolves by passing through a sequence of rel

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2d8dc517e4676c3cae4a3c6ee915e4de
https://doi.org/10.1103/physrevb.87.064405

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Corannulene and its penta-tert-butyl derivative co-crystallize 1:1 with pristine C60-fullerene

Autor: Paris E. Georghiou, Huu-Anh Tran, J. I. Mercer, Edward A. Jackson, Lawrence T. Scott, Tayel A. AlHujran, Louise N. Dawe

Publikováno v: Chemical communications (Cambridge, England). 48(45)

The first X-ray structural determinations of pristine fullerene C(60), cocrystallized 1:1 with corannulene and with its pentaalkyl-substituted derivative, 1,3,5,7,9-penta-tert-butyl-corannulene, have now been achieved.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dc94024575e93cf58de96449a6372eff
https://pubmed.ncbi.nlm.nih.gov/22466755

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Atomic level micromagnetic model of recording media switching at elevated temperatures

Autor: J. van Ek, J. P. Whitehead, J. I. Mercer, Martin L. Plumer

An atomic level micromagnetic model of granular recording media is developed and applied to examine external field-induced grain switching at elevated temperatures which captures non-uniform reversal modes. The results are compared with traditional m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::23dd0b9df9012769fdfc15f90c78dae3
http://arxiv.org/abs/1202.1131

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