Mesoscale Quantum Dissipation with Applications to Nanotechnolgy

Project Information

NANOMAGNETS

Grant agreement ID: 230785

Project closed

Start date 1 February 2009

End date 31 January 2012

Funded under

• Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)

Total cost No data

EU contribution € 50 400,00

Coordinated by

UNIVERSITE DE PERPIGNAN
France

Objective

Quantum dissipation arising from quantum fluctuations and the quantum mechanics of macroscopic variables is important because of the ever decreasing size (mesoscale) of the nanoparticles used in technology. The most striking example occurs in information storage by magnetic nanoparticles, where the governing factor for magnetisation reversal by macroscopic quantum tunnelling is spin size S. The S dependence, with associated large quantum effects, becomes evermore marked as one proceeds from single domain particles to molecular clusters to single molecule magnets to individual spins. Here in the context of a general investigation of mesoscale quantum mechanics of particles (separable and additive Hamiltonians) and spins it is proposed to generalise Wigner’s quasi phase space formulation of quantum mechanics without dissipation (originally used to calculate quantum corrections to classical statistical mechanics i.e. the quantum/classical borderline characteristic of the mesoscale), to systems with non-separable Hamiltonians (spins) including the effects of dissipation to the surrounding heat bath. The results, obtained by (a) matrix continued fraction methods of solution of the appropriate master equations (b) computer simulation and (c) quantum Kramers escape rate theory will be compared with suitable experimental observations of the escape rate and the associated susceptibilities of nanoparticles.

Fields of science (EuroSciVoc)

CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques.

• natural sciences › physical sciences › quantum physics
• natural sciences › physical sciences › classical mechanics › statistical mechanics
• engineering and technology › nanotechnology › nano-materials
• natural sciences › mathematics › applied mathematics › mathematical model

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Keywords

• Information storage technologies
• Magnetic recording
• Nanomagnets
• Relaxation of the magnetization
• Reversal time
• Superparamagnetism
• Tunnelling

Programme(s)

• FP7-PEOPLE - Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)

Topic(s)

• FP7-PEOPLE-IRSES-2008 - Marie Curie Action "International Research Staff Exchange Scheme"

Call for proposal

FP7-PEOPLE-IRSES-2008
See other projects for this call

Funding Scheme

MC-IRSES - International research staff exchange scheme (IRSES)

Coordinator

UNIVERSITE DE PERPIGNAN

• EU contribution: € 50 400,00
• Address: AVENUE PAUL ALDUY 52 ; 66860 Perpignan ; France
• Region: Occitanie › Languedoc-Roussillon › Pyrénées-Orientales
• Activity type: Higher or Secondary Education Establishments
• Total cost: No data