NANOMAGNETS

Mesoscale Quantum Dissipation with Applications to Nanotechnolgy

Coordinatore	UNIVERSITE DE PERPIGNAN    more  Organization address address: AVENUE PAUL ALDUY 52 city: PERPIGNAN postcode: 66860 contact info Titolo: Ms. Nome: Nathalie Cognome: Pellegrin-Longuemard Email: send email Telefono: 00 33 4 68 66 20 67 Fax: 00 33 4 68 66 22 46
Nazionalità Coordinatore	France [FR]
Totale costo	0 €
EC contributo	50˙400 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-IRSES-2008
Funding Scheme	MC-IRSES
Anno di inizio	2009
Periodo (anno-mese-giorno)	2009-02-01   -   2012-01-31

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	UNIVERSITE DE PERPIGNAN  Organization address address: AVENUE PAUL ALDUY 52 city: PERPIGNAN postcode: 66860 contact info Titolo: Ms. Nome: Nathalie Cognome: Pellegrin-Longuemard Email: send email Telefono: 00 33 4 68 66 20 67 Fax: 00 33 4 68 66 22 46	FR (PERPIGNAN)	coordinator	50˙400.00

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 Obiettivo del progetto (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.'