We investigate a family of molecular crystals containing noninteracting Ni-10 magnetic molecules. We find slow relaxation of the magnetization below a temperature as high as 17 K and we show that this behavior is not associated with an anisotropy energy barrier. Ni-10 has a characteristic magnetic energy spectrum structured in dense bands, the lowest of which makes the crystal opaque to phonons of energy below about 1 meV. We ascribe the nonequilibrium behavior to the resulting resonant trapping of these low-energy phonons. Trapping breaks up spin relaxation paths leading to a novel kind of slow magnetic dynamics which occurs in the lack of anisotropy, magnetic interactions and quenched disorder.

High-temperature slow relaxation of the magnetization in Ni-10 magnetic molecules / Carretta, S; Santini, P; Amoretti, G; Affronte, Marco; Candini, A; Ghirri, A; Tidmarsh, Is; Laye, Rh; Shaw, R; Mcinnes, Ejl. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 97:(2006), pp. 207201-207205. [10.1103/PhysRevLett.97.207201]

High-temperature slow relaxation of the magnetization in Ni-10 magnetic molecules

AFFRONTE, Marco;
2006

Abstract

We investigate a family of molecular crystals containing noninteracting Ni-10 magnetic molecules. We find slow relaxation of the magnetization below a temperature as high as 17 K and we show that this behavior is not associated with an anisotropy energy barrier. Ni-10 has a characteristic magnetic energy spectrum structured in dense bands, the lowest of which makes the crystal opaque to phonons of energy below about 1 meV. We ascribe the nonequilibrium behavior to the resulting resonant trapping of these low-energy phonons. Trapping breaks up spin relaxation paths leading to a novel kind of slow magnetic dynamics which occurs in the lack of anisotropy, magnetic interactions and quenched disorder.
2006
97
207201
207205
High-temperature slow relaxation of the magnetization in Ni-10 magnetic molecules / Carretta, S; Santini, P; Amoretti, G; Affronte, Marco; Candini, A; Ghirri, A; Tidmarsh, Is; Laye, Rh; Shaw, R; Mcinnes, Ejl. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 97:(2006), pp. 207201-207205. [10.1103/PhysRevLett.97.207201]
Carretta, S; Santini, P; Amoretti, G; Affronte, Marco; Candini, A; Ghirri, A; Tidmarsh, Is; Laye, Rh; Shaw, R; Mcinnes, Ejl
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/22733
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