High-temperature slow relaxation of the magnetization in Ni10 magnetic molecules |
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Authors: | Carretta S Santini P Amoretti G Affronte M Candini A Ghirri A Tidmarsh I S Laye R H Shaw R McInnes E J L |
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Institution: | Dipartimento di Fisica, Università di Parma, I-43100 Parma, Italy. |
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Abstract: | We investigate a family of molecular crystals containing noninteracting Ni10 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. Ni10 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. |
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