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Cryogenic magnetocaloric effect in the Fe17 molecular nanomagnet

Authors :: Euan K. Brechin
Marco Evangelisti
Ian A. Gass
Ministerio de Economía y Competitividad (España)
Engineering and Physical Sciences Research Council (UK)
Leverhulme Trust
Source :: Gass, I A, Brechin, E K & Evangelisti, M 2013, ' Cryogenic magnetocaloric effect in the Fe17 molecular nanomagnet ', Polyhedron, vol. 52, pp. 1177-1180 . https://doi.org/10.1016/j.poly.2012.06.049, Digital.CSIC. Repositorio Institucional del CSIC, instname
Publication Year :: 2013
Publisher :: Elsevier, 2013.
Abstract: Trabajo presentado al "The 23rd IIR International Congress of Refrigeration" celebrado del 21 al 26 de Agosto del 2011 en Praga.-- Dedicated to Alfred Werner on the 100th Anniversary of his Nobel prize in Chemistry in 1913.<br />We study the magnetothermal properties of magnetically isotropic high-spin molecular nanomagnets containing 17 Fe3+ ions per molecule linked via oxide and hydroxide ions, packed in a crystallographic cubic symmetry. Low-temperature magnetization and heat capacity experiments reveal that each molecular unit carries a net spin ground state as large as S = 35/2 and a magnetic anisotropy as small as D = −0.023 K, while no magnetic order, purely driven by dipolar interactions, is to be expected down to very-low temperatures. These characteristics suggest that the Fe17 molecular nanomagnet can potentially be employed as a sub-Kelvin magnetic refrigerant.<br />This work has been partially supported by Spanish MINECO through grants MAT2009-13977-C03 and PIE201060I012, the EPSRC and The Leverhulme Trust (UK).