Spin-enhanced magnetocaloric effect in molecular nanomagnets

Details Spin-enhanced magnetocaloric effect in molecular nanomagnets Spin-enhanced magnetocaloric effect in molecular nanomagnets

2005-07-18

arxiv.org/abs/cond-mat/0507407v1

Appl. Phys. Lett. 87, 072504 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, accepted for publication in Applied Physics Letters

Scientific paper

10.1063/1.2010604

An unusually large magnetocaloric effect for the temperature region below 10 K is found for the Fe14 molecular nanomagnet. This is to large extent caused by its extremely large spin S ground-state combined with an excess of entropy arising from the presence of low-lying excited S states. We also show that the highly symmetric Fe14 cluster core, resulting in small cluster magnetic anisotropy, enables the occurrence of long-range antiferromagnetic order below T_N=1.87 K.

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