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Jan 04, 2010

Alignment of magnetic anisotropy axes in crystals of Mn12 acetate and Mn12-tBuAc molecular nanomagnets: Angle-dependent ac susceptibility study

Daniel Ruiz-Molina, leader of the Nanostructured Funcional Materials group at CIN2 (CSIC, ICN), together with other researchers from Instituto de Ciencia de Materiales de Aragón and University of Florida published Alignment of magnetic anisotropy axes in crystals of Mn12 acetate and Mn12-tBuAc molecular nanomagnets: Angle-dependent ac susceptibility study on Physical Review B.

They report the results of angular-dependent ac susceptibility experiments performed on two derivatives of Mn12 single-molecular magnets: the well-known Mn12 acetate, which contains disordered acetic acid molecules in interstitial sites of the crystal structure and Mn12-tBuAc, for which solvent molecules are very well ordered in the structure. Their results show (a) that the angular variation is very similar in the two compounds investigated and compatible with a maximum misalignment of the anisotropy axes of less than 3° and (b) that the tunneling rate is faster for the better ordered Mn12-tBuAc compound. These experiments question interstitial disorder as the dominant origin of the thermally activated tunneling phenomenon. 

Alignment of magnetic anisotropy axes in crystals of Mn12 acetate and Mn12-tBuAc molecular nanomagnets: Angle-dependent ac susceptibility study

+ DOI:10.1103/PhysRevB.80.224428