Magnetic anisotropies of Ho(iii) and Dy(iii) single-molecule magnets experimentally determined via polarized neutron diffraction

Abstract

We present the magnetic anisotropy of two isostructural pentagonal-bipyramidal complexes, [Ln(H2O)5(HMPA)2]I3.2HMPA (HMPA=hexamethylphosphoramide, Ln=Dy, Ho). Using ac magnetic susceptibility measurements, we find magnetic relaxation barriers of 600 K and 270 K...

Multi-Technique Experimental Benchmarking of the Local Magnetic Anisotropy of a Cobalt(II) Single-Ion Magnet

“…In contrast, the local magnetic anisotropy in paramagnetic compounds can be quantified using PND via the site susceptibility model . The method has been successfully used to determine the atomic susceptibility tensors in several SMMs. ,,,,− Recently, the applicability of the method was extended to powder samples (polarized neutron powder diffraction, PNPD), alleviating the demanding need for large single-crystals and time-consuming measurements at multiple crystal orientations. However, this remarkable progress has so far only been exploited on a single occasion to study the atomic susceptibility tensor, without independent verification from the single-crystal method.…”

Experimental and theoretical investigations on three DyIII4 single molecule magnets: structural and magneto-structural correlations

“…A major reason for the enormous interest on SMMs is their potential applications in quantum computing, high-density data storage devices and spintronic devices. 4–6 Enhancements of the effective energy barrier ( U eff ) for the magnetization reversal and the blocking temperature ( T B ) below which magnetization is considered frozen are the key foci of exploration for applications in devices.…”

“…After the report of the slow relaxation of magnetization in a mononuclear Tb III compound, [NBu 4 ][Tb(phthalocyanine) 2 ], with U eff = 230 cm −1 , 1 c and due to the significant magnetic anisotropy associated with most of the lanthanide ions, the focus of attention to obtain better SMMs was shifted since 2003 from 3d clusters 1 a ,2 to 4f and 3d–4f compounds of varying nuclearity (mono/di/oligo/polynuclear); 1 b,c ,3–15 extensive experimental and theoretical ( ab initio ) studies have been made on lanthanide SMMs. It has been understood that mononuclear lanthanide( iii ) compounds in terms of nuclearity and dysprosium compounds in terms of the particular lanthanide, should be more appealing; 1 c ,3 a,b , i ,7 the reason for the latter is the large magnetic anisotropy, large magnetic moment and Kramers doublet ground state associated with Dy III .…”