Enhanced magnetic anisotropy of Mn 12-acetate

Journal of Magnetism and Magnetic Materials (Impact Factor: 1.83). 01/2006; 301(1):31-36. DOI:10.1016/j.jmmm.2005.06.005
Source: arXiv

ABSTRACT Thin films of the single molecule magnet [Mn12O12(CH3COO)16(H2O)4]·2CH3COOH·4H2O (Mn12-acetate) have been fabricated on a Si-substrate by the dip-and-dry method, a simple and robust technique. Atomic force microscopy and X-ray photoelectron spectroscopy characterizations reveal that homogeneous, thin films of a few molecular layers with smoothness at the molecular level are deposited. Significant changes in magnetic properties of Mn12-acetate exposed to the same solvent were observed in zero field-cooled and field-cooled magnetization, as well as AC-susceptibility measurements. The blocking temperature was found to increase to TB>10K at low magnetic fields, indicating an enhanced magnetic anisotropy.

0 0
  • [show abstract] [hide abstract]
    ABSTRACT: The inclusion of manganese-based single-molecule magnets (SMMs) into solvent cast films of poly(methyl methacrylate) (PMMA) or polycarbonate (PC) was found to influence the thermal stability of these polymers. Examination of the thermal decomposition profiles of PMMA films by thermo-gravimetric analysis (TGA) established that increasing weight % of SMM results in both enhancement of the rate of decomposition initiated at “head-to-head” linkages along with suppression of the rate of decomposition initiated at vinylidene chain ends. In the case of PC films, the temperature at which the primary thermal decomposition occurs decreases with increasing weight % of SMM. The extent of these decomposition trends is correlated to the degree of SMM dispersal, as studied by transmission electron microscopy (TEM). Favourable interactions between the ligands coordinated to the SMMs and the polymer or solvent used in film preparation dictated the degree of SMM dispersal, with the ligand–polymer interactions being dominant on the nano-length scale (1–100nm) and ligand–solvent interactions being dominant on the micro-length scale (>100nm).
    Journal of Materials Science 01/2009; 44(11):2805-2813. · 2.16 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: Single molecule magnets (SMM) are a class of molecules exhibiting magnetic properties similar to those observed in conventional bulk magnets, but of molecular origin. SMMs have been proposed as potential candidates for several technological applications that require highly controlled thin films and patterns. Here we present an overview of the most important approaches for thin film growth and micro(nano)-patterning of SMM, giving special attention to Mn(12) based molecules. We present both conventional approaches to thin film growth (Langmuir-Blodgett, chemical approach, dip and dry, laser evaporation), patterning (micro-contact printing, deposition on patterned surface, moulding of homogeneous films) and new methods specifically developed for SMM (lithographically controlled wetting, lithographically controlled de-mixing).
    Physical Chemistry Chemical Physics 03/2008; 10(6):784-93. · 3.83 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: Micro-Raman spectroscopy was employed to investigate the residual strain and oxygen vacancies of BaTiO3-based multilayer ceramic capacitors (MLCCs) with a Ni internal electrode. Strain was found to accumulate around the internal Ni electrodes layers than at other parts of the MLCCs. In addition, the number of oxygen vacancies near the internal Ni electrode was larger than that at any other parts of the MLCCs. These observations clearly show that Raman spectroscopy is extremely useful for evaluating the residual strain and oxygen vacancies in MLCC devices.
    Japanese Journal of Applied Physics 01/2007; 46:7005-7007. · 1.07 Impact Factor

Full-text (2 Sources)

Available from
Feb 5, 2013