Films of Mn12-acetate deposited by low-energy laser ablation

Abstract

Thin films of the molecular magnet Mn12-acetate, [Mn12 O12(CH3COO)16 (H2O)4] 2CH3COOH 4H2O, have been prepared using a laser ablation technique with a nitrogen laser at low laser energies of 0.8 and 2 mJ. Chemical and magnetic characterizations show that the Mn12-acetate cores remain intact and the films show similar magnetic properties to those of the parent molecular starting material. In addition, the magnetic data exhibit a peak in the magnetization at 27 K indicating the creation of an additional magnetic phase not noted in previous studies of crystalline phases.Comment: 8 pages, 5 figures, In Press - J. Mag. Mag. Ma

Enhanced magnetic anisotropy of Mn12-acetate

“…There are few reports on the film production of Mn 12 derivatives to date [8][9][10][11][12][13][14], and even less reports on the significant enhancement of magnetic properties from that of the parent compound [11,12]. Here we report the production of thin, homogeneous Mn 12 -acetate films of continuous coverage by the dip-and-dry (DAD) method, and the enhancement of the magnetic anisotropy of Mn 12 -acetate, which has undergone similar solvent exposure.…”

“…Single molecule magnets (SMMs), the most studied of which is [Mn 12 O 12 (CH 3 COO) 16 (H 2 O) 4 ]·2CH 3 COOH·4H 2 O (Mn 12 -acetate) [1][2][3][4], provide a model system for the study of quantum tunneling of the magnetization [3]. Stepwise magnetization hysteresis loops and out-of-phase ac susceptibility signals are due to a high spin ground state and a strong uniaxial magnetic anisotropy of Mn 12 -acetate [2], in which eight Mn 3+ (S=2) ions and four Mn 4+ (S=3/2) ions are magnetically coupled by oxygen bridges to form the S=10 ground state [5].…”

Spin density wave and superconducting properties of nanoparticle organic conductor assemblies

“…For instance, in semiconductor devices 1 or type I elemental metal superconductors like aluminum 2,3 the evolution from an insulator to a metal or superconductor is observed with increasing electron density or film thickness, and in nanoparticles of tin 4 or lead 5,6 a modification of the superconducting properties is observed for sizes smaller than the coherence lengths. The single molecule magnet material Mn 12 -acetate has also been produced as a thin film 7 . Although the film retains aspects of the more dramatic magnetic hysteresis effects seen in the bulk crystalline materials, modifications such as an additional magnetic phase also appear.…”

Self-assembled aggregates formed by single-molecule magnets on a gold surface

“…This can be achieved either by functionalizing the cluster so that it may be grafted onto an Au(111) surface 13,14,[20][21][22][23][24] or prefunctionalizing both the substrate and the molecule to encourage the formation of adsorbed layers [25][26][27] . Deposition in UHV using pulsed laser deposition 28 , matrix-assisted pulsed laser evaporation 29 , a pulsed vacuum spray technique 30 and a local mechanical method 31 has also been demonstrated. However, when applied to the formation of Mn 12 (acetate) 16 films, fragmentation and possible damage to the manganese core 30,32 were reported.…”