engleski

Study of local field distribution on the surface of single-molecule magnet

Single-molecule magnets (SMMs) are candidates for many applications, such as quantum computation, high-density magnetic data storage and magnetoelectronics. In order to develop these applications, it is important, among others, to investigate when they are in contact with other dissimilar materials because it is expected that their wave functions and/or magnetic fields extend considerably outside the physical structure. This also implies to improve detection of magnetic field on their surface i. e. magnetic field generated by the crystal in the vicinity of its surface. Magnetic properties of SMM at temperatures above blocking temperature, T > TB, can be considered as a superparamagnetic properties. In superparamagnetic systems the observed magnetic behavior strongly depends on the value of the measuring time, tm, of the employed experimental technique with respect to intrinsic characteristic relaxation time, t, of magnetization. Therefore, it can be expected wide variation in the employing time ”window”, which varies from large values as in magnetization measurements (typically 100 s) to the very small ones, like in ac–susceptibility or spectroscopy (10 ns). Detection and estimation of such distribution of local fields on surface at very short time interval (0.1 ns) as a function of orientation of SMM crystal in the external magnetic field by employing paramagnetic probes are in the focus of this presentation.

EPR; Mn12-acetate; DPPH

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