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The local magnetic field distribution on the subsurface of a single-moleculemagnet crystal, SMM, above blocking temperature (T >> Tb) detected for a veryshort time interval (~ 10-10 s), has been investigated. Electron ParamagneticResonance (EPR) spectroscopy using a local paramagnetic probe was employed as asimple alternative detection method. An SMM crystal of[Mn12O12(CH3COO)16(H2O)4].2CH3COOH.4H2O (Mn12-acetate) and a crystal of 2,2-diphenyl-1-picrylhydrazyl (DPPH) as the paramagnetic probe were chosen for thisstudy. The EPR spectra of DPPH deposited on Mn12-acetate show additionalbroadening and shifting in the magnetic field in comparison to the spectra ofthe DPPH in the absence of the SMM crystal. The additional broadening of theDPPH linewidth was considered in terms of the two dominant electron spininteractions (dipolar and exchange) and the local magnetic field distributionon the crystal surface. The temperature dependence of the linewidth of theGaussian distribution of local fields at the SMM surface was extrapolated forthe low temperature interval (70-5 K).

journal of applied physics

Study of the local field distribution on a single-molecule magnet-by a  single paramagnetic crystal; a DPPH crystal on the surface of an Mn12-acetate  crystal