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A paramagnetic crystal of DPPH deposited on the crystal of single molecular magnet ; EPR evidence on proximity effect

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. Thus, at the surface of the SMM crystal one expects time dependent as well as magnetic field depended distribution of magnetic fields. EPR spectroscopy accompanied with a local paramagnetic probe will be employed as an alternative simple detection method. Detection of such local fields on surface at very short time interval (~ 0.1 ns), as well as linewidth anisotropy of probe, as function of orientation of SMM crystal in the external magnetic field are in the focus of this presentation. It is shown that proximity effect arise due to interaction of the local fields with zero field splitting of excited triplet state in DPPH crystal.

molecular magnets; DPPH; proximity effect

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