Interaction of superconducting microparticles with molecular magnet in their composite

Abstract

Changes in frequency of magnetic relaxation in single-molecular magnet (SMM) [Er(HL) (L)]•4CHCl3·H2O (where L = DAPBH = 2,6-bis(phenylhydrazone)pyridine) deposited on In microparticles surfaces in In-SMM composite have been found. Single-ion magnets impressed in between superconductive In microballs demonstrate a strong shift in relaxation frequency as indium enters a superconducting state below the critical temperature. Transition to a superconductive state in matrix provides changes in spin relaxation in SMM. An inverse effect consists in changes in magnetic susceptibility of an In matrix, when intramolecular states in Er3+ are switched by external magnetic field. Structural changes in SMM under compression as well as change in electronic states result in tuning of frequency window of magnetic relaxation. Voltaic reading of magnetic information recorded in nanosized SMM arrays distributed around superconductive particles becomes possible.