Single ion magnets as magnetic probes of internal field in microparticle array

There is a variety of transition metal and lanthanide complexes, which exhibit properties typical of Single Ion Magnets (SIMs) only in the presence of external DC magnetic field (the so-called field induced SIMs). Here we propose composite material, in which powder sample of field induced SIM based on the recently reported hexacoordinated Co(II) complex is mixed with ferromagnetic microparticles (MPs). Controllable residual magnetic field of MPs acts as internal magnetic field suppressing quantum tunneling of magnetization and making it possible to observe slow magnetic relaxation in the cobalt complex even in the absence of external magnetic field.

Automated summary

By mixing powder samples of hexacoordinated Co(II) complex with ferromagnetic microparticles, a composite material is proposed to observe slow magnetic relaxation in cobalt complex even without external magnetic field, utilizing the controllable residual magnetic field of microparticles to suppress quantum tunneling of magnetization.