mu Sr study of 1 : 1 complex of bis(hexafluoroacetylacetonate) manganese (II) with diazodi(4-pyridyl)methan as a photo-responsible magnetic coupler

We apply muon spin relaxation (mu SR) technique to study the magnetic behav iors of the photosensitive molecular magnet, 1:1 complexes of bis(hexafluor oacetylacetonate) manganese(II). {Mn(hfac)2} with diazodi(4-pyridyl)methane as a photoresponsible magnetic coupler. The mu SR time spectra have been c ollected before and after laser irradiation as a function of temperature fr om 290 K to 10 K and as a function of irradiation time during 30 hours. Whi le we are not successful in detecting meaningful effects of irradiation at the present stage, we discuss potential usability of mu SR technique to rev eal the expected unconventional feature of the photo-induced magnetic order .