Frequency-domain terahertz transmission spectra of Mn 3 and Mn 12 single-molecule magnets

Frequency-domain terahertz transmission spectra of Mn3 and Mn12 single molecule magnets (SMMs) have been measured at different temperatures, and hence the anisotropic parameters D 2 and D 4 of the spin Hamiltonian \(\hat H = D_2 \hat S_z^2 + D_4 \hat S_z^4\) have been calculated. For Mn12 SMM, D 2=−10.9 GHz and D 4=−2.59×10−2 GHz, while for Mn3 SMM, D 2=−22.0 GHz and D 4 can be considered negligible. This suggests Mn3 SMM can be considered as a simpler and more suitable candidate for magnetic quantum tunneling research.