Ferrimagnetic ringMn6R6in megagauss fields

Spin dynamics in a molecular ferrimagnetic ring,

“…1 show the curves using the fitting parameters A ¼ 2:0 Â 10 12 ðrad=sec 2 Þ, C ¼ 1:5 ðMHz=K 3 Þ, and D ¼ 0:10 (K). Although these are the best fitting curves, they deviate from the experimental data about 10 K. Since the gap energy between the ground state with S ¼ 12 and the excited state with S ¼ 13 is about 120 K [2], the deviation is not due to the influence of the unconsidered excited states. One may think that fairly better curve will be obtained if more detailed spin-phonon interaction model is introduced.…”

“…It consists of six Mn 2þ ions with s ¼ 5 2 and six NITPh radicals with s ¼ 1 2 , which align alternately with the antiferromagnetic exchange interaction of J$60 K [1][2][3]. The ground state of the ring has a total spin S ¼ 12.…”

Field‐induced phase transitions (FIPT) in molecular magnets

“…The Faraday method has been applied to measure the second order magnetic phase transitions. A number of magnetic materials were studied with the method: first order phase transitions in RCo 2 compounds, second order transitions in KMnF 3 , MnF 2 and steplike magnetization process (transition from ferrimagnetic to ferromagnetic phase) in some molecular magnets -Mn 12 Ac, Mn 6 Rad 6 and V 15 . …”

“…The experimental results has allowed us to reveal the values of the important parameters of exchange interactions within the molecule. Another example of the mesoscopic family is a ring ferrimagnet Mn 6 Rad 6 studied in [15]. The experimental magnetization vs magnetic field curve and a relevant Hamiltonian describing the molecule's properties best of all is presented in [16].…”

“…7 Mesoscopic ferrimagnet V 15 The last application of the megagauss technique we will speak about is a study of a V 15 molecular magnet. Its unique feature is that it has the Kramers doubly degenerate ground state and nevertheless some kind of the macroscopic quantum tunneling was observed on it [17].…”