  Presented are magnetization measurements on a crystal of Fe8 single-molecule
magnets using a Hall probe magnetometer. Irradiation with microwaves at
frequencies of 92 and 110-120 GHz leads to the observation of electron
paramagnetic resonance (EPR) detected via magnetization measurements. A
quantitative analysis of the results are introduced by means of the spin
temperature. It is shown that pulsed microwave experiments allow a better
control over the spin excitation.
