Fig. 3: µSQUID loops EPR.
a Magnetisation curves as a function of the frequency of the RF source obtained while sweeping the magnetic field with a fixed sweeping rate of 8 mT/s and by applying pulses of 40 μs width and 300 μs period. b Resonant maps obtained by sweeping along the easy axis with a constant sweeping rate of 8 mT/s and applying RF pulses with 40-μs width every 300 μs. The labels correspond to (m,m′) transitions (see the main text). c Linear fit of the resonance map by using: g = 1.96, \({B}_{2}^{0}\) = −6.83 × 10−1 GHz, \({B}_{4}^{0}\) = −1.5 × 10−3 GHz, \({B}_{6}^{0}\) = 1.6 × 10−8 GHz obtained from Eqs. 7–9. (m, m ± 1) dipolar transitions are shown as black lines superimposed on the resonance map. d Zeeman diagram with marked level anticrossing, according to the selection rules: ∆m = 4 (blue), ∆m = 6 (green), ∆m = 5 (yellow), and ∆m = 3 (red).
