| 摘要 |
The device for detecting and characterising electron spins in a sample (201) comprises an electromagnetic microresonator (202), having a resonant frequency cor in the microwave range and a quality factor Q and into which the sample (201) is inserted; a device for creating a magnetic field B0 in the sample (201) for bringing a spin transition frequency cos into resonance with the resonant frequency cor, such that cos = yB0, where γ is a gyromagnetic factor of the spins; a spin detection device receiving signals from the electromagnetic microresonator (202) associated with the sample (201) and comprising at least one low-noise amplifier operating at a temperature of between 1 and 10 K and a series of amplifiers and a demodulator operating at ambient temperature. The electromagnetic microresonator (202) is made from superconducting metal and is produced on the nanometre scale, comprising an active area formed by a substantially parallelepiped constriction (220), with a thickness of between 8 and 30 nm, a width of between 10 and 500 nm and a length of between 100 and 5000 nm. The device has improved sensitivity and allows samples of a very small size to be analysed. |
