Normally Electron Paramagnetic Resonance is measured by measuring the absorption of the microwaves. In some conducting samples the absorption of resonant spins can be measured by detecting a change in electrical conduction when resonant microwaves are applied to the sample. This technique is then typically referred to as Electrically Detected Magnetic Resonance (EDMR). A necessary ingredient is a spin dependent conduction pathway, but it can greatly enhance the sensitivity, and single spin detection has been observed in select cases. The high electron spin polarization and a setup without resonator make this technique especially efficient at high frequencies and fields.
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