Ferromagnetic resonance, or FMR, is a spectroscopic technique to probe the magnetization of ferromagnetic materials. It is a standard tool for probing spin waves and spin dynamics. FMR is very broadly similar to electron paramagnetic resonance (EPR), and also somewhat similar to nuclear magnetic resonance (NMR) except that FMR probes the sample magnetization resulting from the magnetic moments of dipolar-coupled but unpaired electrons whereas NMR probes the magnetic moment of atomic nuclei screened by the atomic or molecular orbitals surrounding such nuclei of non-zero nuclear spin.
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“It is closing time in the gardens of the West and from now on an artist will be judged only by the resonance of his solitude or the quality of his despair.”
—Cyril Connolly (1903–1974)