The rectifying effect of a constant-wave radio frequency (rf) current by a magnetic domain wall (DW) in a single-layered ferromagnetic wire is presented. A direct-current (dc) voltage is generated by the spin torque diode effect, which is a consequence of magnetoresistance oscillation due to the resonant spin wave excitation induced by the spin-polarized rf current. The dc voltage spectrum strongly depends on the internal spin structure in the DW, which corresponds to the magnetic fingerprint of the spin structure in the ferromagnetic wire.
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