Abstract
A resonance-echo effect not involving nuclear spins in magnetically ordered materials has been investigated at radio frequencies. The echo amplitudes and relaxation properties have been studied by varying the temperature, frequency, rf intensity, and external static magnetic field for several magnetic conductors and insulators. In a zero external magnetic field, the echoes occur throughout the available frequency range (5–110 Mc/sec) and relax exponentially with relaxation times roughly inversely proportional to temperature or applied frequency through most of the range of either parameter. With an external field they exhibit peaks in amplitude vs field strength. Physical mechanisms which possibly produce these effects (domain wall motion or intradomain ferromagnetic resonance modes) are discussed.
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