Abstract
Static polarization echoes of metallic powders placed in static magnetic fields are investigated. It is found that the stability of echoes is strongly affected by the atmospheric pressure of helium gas at 4.2 K, and most results are similar in nature to those of piezoelectric powders. These facts indicate that the process involves the macroscopic and mechanical reorientation of individual particles but not the phenomena inside the particles. An echo formation mechanism is proposed in the framework of the torque-rotation model, in which the base axis of rotation is specified by the anisotropic dipole moment caused by the current associated with the mechanical oscillation of particles.
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