Method provided with magnetic body and magnetic body sensing device

Abstract

A medium comprises a magnetic body which generates a signal when a magnetic field is applied thereto, wherein the magnetic body has two or more easy magnetization directions and the magnetic body forms information that identifies the medium based on the signal generated when the magnetic field is applied to the magnetic body.

1 . A medium comprising:
 a magnetic body that generates a signal when an alternating magnetic field is applied thereto, wherein   the magnetic body has two or more non-parallel directional axes in which the magnetic body is easy to cause magnetization reversion, wherein each directional axis is with respect to a direction from which the alternating magnetic field is applied;   the magnetic body forms information that identifies the medium based on the signal generated when the alternating magnetic field is applied; and   the alternating magnetic field alternates between a positive magnetic field and a negative magnetic field along the direction from which the alternating magnetic field is applied.   
   
   
       2 . A magnetic body sensing device for sensing a medium provided with a magnetic body that generates a signal when an alternating magnetic field is applied thereto, comprising:
 a coil that applies an alternating magnetic field to the magnetic body provided to the medium,   a detector that detects a signal generated by the magnetic body in response to the alternating magnetic field applied; and   a sensor that senses information formed by the magnetic body based on the signal generated by the magnetic body and detected by the detector,   wherein the magnetic body has two or more non-parallel directional axes in which the magnetic body is easy to cause magnetization reversion, and each directional axis is with respect to a direction from which the alternating magnetic field is applied, and   the alternating magnetic field alternates between a positive magnetic field and a negative magnetic field along the direction from which the alternating magnetic field is applied.   
   
   
       3 . A medium comprising:
 means for identifying the medium based on a signal generated when an alternating magnetic field is applied to the medium irrespective of a relative orientation between an axis of the medium and a magnetic flux direction of the alternating magnetic field,   wherein the medium has two or more non-parallel directional axes in which the medium is easy to cause magnetization reversion, and each directional axis is with respect to a direction from which the alternating magnetic field is applied, and   the alternating magnetic field alternates between a positive magnetic field and a negative magnetic field along the direction from which the alternating magnetic field is applied.   
   
   
       4 . A medium comprising:
 a magnetic body that generates a signal when an alternating magnetic field is applied thereto, wherein   the magnetic body has two or more non-parallel easy magnetization directions along a magnetic element for causing magnetic reversion to the magnetic body;   the magnetic body forms information that identifies the medium based on the signal generated when the alternating magnetic field is applied; and   the alternating magnetic field alternates between a positive magnetic field and a negative magnetic field along the direction from which the alternating magnetic field is applied.