Patent ID: 8072365

Claim:
A magnetic crystal for use in an electromagnetic wave absorbing materials having absorbing capability in a high frequency band of 25 to 160 GHZ, the magnetic crystal having a structure of Îµ-M x Fe 2-x O 3 with 0<x<1, and further having the same space group as that of an Îµ-Fe 2 O 3 crystal and in which M is substituted for a portion of the Fe sites of the Îµ-Fe 2 O 3 crystal; wherein M is a trivalent element having an effect of lowering a coercive force Hc of the magnetic oxide comprising an Îµ-Fe 2 O 3 crystal when M is substituted for a portion of the Fe sites of the Îµ-Fe 2 O 3 crystal.