The invention relates to a ferrite material with a hexaferrite structure, characterised by the following formula : A1-xByCZDtCuvFel2-WOl9 with 2(x-z-v) + 3(w-y) - 4t = 0, A = Ba, Sr, Ca or Pb, B = Al, Cr, Ga, Bi, B, La, Y or a rare earth, C = Co, Zn, Cd, Ni, Mg or Mn, D = Ti, Sn, Zr, Si, Ge, where 0
