Title :
Magnetic properties of Co2Y-type hexaferrite particles oriented in a rotating field
Author :
Obol, M. ; Vittoria, C.
Author_Institution :
Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA
Abstract :
Cobalt Y-type hexaferrites are of interest as high permeability μ materials in the miniaturization of integrated circuits. We oriented particles of sintered Co2Y-type hexaferrite with c-axis normal to the slab plane. We measured the magnetic properties of Co substituted Y-type hexaferrites (Co0.25Zn1.75Y and Mn0.25Co0.75Zn1.0), where the substitutions included Mn and Zn. The uniaxial magnetic anisotropy field, HA, decreased from 42 to 14.5 kOe as Zn substitution increased at the expense of Co. The ferromagnetic resonance linewidth exhibited similar dependence on Zn substitution varying from 1500 to 200 Oe at 28 GHz. For all the Zn or Mn substitutions, the saturation magnetization was relatively constant at 2000 G.
Keywords :
cobalt compounds; ferrites; ferromagnetic resonance; magnetic anisotropy; magnetic particles; magnetic permeability; magnetisation; manganese compounds; microwave materials; zinc compounds; 28 GHz; Co substituted Y-type hexaferrites; Co0.25Zn1.75Fe2O4; Co0.25Zn1.75Y; Co2Y-type hexaferrite particles; Mn0.25Co0.75Zn1.0; Mn0.25Co0.75Zn1.0Fe2O4; Zn substitution; c-axis; cobalt Y-type hexaferrites; ferromagnetic resonance linewidth; high permeability materials; magnetic properties; microwave hexaferrites; rotating field; saturation magnetization; sintered hexaferrite; uniaxial magnetic anisotropy; Cobalt; Integrated circuit measurements; Magnetic anisotropy; Magnetic materials; Magnetic properties; Magnetic resonance; Permeability; Saturation magnetization; Slabs; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.816019
