無電解Co-Pめっき膜の皮膜成長と磁気特性

抄録

The growth of microstructure and magnetic properties of electroless Co-P films (30nm-1500nm) deposited on PET films are examined. The influence of film thickness and solution parameters such as the ratio of the concentration of cobalt ion to that of hypophosphite are discussed with respect to the microstructure and coercive force of the films. 1) The coercive force of Co-P films is dependent on film thickness and the maximum coercive force appears to shift to higher film thickness with decreasing the ratio of Co²⁺ to H₂PO₂^- in the solution. 2) The grain size of Co-P films is affected by solution parameters and it increases with increasing Co²⁺/H₂PO₂^- ratio. In all the films investigated, the average grain size develops with increasing film thickness. 3) The observation of the magnetic domain by means of Lorentz method revealed that grains with a diameter of 50-100nm behave as single domain particles and the dependence of coercive force on film thickness can be explained by changes in the magnetization mechanism.