Abstract
Sandwich structures of Nd 2Fe 14B/Fe/Nd 2Fe 14B magnetic films have been grown by a KrF excimer laser ( λ=248 nm) ablation technique. Magnetic properties were characterized by varying the thickness of hard (Nd 2Fe 14B) and soft (Fe) magnetic films and the volume fraction as well. In the ( x) nm [NdFeB]/( y) nm [Fe]/( x) nm [NdFeB]/(1 0 0)Si structure the thickness ( x) was varied from 3.6 to 54 nm, and ( y) from 15 to 112 nm. At ( y)=15–20 nm where the volume fraction of Fe corresponded to 61–75%, the sandwich structure exhibited an enhanced M r/ M s and i H c as well from the result of the exchange coupling between the magnetic layers. Experimentally calculated exchange constant ( A s) of A s=2.5×10 −10 J/m was estimated using the intrinsic coercivity ( i H c ) of 1.2 kOe at 5 K for the sandwich magnetic trilayers.
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