Abstract
Sandwich magnetic films of Nd2Fe14B/Fe/Nd2Fe14B have been grown by a KrF excimer laser (λ=248 nm) ablation technique. Magnetic properties were characterized by varying the thickness and volume fraction of hard (Nd2Fe14B) and soft (Fe) magnetic layers. In the (y)nm[NdFeB]/(x)nm[Fe]/(y)nm[NdFeB]/(100)Si structure, the thickness (y) varied from 3.6 to 54 nm, and (x) from 15 to 112 nm. At (x)=15–23 nm where the volume fraction of Fe corresponded to 51–75%, the sandwich structure exhibited an enhanced Mr/Ms and Hci from the result of the exchange coupling between the magnetic layers. Experimentally calculated exchange constant (As) of As=2.5×10−10 J/m was estimated using the measured thickness (tcs) and reference crystalline anisotropy constant (Kh) of Nd2Fe14B crystal.
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