蒸着法で作製したNi-Fe/Mn-(Ni-Fe)積層膜の構造と交換磁気異方性

概要

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The correlation between the microstructure of the antiferromagnetic (AF) layer and the unidirectional anisortopy constant (J_k) measured at room temperature was investigated for Ni-Fe500@90/Mn_<1-x>(Ni-Fe)_x500@90(x=0. 2-0. 5) bilayers. The bilayers were fabricated on the glass substrate with and without a 60-@90-thick Ti buffer layer by the vacuum evaporation method. In the bilayers fabricated directly on the glass substrate, the grain size of the AF layer was about 120 @90 and J_k was about 0. 02 erg/cm^2 in the as-deposited state, when X=0. 2-0. 3. On the other hand, when the Ti bufffer layer was used, the grain size of the AF layer was enlarged to 200 @90 and J_k was enhanced to 0. 06 erg/cm^2. After annealing at 280℃, the J_k value of the bilayer using the Ti buffer layer reached 0. 18 erg/cm^2, which is 1. 5 times larger than without the Ti buffer layer. We concluded that enlargement of the AF grain is one of key factors for enhancing the exchange anisotropy of a ferromagnetic/AF bilayer.
社団法人日本磁気学会の論文
2000-04-15