この論文を読む／探す
抄録
3層の磁性層を有するデュアルスピンバルブ多層膜は[反強磁性層/磁性層]および[磁性層/反強磁性層]の積層順の異なる2種類の積層構造を含む。我々は、上記2種類の積層構造の界面におけるNi-Fe-Co磁性層とFe-Mn反強磁性層との交換結合について検討した。その結果、(1)Ni-Fe-Co磁性層上にFe-Mn反強磁性層を形成した時は、反強磁性層厚が10nm以上になると、交換結合の強さはほぼ一定の値になる、(2)反強磁性層上に磁性層上に磁性層を形成した時は、反強磁性層厚が20nmよりも厚くなると、磁性層・反強磁性層界面の平坦性および反強磁性層のスピン配列が劣化するため、交換結合が急激に低下する、ことが明らかになった。
Dual spin-valve multilayers, with 3 magnetic layers, have structures of both [antiferromagnetic layer/ferromagnetic layer] and [ferromagnetic layer/antiferromagnetic layer]. We investigated the exchange couplings at the two kinds of interfeces between the Ni-Fe-Co ferromagnetic layers and Fe-Mn antiferromagnetic layers. When the Fe-Mn antiferromagnetic layers were formed on the Ni-Fe-Co ferromagnetic layers, the strength of exchange couplings became almost constant at the thicknesses of the antiferromagnetic layers above 10 nm. When the ferromagnetic layers were formed on the antiferromagnetic layers, the roughness of the interface between the ferromagnetic layer and the antiferromagnetic layer increased and the alignment of the spin of the antiferromagnetic layer deteriorated at the thicknesses of the antiferromagnetic layers above 20 nm. These deteriorations decreases the strength of the exchange couplings.
