スピン走査トンネル顕微鏡によるナノメートルスケール磁化状態評価

概要

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We have developed spin-polarized scanning tunneling microscopy for magnetic imaging with nanometer-scale resolution. Using normalized-differential conductivity, the magnetic signal is obtained as the product of the spin-polarization of the system and the angle between the two magnetic directions of the tip and sample. For Co(0001) surfaces, the maximum magnetic contrast of 〜23% is achieved at bias voltages corresponding to a Co(0001) minority-spin surface state. Images of the magnetic contrast obtained on the Co island films showed domain structures depending on each island element. Since a narrow domain wall with a width of 4 nm is observed in the images, the spatial resolution of this method is estimated to be less than a few nanometers.
社団法人日本磁気学会の論文
2002-07-01