ハーフメタル強磁性トンネル接合の磁気抵抗効果とその伝導物性

概要

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Spin polarization and electronic structure of Co_<90>Fe_<10> were investigated through tunneling magnetoresistance (TMR) effect measurements on the Mn_<80>Ir_<20>/Ni_<80>Fe_<20>/Co_<90>Fe_<10>/SrTiO_3/La_<0.7>Sr_<0.3>MnO_3 junction. This junction was fabricated with half-metallic ferromagneto-LSMO and has a spin-valve type structure. An inverse TMR of 14% was observed at 4.2 K. As the spin polarization of the LSMO is positive, the inverse TMR observed in this junction indicates a negative polarization for Co_<90>Fe_<10> at the interface. The bias dependence of TMR is asymmetric to the applied bias. The band structure calculated with the LMTO-CPA method showed that spin polarization for Co_<90>Fe_<10> is negative at the Fermi level.
社団法人日本磁気学会の論文
2001-04-15