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伊藤 華苗; 原田 雅史*; 山田 悟史*; 工藤 憲治*; 青木 裕之; 金谷 利治*
Langmuir, 36(43), p.12830 - 12837, 2020/11
被引用回数：17 パーセンタイル：50.33(Chemistry, Multidisciplinary)We performed H
O and DO double contrast neutron reflectivity measurements on 
25-nm-thick Nafion thin films on hydrophilic and hydrophobic carbon in water and 80% relative humidity vapor to investigate the depth profile of the water and Nafion distribution. We found a dense Nafion layer at the air or water interface regardless of the carbon hydrophilicity. On the other hand, a water-rich Nafion dense layer was observed at the carbon interface only for hydrophilic carbon. The double contrast measurements provided quantitative information about the depth profile but simultaneously indicated that the sum of the volume occupancies of water and Nafion in the film was less than unity. We assessed the problem based on two possibilities: voids in the film or "residual water", which cannot be exchanged or is difficult to exchange with water outside.
Gu, B.
no journal, ,
Magneto-optical Kerr effect (MOKE) is the phenomenon in which the light reflected from a magnetized material has a rotated plane of polarization. The MOKE originates from spin-orbit coupling in materials, and the effect has played a significant role in the rapidly developing field of spintronics. For applications to magneto-optical devices, a large MOKE is required. By density functional theory calculations, we have found an enhanced MOKE at Fe/insulator interfaces. Our study indicates that interfacial Fe atoms in the Fe films have a low-dimensional nature, which causes the following two effects: (1) The diagonal component of the optical conductivity decreases dramatically because the hopping integral for electrons between Fe atoms is suppressed by the low dimensionality. (2) The off-diagonal component of the optical conductivity does not change at low photon energies, but it is enhanced at photon energies around 2 eV, where we obtain enhanced orbital magnetic moments and spin-orbit correlations for the interfacial Fe atoms. Our findings indicate an efficient way to enhance the effect of spin-orbit coupling at metal/insulator interfaces without using heavy elements.
