Arrays of s u b~c~n Go rectangular dots with the aspect ratio ranging from 1 to 4 and antidots with the tion measurements show that Go dots are well controlled hereas the antidots exhibit field d i~c~i o n .
The in-plane magnetic easy-axis reorientation was investigated for the arrays of (10⋅0) hcp Co rectangular dots 0.2 μm in width with a variable length from 3 to 5 μm perpendicular to the c axis. In the system, the magnitude of the shape anisotropy contribution is determined by a lateral aspect ratio of the dot, while the magnetocrystalline anisotropy contribution is temperature dependent. The torque curves for the dot arrays exhibited a characteristic fourfold symmetry due to the easy-axis reorientation. The reorientation angle from the initial easy axis was found to be dependent on the value of in-plane demagnetization factors as well as the temperature variable first and second magnetocrystalline anisotropy constants. The experimental results are in good agreement with the calculated effective magnetic anisotropy.
In this report, we describe the results of a survey on the concentrations of radioactive Cs (R-Cs) in forest floor soils and leaves of trees in the forests, from 7 to 9 years after the accident at the Fukushima Daiichi Nuclear Power Plant (FDNPP). The survey areas were three natural forests mainly composed of deciduous broad-leaved trees in the Iitate village, Fukushima Prefecture. More than 7 years after the FDNPP accident, relatively higher concentrations of 137 Cs have been detected in leaves of deciduous broad-leaved trees, despite the concentrations of 137 Cs becoming established in the soil surface layer, particularly immobilized in frayed edge sites within clay minerals. From 2018 to 2020, the annual flux of 137 Cs in the litterfall in the Shimohiso survey area was estimated to be about 5.2 kBq•m −2 •year −1 . In this survey area, the circulation of R-Cs is still active at a level comparable to and observed in the litterfall produced in the coniferous forest after the FDNPP accident.
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