57 research outputs found
Problem of Fenchel on the complex projective plane and representations of the 3rd braid group (Fundamental Groups and Algebraic Functions)
Spin current generation from an epitaxial tungsten dioxide WO
We report on efficient spin current generation at room temperature in rutile
type WO grown on AlO(0001) substrate. The optimal WO
film has (010)-oriented monoclinically distorted rutile structure with metallic
conductivity due to 5 electrons, as characterized by x-ray
diffraction, electronic transport, and x-ray photoelectron spectroscopy. By
conducting harmonic Hall measurement in NiFe/WO bilayer, we
estimate two symmetries of the spin-orbit torque (SOT), i.e., dampinglike (DL)
and fieldlike ones to find that the former is larger than the latter. By
comparison with the NiFe/W control sample, the observed DL SOT
efficiency of WO (+0.174) is about two thirds of that of W
(-0.281) in magnitude, with a striking difference in their signs. The magnitude
of the of WO exhibits comparable value to those of widely
reported Pt and Ta, and Ir oxide IrO. The positive sign of the
of WO can be explained by the preceding theoretical study
based on the 4 oxides. These results highlight that the epitaxial
WO offers a great opportunity of rutile oxides with spintronic
functionalities, leading to future spin-orbit torque-controlled devices.Comment: 14 pages, 4 figure
Spin-orbit torque generation in bilayers composed of CoFeB and epitaxial SrIrO grown on an orthorhombic DyScO substrate
We report on the highly efficient spin-orbit torque (SOT) generation in
epitaxial SrIrO(SIO), which is grown on an orthorhombic DyScO(110)
substrate. By conducting harmonic Hall measurement in
CoFeB (CoFeB)/SIO bilayers, we characterize two kinds of
the SOTs, i.e., dampinglike (DL) and fieldlike ones to find that the former is
much larger than the latter. By comparison with the Pt control sample with the
same CoFeB thickness, the observed DL SOT efficiency of SIO
(0.32) is three times higher than that of Pt (0.093). The
is nearly constant as a function of the CoFeB thickness,
suggesting that the SIO plays a crucial role in the large SOT generation. These
results on the CoFeB/SIO bilayers highlight that the epitaxial SIO is promising
for low-current and reliable spin-orbit torque-controlled devices.Comment: arXiv admin note: text overlap with arXiv:2305.1788
Effect of interface quality on spin Hall magnetoresistance in Pt/MgFe2O4 bilayers
Sugino M., Ueda K., Kida T., et al. Effect of interface quality on spin Hall magnetoresistance in Pt/MgFe2O4 bilayers. Applied Physics Express 17, 013003 (2024); https://doi.org/10.35848/1882-0786/ad0ba4.We report on spin Hall magnetoresistance (SMR) in bilayers composed of Pt and magnetic insulator MgFe2O4 (MFO) with spinel structure. The Pt thickness dependence of the SMR reveals that annealing of the MFO surface before depositing the Pt layer is crucial for a large SMR with better interface quality. We also found that oxygen pressure during the MFO growth hardly affects the SMR, while it influences the magnetic property of the MFO film. Our findings provide important clues to further understanding the spin transport at interfaces containing magnetic insulators, facilitating development of low power consumption devices
手書き文字の感性印象と筆跡から推測されたおよび実際の書き手のパーソナリティ特性との関連について
Handwriting samples of a given Japanese text were collected from female student participants (N=50). Affective impressions regarding the appearance of the handwriting samples were assessed using the Semantic Differential technique. A factor analysis revealed three dimensions of impressions about handwriting, which were semantically similar to the dimensions of person perception. Another panel of female students inferred the big-five personality traits of the writers from the handwriting samples. All inferred personality traits were moderately or strongly correlated with at least one dimension of the impressions about handwriting. However, there were no satistically significant correlations between the dimensions of impressions about the handwriting and the writer\u27s actual personality traits as assessed by the Big-Five Scales. The process and the fallaciousness of naive graphological inferences are discussed
Robotic CT-guided out-of-plane needle insertion: comparison of angle accuracy with manual insertion in phantom and measurement of distance accuracy in animals
Objectives
To evaluate the accuracy of robotic CT-guided out-of-plane needle insertion in phantom and animal experiments.
Methods
A robotic system (Zerobot), developed at our institution, was used for needle insertion. In the phantom experiment, 12 robotic needle insertions into a phantom at various angles in the XY and YZ planes were performed, and the same insertions were manually performed freehand, as well as guided by a smartphone application (SmartPuncture). Angle errors were compared between the robotic and smartphone-guided manual insertions using Student’s t test. In the animal experiment, 6 robotic out-of-plane needle insertions toward targets of 1.0 mm in diameter placed in the kidneys and hip muscles of swine were performed, each with and without adjustment of needle orientation based on reconstructed CT images during insertion. Distance accuracy was calculated as the distance between the needle tip and the target center.
Results
In the phantom experiment, the mean angle errors of the robotic, freehand manual, and smartphone-guided manual insertions were 0.4°, 7.0°, and 3.7° in the XY plane and 0.6°, 6.3°, and 0.6° in the YZ plane, respectively. Robotic insertions in the XY plane were significantly (p
Conclusion
Robotic CT-guided out-of-plane needle insertions were more accurate than smartphone-guided manual insertions in the phantom and were also accurate in the in vivo procedure, particularly with adjustment during insertion
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