As a quasi-layered ferrimagnetic material, Mn\(_3\)Si\(_2\)Te\(_6\) nanoflakes exhibit magnetoresistance behaviour that is fundamentally different from their bulk crystal counterparts. They offer ...three key properties crucial for spintronics. Firstly, at least 10^6 times faster response comparing to that exhibited by bulk crystals has been observed in current-controlled resistance and magnetoresistance. Secondly, ultra-low current density is required for resistance modulation (~ 5 A/cm\(^2\)). Thirdly, electrically gate-tunable magnetoresistance has been realized. Theoretical calculations reveal that the unique magnetoresistance behaviour in the Mn\(_3\)Si\(_2\)Te\(_6\) nanoflakes arises from a magnetic field induced band gap shift across the Fermi level. The rapid current induced resistance variation is attributed to spin-orbit torque, an intrinsically ultra-fast process (~nanoseconds). This study suggests promising avenues for spintronic applications. In addition, it highlights Mn\(_3\)Si\(_2\)Te\(_6\) nanoflakes as a suitable platform for investigating the intriguing physics underlying chiral orbital moments, magnetic field induced band variation and spin torque.
Summary form only given, as follows. With the folding target and double-step target, the propagating characters of shock wave directly driven by inclined-incident laser were studied on Shenguang-II ...high power laser facility. The results indicated that the shock wave in target still propagates along with the vertical direction of target's surface. Also the same result was verified indirectly by another experiment based on the measurement for spatial intensity distribution of X-ray radiated from jet plasmas. Using the three-beams of basic frequency from Shenguang-II and beam smoothing technology of lens-array, the shock wave with a better planarity in the target was created after optimum design and rational combination for laser beam, the region of shock planarity is about (650-750) /spl mu/m the shock wave with a better planarity in the target which was heated by the thermal radiation from a laser-healed cavity ( D-shaped and T-shaped) was also obtained. Moreover, equation of state points on the principal Hugoniot of Cu at multimegabar pressure were measured by both directly and indirectly driven, and compared with data from other methods. And the dynamic characters of a flyer were investigated experimental for the first time by a special flyer-inclined target.
Seventy-eight patients with an untreated rectal cancer were randomly divided into two groups A and B. To 40 cases of Group A, the radiotherapy was received first, and then, in thirty minutes, the ...intracavitary hyperthermia using 915 MHz microwave was given in twice a week. The dosage selected for the radiotherapy were severally 30Gy/3 weeks and 40Gy/4 weeks. In Group A (combined treatment) CR and PR were observed in 57.5% and 32.5%. As compared with it, in Group B (radiotherapy alone) CR and PR were seen in only 5.3% and 26.3%. In both groups the radical resection was performed after preoperative procedures, and the combined effect between radiotherapy and hyperthermia was confirmed histologically.
118 specimens of rectal cancer were studied pathologically. 40 cases were treated by both preoperative radiotherapy and intracavitary hyperthermia (group 1), 38 treated by preoperative radiotherapy ...alone (group 2) and 40 by operation alone (group 3). The tumor disappearance rates by gross observation were 57.5% and 5.3% in groups 1 and 2 (P less than 0.001). The moderate to severe damage of cancer cells (X2-X4) was observed in 90% of cases in group 1 and 31.6% in group 2 (P less than 0.05). In the former, the cancer cell disappearance was observed in 8 cases, while in the latter, only 1 case. The cell degenerations by 30 Gy plus hyperthermia were similar to those by 40 Gy plus hyperthermia, but both were more marked than by 30 Gy alone or 40 Gy alone (P less than 0.05). The lymphocyte, plasma cell infiltration and hyperplasia of fibrous tissue around the tumor in group 1 were more marked than those in groups 2 and 3 (P less than 0.05). The thrombosis around the tumor was more in group 1 than in group 2 (P les
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