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The effect of the ferromagnetic metal layer on tunnelling conductance and magnetoresistance in double magnetic planar junctions
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Based on the free-electron approximation,we investigate the effect of the ferromagnetic metal layer on the tunnelling magnetoresistance(TMR) and tunnelling conductance(TC)in the double magnetic tunnel junctions(DMTJs) of the structure NM/FM/I(S)/NM/I(S)/FM/NM,where FM,NM and I(S) represent the ferromagnetic metal,nonmagetic metal and insulator(Semiconductor),respectively,The FM,I(S)and inner NM layers are of finite thickness,while the thickness of the outer NM layer is infinite.The calculated results show that,due to the spin-dependent interfacial potential barriers caused by electronic band mismatch between the various magnetic and nonmagnetic layers,the dependences of the TMR and TC on the thicknesses of the FM layers exhibit oscillations,and a much higher TMR can be obtained for suitable thicknesses of FM layers. 相似文献
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The quantum tunnelling radiation of Schwarzschild de Sitter black hole with a global monopole 总被引:1,自引:0,他引:1
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Applying Parikh's quantum tunnelling method, this paper has studied the quantum
tunnelling radiation of Schwarzschild de Sitter black hole with a global monopole.
The result shows that the tunnelling rates at the event horizon and the cosmological
horizon are related to Bekenstein--Hawking entropy and the derived radiation
spectrum is not precisely thermal when considering energy conservation and
self-gravitation interaction. 相似文献
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扫描隧道显微镜是利用探针尖端与物质表面原子间的不同种类的局域相互作用,来测量表面原子结构和电子结构的显微新技术,它的出现被科学界誉为是表面科学和表面现象分析技术的一次革命。 相似文献