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1.在这样的情况下，电导是量子化的，其基本单位对非磁性材料来说为2e2/h，而磁性材料因交换作用提高了自旋简并度为e2/h。在此以前的Ni的弹道输运研究中，就发现了磁电阻的信号随电流与磁场平行或垂直而不同，但这种行为被当做传统的AMR来解释了 2.弹道电导由G=Ne2/h给出，这个数量N在纳米束缚的几何结构中受自旋轨道相互作用的影响比在块材料强的多。自旋与轨道角动量的耦合作用，使其在前者的投影随磁化方向而不同，因而产生了各向异性的效应。这样，通过改变磁化强度方向来改变费米面处能带数量，从而影响弹道电导。 专业词汇可以用汉字代替 谢谢 [ Last edited by 柠檬树 on 2013-3-14 at 16:24 ] |
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3楼2013-03-14 23:24:55
2楼2013-03-14 16:25:29
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没人翻译 给我如色润色 也行啊 谢谢了 急用 And the conductance is quantized in units 2e2/h for non-magnetic materials and in units e2/h for magnetic materials in which the exchange interaction lifts the spin degeneracy. Recent experiments performed on Ni ballistic nanocontacts found a change of sign in the magnetoresistance obtained for the field parallel and perpendicular to the current. This behavior was interpreted and signature of AMR The ballistic conductance is given by G=Ne2/h, where N is the number of open conducting channels. This quantity is affected by the spin-orbit interaction which is known to be much stronger in open and constrained geometries than in bulk materials. The effect is anisotropic because the orbital momentum is coupled to the spin causing its projection to be different depending on the magnetization direction. By changing the magnetization direction one can, therefore, change the number of bands crossing the Fermi energy and thereby affect the ballistic conductance. |
4楼2013-03-15 08:12:37
hookhans
铁杆木虫 (著名写手)
Farmer
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柠檬树: 金币+30, 翻译EPI+1, ★★★★★最佳答案, 给你多的吧 如果版主处理了 我再给你那个帖子的 谢谢哈 2013-03-15 09:16:30
柠檬树: 金币+30, 翻译EPI+1, ★★★★★最佳答案, 给你多的吧 如果版主处理了 我再给你那个帖子的 谢谢哈 2013-03-15 09:16:30
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1) In such circumstances, the conductance is quantized with the unit 2e2/h for the non-magnetic materials. However, the unit for the magnetic materials should be e2/h due to lifting of the spin degeneracy by the exchange interaction. In recent study on the Ni ballistic nanocontacts, it was found that the magnetoresistance signal depends on whether the current and the magnetic field are parallel or perpendicular. Bu this kind of behavior was interpreted as the traditional signature of AMR. 2) The ballistic conductance is given by the equation G=Ne2/h, where the number N is much strongly influenced by the spin-orbit interaction in nano-constrained geometries than that in a bulk material. The coupling between self-spins and the orbital angular momentums results in anisotropic effects because it causes changes of the projection of the former (self-spin) with the magnetization direction. Therefore, the ballistic conductance can be tuned by fashioning (changing) the number of bands on the Fermi surface via. adjudgement of the magnetization direction. |
5楼2013-03-15 09:01:58
