唯一的挑战是，如何提取自旋来形成一个自旋极化的电流，然后注入到电路中并保持极化在沿途不发生退化。
The challenge, however, is extracting the spins to form a spin-polarized current and injecting them into a circuit without the polarization degrading along the way.
其中的一部分电子穿过DNA“森林”后，注入一个可以测量其自旋极化率的仪器中。
Some of these electrons travel through the DNA forest and are fed into a device that measures their spin polarization .
研究了电子的自旋相关的隧穿和极化。
The electron spin dependent tunneling and susceptibility are studied.
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