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arXiv 1106.5809cond-mat.mes-hall
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Co纳米粒子的微波耦合电子隧穿测量

Microwave coupled electron tunneling measurement of Co nanoparticles

W. Jiang, F. Tijiwa Birk, D. Davidović

摘要:

我们研究了在4.2K温度下,在重复微波脉冲作用下,电子在Co纳米粒子中的隧穿。当单个脉冲太弱而不能影响磁开关场时,重复的微波脉冲在10μs间隔处开始降低磁开关场。利用I-V曲线作为温度计,表明微波脉冲并不加热样品,说明Co纳米颗粒的磁化是由微波脉冲直接激发的,其激发能的弛豫时间在微秒级。

英文摘要:

We study electron tunneling through Co nanoparticles in the presence of repeated microwave pulses at 4.2K. While individual pulses are too weak to affect the magnetic switching field, repeated microwave pulses start to reduce the magnetic switching field at 10μs spacing. We use I-V curve as a thermometer to show that the microwave pulses do not heat the sample, showing that magnetization in Co nanoparticles is directly excited by microwave pulses, and the relaxation time of the excitation energy is in the range of microsecond.

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