Microwave coupled electron tunneling measurement of Co nanoparticles

Details Microwave coupled electron tunneling measurement of Co nanoparticles Microwave coupled electron tunneling measurement of Co nanoparticles

2011-06-28

arxiv.org/abs/1106.5809v1

Appl. Phys. Lett. 99, 032510 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 5 figures

Scientific paper

10.1063/1.3614554

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 10{\mu}s 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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