Development of point-contact spectrometer for spin polarization measurements

M. Shiga, N. Nishimura, H. Takata, Y. Inagaki, H. Kambara, K. Tenya, T. Kawae

研究成果: Contribution to journalConference article査読


We construct a "needle-anvil" type point-contact spectrometer for spin polarization measurements, which is installed in a 4He-cryostat. Two types of piezo devices are used to control the contact size precisely between a sample ferromagnet and a superconductor. An attocube piezo-based positioner is mounted for coarse movement of the tip, while a stacked-type piezo device is used for fine control of the contact size. This enables to change the contact size between the tip and sample from sub micro-meters to atomic-size contacts continuously. By suppressing thermal flow into the sample space and mechanical vibration, we can keep the contact over hours, enabling the precision measurements. To examine the performance of the spectrometer, we study the spin polarization of polycrystalline SrRuO3 with the point-contact Andreev reflection measurements. The polarization is estimated to be ∼0.59 at the clean limit of the interface, which is consistent with previous study.

ジャーナルJournal of Physics: Conference Series
出版ステータス出版済み - 9 21 2017
イベント1st Asian ICMC and CSSJ 50th Anniversary Conference - Kanazawa, 日本
継続期間: 11 7 201611 10 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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