Development of point-contact spectrometer for spin polarization measurements

M. Shiga, N. Nishimura, H. Takata, Yuji Inagaki, H. Kambara, K. Tenya, Tatsuya Kawae

Research output: Contribution to journalConference article

Abstract

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.

Original languageEnglish
Article number012001
JournalJournal of Physics: Conference Series
Volume897
Issue number1
DOIs
Publication statusPublished - Sep 21 2017
Event1st Asian ICMC and CSSJ 50th Anniversary Conference - Kanazawa, Japan
Duration: Nov 7 2016Nov 10 2016

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spectrometers
polarization
cryostats
anvils
needles
vibration

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Development of point-contact spectrometer for spin polarization measurements. / Shiga, M.; Nishimura, N.; Takata, H.; Inagaki, Yuji; Kambara, H.; Tenya, K.; Kawae, Tatsuya.

In: Journal of Physics: Conference Series, Vol. 897, No. 1, 012001, 21.09.2017.

Research output: Contribution to journalConference article

Shiga, M. ; Nishimura, N. ; Takata, H. ; Inagaki, Yuji ; Kambara, H. ; Tenya, K. ; Kawae, Tatsuya. / Development of point-contact spectrometer for spin polarization measurements. In: Journal of Physics: Conference Series. 2017 ; Vol. 897, No. 1.
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