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Measuring Interactions of Globular and Filamentous Proteins by Nuclear Magnetic Resonance Spectroscopy NMR and Microscale Thermophoresis MST
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Probing Magnetic Exchange Interactions with Helium.

C Trainer1, C M Yim1,2, C Heil3

  • 1SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, United Kingdom.

Physical Review Letters
|November 1, 2021
PubMed
Summary
This summary is machine-generated.

We demonstrate voltage control of electron spin polarization in spintronic devices. Helium

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Area of Science:

  • Spintronics
  • Quantum Mechanics
  • Materials Science

Background:

  • Electron spin polarization is fundamental to spintronics.
  • Spin-polarized scanning tunneling microscopy (SP-STM) is a key technique for probing magnetic materials.

Purpose of the Study:

  • To investigate the impact of helium on spin polarization and magnetic contrast in SP-STM.
  • To explore voltage control of spin polarization in tunneling junctions.

Main Methods:

  • Spin-polarized scanning tunneling microscopy (SP-STM)
  • Tunneling spectroscopy
  • Analysis of tunneling spectra and magnetic contrast

Main Results:

  • Helium presence significantly affects magnetic contrast in SP-STM images.
  • Tunneling electrons can reversibly eject helium from the junction.
  • Helium ejection energy is spin-dependent, revealing magnetic exchange interactions.
  • Time-averaged spin polarization is suppressed by helium, but can be controlled by voltage.

Conclusions:

  • Helium's interaction with the tunneling junction offers a novel method for voltage-controlled spintronics.
  • This work establishes a new pathway for manipulating and sensing spin polarization.