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Updated: Sep 2, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Tunable spin injection and detection across a van der Waals interface.

Keun-Hong Min^1,2, Duk Hyun Lee¹, Sang-Jun Choi³

¹Interdisciplinary Materials Measurement Institute, Korea Research Institute of Standards and Science, Daejeon, Republic of Korea.

Nature Materials

|August 4, 2022

Summary

Researchers created tunable spin injection and detection in 2D magnetic van der Waals heterostructures. Electrical bias controls spin polarization, enabling novel spintronic device functionalities.

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Area of Science:

Condensed Matter Physics
Materials Science
Spintronics

Background:

Van der Waals (vdW) heterostructures with 2D magnets offer atomically sharp interfaces.
These interfaces minimize spin-flipping scattering, preserving spin-polarized electronic states.
This is crucial for advancing spintronic device functionalities.

Purpose of the Study:

To demonstrate electrically tunable spin injection and detection in vdW heterostructures.
To investigate the modulation and reversal of spin polarization via electrical bias.
To explore the potential for electronic control in next-generation spintronic devices.

Main Methods:

Fabrication of vdW heterostructures using ferromagnetic Fe3GeTe2 with hexagonal boron nitride and WSe2.
Electrical measurements to assess spin injection and detection efficiency.
Application of electrical bias to tune spin polarization and observe magnetoresistance changes.

Main Results:

Achieved highly transparent spin injection and detection across vdW interfaces.
Demonstrated electrical tunability of net spin polarization, including polarity reversal.
Observed sign changes in tunneling magnetoresistance correlated with spin polarization reversals.

Conclusions:

Sizable contributions from high-energy localized spin states in the ferromagnet enable spin polarization reversals.
The demonstrated tunability of spin-valve operations is a promising route for electronic control.
This work paves the way for next-generation low-dimensional spintronic devices.