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A sacrificial magnet concept for field dependent surface science studies.

Danyang Liu1, Jens Oppliger1, Aleš Cahlík1

  • 1Department of Physics, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.

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|December 29, 2022
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Summary

Researchers developed an accessible method to add magnetic fields to low-temperature scanning tunneling microscopy (STM). This technique is compatible with high-temperature sample cleaning, enabling new surface science studies.

Keywords:
Magnetic fieldMagnetic field angleSTM, Scanning Tunneling MicroscopeSacrificial Magnet ConceptSuperconducting vortexSurface Science

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Area of Science:

  • Surface Science
  • Condensed Matter Physics
  • Materials Science

Background:

  • Low-temperature scanning tunneling microscopy (STM) is crucial for atomic-scale surface studies.
  • Integrating magnetic fields into STM typically requires complex or high-cost setups.
  • High-temperature sample cleaning procedures can demagnetize or damage integrated magnetic field sources.

Purpose of the Study:

  • To present a simple and accessible method for incorporating a magnetic field into a low-temperature STM.
  • To ensure compatibility of the magnetic field integration with high-temperature sample preparation techniques.
  • To provide a reliable method for generating controllable magnetic fields for surface science experiments.

Main Methods:

  • Adhering a Neodymium-Iron-Boron (NdFeB) permanent magnet to a magnetizable sample plate.
  • Utilizing the magnet's irreversible demagnetization above its Curie temperature as part of the sample preparation cycle.
  • Employing an in-situ transfer tool to attach a new magnet after heating and before sample transfer into the STM.
  • Characterizing the generated magnetic field using the Abrikosov vortex lattice in superconducting Niobium Selenide (NbSe2).

Main Results:

  • Demonstrated a straightforward approach to integrate magnetic fields into low-temperature STM.
  • The method is compatible with high-temperature sample cleaning, involving in-situ magnet replacement after heating.
  • Magnetic fields up to 400 mT were generated and characterized.
  • Experimental magnetic field data showed excellent agreement with simulations, enabling accurate prediction of magnetic flux.

Conclusions:

  • The developed method offers an accessible solution for generating magnetic fields in STM.
  • The technique allows for selectable field strength and orientation, crucial for tailored experiments.
  • This approach overcomes the limitations of high-temperature sample preparation for field-dependent surface science studies.