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Spin Hall Magnetoresistance Effect from a Disordered Interface.

Sara Catalano1, Juan M Gomez-Perez1, M Xochitl Aguilar-Pujol1

  • 1CIC nanoGUNE, Donostia-San Sebastián, Basque Country 20018, Spain.

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|February 4, 2022
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Summary
This summary is machine-generated.

Spin Hall magnetoresistance (SMR) measurements can be misleading due to interfacial disorder. This study reveals that SMR-like signals in Pt/MnPSe3 heterostructures originate from amorphous layers, not the intended magnetic material interactions.

Keywords:
2D materialsheavy metalsinterfacesmagneto-transportspin Hall magnetoresistancespintronicsspin−orbit couplingtransmission-electron microscopy

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Spin Hall magnetoresistance (SMR) is a key technique for probing magnetic properties using electrical measurements.
  • Van der Waals magnetic materials offer potential for atomically thin magnetic devices.
  • Interfacial defects and disorder can introduce artifacts in SMR measurements.

Purpose of the Study:

  • To investigate the origin of SMR-like signals in platinum (Pt)/van der Waals antiferromagnet MnPSe3 heterostructures.
  • To determine the impact of interfacial disorder on SMR measurements.
  • To re-evaluate the role of disorder in SMR studies of magnetic heterostructures.

Main Methods:

  • Fabrication of Pt/MnPSe3 heterostructures.
  • Measurement of spin Hall magnetoresistance response.
  • Characterization of the Pt/MnPSe3 interface using transmission electron microscopy (TEM).

Main Results:

  • A robust SMR-like signal was observed in the heterostructures.
  • TEM revealed a disordered, amorphous platinum-chalcogen layer at the interface.
  • The observed signal was attributed to this disordered interfacial layer, masking the intrinsic magnetic interactions.

Conclusions:

  • Strong interfacial disorder can generate significant SMR-like signals.
  • This phenomenon can obscure the intended SMR response from the van der Waals magnetic material.
  • The findings challenge assumptions about the role of disorder in SMR measurements and highlight the need for careful interface characterization.