Electronic Noise Spectroscopy of Quasi-Two-Dimensional Antiferromagnetic Semiconductors

Subhajit Ghosh; Zahra Ebrahim Nataj; Fariborz Kargar; Alexander A Balandin

doi:10.1021/acsami.4c01189

Electronic Noise Spectroscopy of Quasi-Two-Dimensional Antiferromagnetic Semiconductors

ACS Appl Mater Interfaces. 2024 Apr 10. doi: 10.1021/acsami.4c01189. Online ahead of print.

Authors

Subhajit Ghosh^{1

2}, Zahra Ebrahim Nataj^{1

2}, Fariborz Kargar³, Alexander A Balandin^{1

2}

Affiliations

¹ Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States.
² California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States.
³ Materials Research and Education Center, Department of Mechanical Engineering, Auburn University, Auburn, Alabama 36849, United States.

PMID: 38600813
DOI: 10.1021/acsami.4c01189

Abstract

We investigated low-frequency current fluctuations, i.e., electronic noise, in FePS₃ van der Waals layered antiferromagnetic semiconductor. The noise measurements have been used as noise spectroscopy for advanced materials characterization of the charge carrier dynamics affected by spin ordering and trapping states. Owing to the high resistivity of the material, we conducted measurements on vertical device configuration. The measured noise spectra reveal pronounced Lorentzian peaks of two different origins. One peak is observed only near the Néel temperature, and it is attributed to the corresponding magnetic phase transition. The second Lorentzian peak, visible in the entire measured temperature range, has characteristics of the trap-assisted generation-recombination processes similar to those in conventional semiconductors but shows a clear effect of the spin order reconfiguration near the Néel temperature. The obtained results contribute to understanding the electron and spin dynamics in this type of antiferromagnetic semiconductors and demonstrate the potential of electronic noise spectroscopy for advanced materials characterization.

Keywords: antiferromagnetic semiconductors; low-frequency noise; magnetic phase transitions; materials interfaces; quasi-two-dimensional materials; van der Waals materials.