Large Magnetic Moment in Flexoelectronic Silicon at Room Temperature

Paul C. Lou, Anand Katailiha, Ravindra G. Bhardwaj, Ward P. Beyermann, Dominik M. Juraschek, Sandeep Kumar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Time-dependent rotational electric polarizations have been proposed to generate temporally varying magnetic moments, for example, through a combination of ferroelectric polarization and optical phonons. This phenomenon has been called dynamical multiferroicity, but explicit experimental demonstrations have been elusive to date. Here, we report the detection of a temporal magnetic moment as high as 1.2 μB/atom in a charge-doped thin film of silicon under flexural strain. We demonstrate that the magnetic moment is generated by a combination of electric polarization arising from a flexoelectronic charge separation along the strain gradient and the deformation potential of phonons. The effect can be controlled by adjusting the external strain gradient, doping concentration, and dopant and can be regarded as a dynamical multiferroic effect involving flexoelectronic polarization instead of ferroelectricity. The discovery of a large magnetic moment in silicon may enable the use of nonmagnetic and nonferroelectric semiconductors in various multiferroic and spintronic applications.

Original languageEnglish
Pages (from-to)2939-2945
Number of pages7
JournalNano Letters
Volume21
Issue number7
DOIs
StatePublished - 14 Apr 2021
Externally publishedYes

Funding

FundersFunder number
University of California, Riverside
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung184259

    Keywords

    • dynamical multiferroicity
    • flexoelectronic
    • phonon magnetic moment
    • silicon

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