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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...

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Photo-spin-voltaic effect in PtMn/Y₃Fe₅O₁₂ thin films.

Roshni Yadav¹, Michael Shepit², Xu Li³

¹Department of Materials Science and Engineering, National Chung Hsing University, Taichung, Taiwan.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|October 30, 2020

Summary

We observed the photo-spin-voltaic effect in PtMn/YIG heterostructures, where light generates a spin voltage. This effect

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Area of Science:

Spintronics
Materials Science
Optoelectronics

Background:

The photo-spin-voltaic effect involves generating spin voltage in non-magnetic metals near ferrimagnetic insulators via photon absorption.
This phenomenon is linked to excited electron-hole diffusion across the interface.

Purpose of the Study:

To investigate the photo-induced-spin voltaic effect in a PtMn/YIG/GGG heterostructure.
To understand the influence of magnetic field polarity and PtMn layer thickness on the generated voltage.

Main Methods:

Fabrication of PtMn/YIG/GGG heterostructures using dual-ion-beam sputtering.
Measurement of photo-generated voltage under varying magnetic field polarities and PtMn thicknesses.

Main Results:

Observed a photo-induced-spin voltaic effect in the PtMn/YIG/GGG heterostructure.
The sign of the photo-generated voltage switched with magnetic field polarity.
Voltage intensity decreased with increasing PtMn thickness, indicating spin-polarized electron confinement.

Conclusions:

The study confirms the photo-spin-voltaic effect in PtMn/YIG heterostructures.
Spin-polarized electrons near the interface, photo-excitation, and spin-orbit coupling with Pt drive the transverse voltage.
This research may lead to applications in antiferromagnetic spintronics.