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Direct Spin-Imaging Detector Based on Freestanding Magnetic Nanomembranes
O E Tereshchenko1,2,3, V V Bakin1, S A Stepanov3
1Russian Academy of Sciences, Rzhanov Institute of Semiconductor Physics, Siberian Branch, Novosibirsk 630090, Russia.
Physical Review Letters
|May 2, 2025
Summary
Researchers developed a novel spin filter using a ferromagnetic nanomembrane and microchannel plate (MCP) for efficient electron spin filtering and amplification. This device enables compact, optical measurement of electron spin polarization in imaging modes.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- Electron spin manipulation is crucial for advanced electronic devices.
- Existing methods for spin analysis often lack efficiency or compactness.
- Microchannel plates (MCPs) are widely used for electron detection and amplification.
Purpose of the Study:
- To develop an electron spin filter analogous to optical polarizers.
- To integrate a ferromagnetic nanomembrane with an MCP for spin-dependent electron filtering and amplification.
- To demonstrate a compact device for imaging electron spin polarization.
Main Methods:
- Fabrication of freestanding ferromagnetic (FM) nanomembranes using [Co/Pt] superlattices on SiO2 layers.
- Integration of the FM nanomembrane with a microchannel plate (MCP) to create an FM-MCP.
- Construction of a spin-triode device (spintron) incorporating the FM-MCP, a spin-polarized electron source, and a phosphor screen.
Main Results:
- Demonstrated efficient spin filtering and electron amplification using the FM-MCP.
- Achieved a single-channel Sherman function (S) of 0.6 and transmission of ~1.5x10^-3 in the low electron energy range.
- The FM-MCP-based device operates in an imaging mode, providing a 2D field of view.
Conclusions:
- The developed FM-MCP serves as an effective electron spin filter and amplifier.
- The spintron device offers a compact optical method for measuring electron spin polarization.
- This technology is well-suited for applications in photoemission spectroscopy and microscopy.
