AI Article Synopsis
- Ultrafast control of magnetic orientation is crucial for the development of spintronics, which is a future technology for electronics that relies on spin rather than charge.
- This research introduces a method to achieve magnetization changes in less than 100 femtoseconds by creating a "spin vacuum" through a minority spin current in a ferromagnet, which leads to quick charge redistribution.
- The findings align with recent experiments on subpicosecond switching in Co/Pt multilayers and offer guidelines for designing materials to enhance control over magnetic properties by adjusting electronic density states.
Article Abstract
Ultrafast control over the magnetic orientation of matter represents a vital element of potential future spin-based electronics ("spintronics"). While physical mechanisms underpinning spin switching are established for picosecond time scales, we here present a physical route to magnetization toggle control, i.e., multiple switching events, at <100 femtoseconds. A minority spin current injected into a ferromagnet is shown to generate rapid depopulation of the minority channel below the ground-state Fermi level, creating a minority "spin vacuum" that then drives rapid charge redistribution from the majority channel and spin switching. We demonstrate that this mechanism reproduces many of the features of recent subpicosecond switching of ferromagnetic Co/Pt multilayers and provide simple practical rules for the design of materials via tailoring the electronic density of states to optimize spin vacuum control over magnetic order.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11235157 | PMC |
| http://dx.doi.org/10.1126/sciadv.ado6390 | DOI Listing |
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