Intense laser light can create attosecond magnetism in solids with heavy atoms, offering new insights into magnetization and potentially enabling ultrafast memory devices. Intense laser light can induce magnetism in solids on the attosecond scale – the fastest magnetic response to date. That is t
An intense laser pulse is shone onto the material, inducing ultrafast spin flipping processes that occur on a timescale of ~100 attoseconds. Credit: © J. Harms, MPSD
Intense laser light can induce magnetism in solids on the attosecond scale – the fastest magnetic response to date. That is the finding reached by theoreticians at the MPSD, who used advanced simulations to investigate the magnetization process in several 2D and 3D materials. Their calculations show that, in structures with heavy atoms, the fast electron dynamics initiated by the laser pulses can be converted to attosecond magnetism.
The theoreticians set out to investigate what magnetic phenomena can occur when solids interact with intense linearly-polarized laser pulses, that typically accelerate electrons on very fast timescales inside matter. “These conditions are fascinating to explore, because when the laser pulses have a linear polarization, they are typically believed not to induce any magnetism,” says Neufeld.
Using advanced simulation tools to explain the underlying mechanism, the team showed that the intense light flips the electrons’ spins back and forth. The laser effectively accelerates the electrons in circular-like orbits in the space of a few hundred attoseconds. These strong spin-orbit interactions then align the spin directions.
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