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Related Experiment Video

Updated: Jan 31, 2026

Blood Flow Imaging with Ultrafast Doppler

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Published on: October 14, 2020

The ultrafast Einstein-de Haas effect.

C Dornes¹, Y Acremann², M Savoini³

¹Institute for Quantum Electronics, Physics Department, ETH Zurich, Zurich, Switzerland. dornesc@phys.ethz.ch.

|January 4, 2019

Summary

This summary is machine-generated.

In ultrafast demagnetization, laser-induced spin angular momentum loss in iron is transferred to the lattice within 200 femtoseconds, launching a strain wave. This reveals the crucial role of lattice interactions in femtosecond demagnetization dynamics.

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Area of Science:

Condensed matter physics
Ultrafast magnetism
Spin dynamics

Background:

The Einstein-de Haas effect demonstrates spin-to-mechanical angular momentum conversion.
Ultrafast demagnetization involves magnetization loss in <100 fs upon photoexcitation.
The fate of angular momentum during ultrafast demagnetization is not fully understood.

Purpose of the Study:

To investigate the timescale and mechanism of angular momentum transfer during laser-induced demagnetization.
To determine where the spin angular momentum is transferred on femtosecond timescales.

Main Methods:

Femtosecond time-resolved X-ray diffraction was used to probe iron.
Analysis involved fitting experimental X-ray data to simulations and optical data.

Main Results:

Most spin angular momentum lost during demagnetization transfers to the lattice within sub-picosecond timescales.
A transverse strain wave is launched into the bulk material.
Angular momentum transfer occurs on a ~200 femtosecond timescale, accounting for 80% of the lost spin angular momentum.

Conclusions:

Lattice interactions play an essential role in ultrafast demagnetization.
The findings elucidate the microscopic mechanism of angular momentum transfer in femtosecond demagnetization.