Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Ultrafast manetization enhancement in metallic multilayers driven by superdiffusive spin current



Thomas J. Silva, Justin M. Shaw, Hans T. Nembach, Dennis Rudolf, Chan La-O-Vorakiat, Marco Battiato, Roman Adam, Emrah Turgut, Stefan Mathias, Margaret M. Murnane, Henry C. Kapteyn, Claus M. Schneider


Uncovering the physical mechanisms that govern ultrafast charge and spin dynamics is crucial for understanding correlated matter as well as the fundamental limits of ultrafast spin-based electronics. Spin dynamics in magnetic materials can be driven by ultrashort light pulses, resulting in a transient drop in magnetization within a few hundred femtoseconds. However, a full understanding of femtosecond spin dynamics remains elusive. Here, we spatially separate the spin dynamics using Ni/Ru/Fe magnetic trilayers, where the Ni and Fe layers can be ferro- or antiferromagnetically coupled. By exciting the layers with a laser pulse and probing the magnetization response simultaneously but separately in Ni and Fe, we surprisingly find that optically induced demagnetization of the Ni layer transiently enhances the magnetization of the Fe layer when the two layer magnetications are initially aligned parallel. Our observations are explained by a laser-generated superdiffusive spin current between the layers.
Nature Communications


spin current, ultrafast demagnetization, femtosecond laser, high harmonic generation


Silva, T. , Shaw, J. , Nembach, H. , Rudolf, D. , La-O-Vorakiat, C. , Battiato, M. , Adam, R. , Turgut, E. , Mathias, S. , Murnane, M. , Kapteyn, H. and Schneider, C. (2012), Ultrafast manetization enhancement in metallic multilayers driven by superdiffusive spin current, Nature Communications, [online], (Accessed May 19, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created September 4, 2012, Updated February 19, 2017