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Science 9 February 2001:
Vol. 291. no. 5506, pp. 1015 - 1018
DOI: 10.1126/science.1057430
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Reports

Magnetization Precession by Hot Spin Injection

W. Weber,1* S. Riesen,1 H. C. Siegmann2

As electrons are injected at various energies into ferromagnetic material with their spin polarization vector perpendicular to the axis of the magnetization, we observe precessional motion of the spin polarization on the femtosecond time scale. Because of angular momentum conservation, the magnetization vector must precess as well. We show that spin injection will generate the precessional magnetization reversal in nanosized ferromagnetic bits. At reasonable injected current densities this occurs on the picosecond time scale.

1 Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland.
2 Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309, USA.
*   To whom correspondence should be addressed. E-mail: weber{at}solid.phys.ethz.ch

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