DOI: 10.1126/science.1095068. Vortex Core-Driven Magnetization Dynamics

Vortex Core-Driven Magnetization Dynamics

10.1126/science.1095068

Crossref journal-article

American Association for the Advancement of Science (AAAS)

Science (221)

Abstract

Time-resolved x-ray imaging shows that the magnetization dynamics of a micron-sized pattern containing a ferromagnetic vortex is determined by its handedness, or chirality. The out-of-plane magnetization in the nanometer-scale vortex core induces a three-dimensional handedness in the planar magnetic structure, leading to a precessional motion of the core parallel to a subnanosecond field pulse. The core velocity was an order of magnitude higher than expected from the static susceptibility. These results demonstrate that handedness, already well known to be important in biological systems, plays an important role in the dynamics of microscopic magnets.

Bibliography

Choe, S.-B., Acremann, Y., Scholl, A., Bauer, A., Doran, A., StoÌhr, J., & Padmore, H. A. (2004). Vortex Core-Driven Magnetization Dynamics. Science, 304(5669), 420â422.

Authors 7

S.-B. Choe (first)
Y. Acremann (additional)
A. Scholl (additional)
A. Bauer (additional)
A. Doran (additional)
J. Stöhr (additional)
H. A. Padmore (additional)

References 16 Referenced 566

10.1126/science.289.5481.930
10.1126/science.1075302
10.1103/PhysRevLett.53.190
10.1103/PhysRevB.50.12711
10.1063/1.1450816
10.1103/PhysRevB.67.020403
10.1126/science.290.5491.492
10.1038/nature00905
10.1126/science.259.5095.658
10.1126/science.287.5455.1014
Materials and methods are available as supporting material on Science Online.
A gyrotropic motion in the magnetostatic field of the displaced vortex is superimposed explaining the angle of the initial acceleration to the external field.
Simulations were performed on 20-nm-thick 1 × 1 μm 2 squares divided into 3.3-nm square cells. We used a saturation magnetization of 1.88 T an exchange stiffness of 3.0 × 10 –11 J/m no crystalline anisotropy and a damping constant of 0.02.
10.1103/PhysRevLett.88.157203
\batchmode \documentclass[fleqn 10pt legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(b=2\sqrt{2A{/}{\mu}_{0}M_{5}^{2}}\) \end{document} approximates core diameter with exchange stiffness A ( 2 ).
We thank the National Center for Electron Microscopy LBNL and the Microlab at the University of California–Berkeley for giving us access to their lithography facilities and H. C. Siegmann for many valuable discussions. Supported by the Office of Basic Energy Sciences of the U.S. Department of Energy (A.L.S. and S.S.R.L.) by the Laboratory Directed Research and Development Program of LBNL and by the National Science Foundation under grant no. DMR-0203835 (J.S.).

Dates

Type	When
Created	21 years, 4 months ago (April 15, 2004, 4:43 p.m.)
Deposited	1 year, 7 months ago (Jan. 9, 2024, 10:41 p.m.)
Indexed	1 week, 1 day ago (Aug. 23, 2025, 9:54 p.m.)
Issued	21 years, 4 months ago (April 16, 2004)
Published	21 years, 4 months ago (April 16, 2004)
Published Print	21 years, 4 months ago (April 16, 2004)

Funders 0

None

BibTeX

@article{Choe_2004, title={Vortex Core-Driven Magnetization Dynamics}, volume={304}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.1095068}, DOI={10.1126/science.1095068}, number={5669}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Choe, S.-B. and Acremann, Y. and Scholl, A. and Bauer, A. and Doran, A. and Stöhr, J. and Padmore, H. A.}, year={2004}, month=apr, pages={420–422} }

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