Vortex core-driven magnetization dynamics

Journal Article · Fri Apr 16 04:00:00 EDT 2004 · Science

DOI:https://doi.org/10.1126/science.1095068· OSTI ID:837924

Choe, Sug-Bong ^[1]; Acremann, Yves; Scholl, Andreas; Bauer, Andreas; Doran, Andrew; Stohr, Joachim; Padmore, Howard A

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1. LBNL Library

Time-resolved x-ray imaging shows that the magnetization dynamics of a micron-size 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 3-dimensional handedness in the planar magnetic structure, leading to a precessional motion of the core parallel to a sub-nanosecond field pulse. The core velocity is found to be 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.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. Office of Basic Energy Sciences; National Science Foundation Grant DMR-0203835 (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 837924
• Report Number(s): LBNL--54729
• Journal Information: Science, Journal Name: Science Vol. 304; ISSN 0193-4511; ISSN SCEHDK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHIRALITY
MAGNETIC VORTEX DYNAMICS
MAGNETIZATION
MAGNETS
VELOCITY