| 4D Lorentz electron microscopy imaging: magnetic domain wall nucleation, reversal, and wave velocity. | |
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MedLine Citation:
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PMID: 20735136 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Magnetization reversal is an important topic of research in the fields of both basic and applied ferromagnetism. For the study of magnetization reversal dynamics and magnetic domain wall (DW) motion in ferromagnetic thin films, imaging techniques are indispensable. Here, we report 4D imaging of DWs by the out-of-focus Fresnel method in Lorentz ultrafast electron microscopy (UEM), with in situ spatial and temporal resolutions. The temporal change in magnetization, as revealed by changes in image contrast, is clocked using an impulsive optical field to produce structural deformation of the specimen, thus modulating magnetic field components in the specimen plane. Directly visualized are DW nucleation and subsequent annihilation and oscillatory reappearance (periods of 32 and 45 ns) in nickel films on two different substrates. For the case of Ni films on a Ti/Si(3)N(4) substrate, under conditions of minimum residual external magnetic field, the oscillation is associated with a unique traveling wave train of periodic magnetization reversal. The velocity of DW propagation in this wave train is measured to be 172 m/s with a wavelength of 7.8 microm. The success of this study demonstrates the promise of Lorentz UEM for real-space imaging of spin switching, ferromagnetic resonance, and laser-induced demagnetization in ferromagnetic nanostructures. |
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Authors:
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Hyun Soon Park; J Spencer Baskin; Ahmed H Zewail |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Nano letters Volume: 10 ISSN: 1530-6992 ISO Abbreviation: Nano Lett. Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-09-08 Completed Date: 2011-01-04 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101088070 Medline TA: Nano Lett Country: United States |
Other Details:
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Languages: eng Pagination: 3796-803 Citation Subset: IM |
Affiliation:
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Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, USA. |
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| MeSH Terms | |
Descriptor/Qualifier:
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Magnetics* Microscopy, Electron / methods* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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