| Noncontact friction and relaxational dynamics of surface defects. | |
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MedLine Citation:
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PMID: 22540716 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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The motion of a cantilever near sample surfaces exhibits additional friction even before two bodies come into mechanical contact. Called noncontact friction (NCF), this friction is of great practical importance to the ultrasensitive force detection measurements. The observed large NCF of a micron-scale cantilever found an anomalously large damping that exceeds theoretical predictions by 8-11 orders of magnitude. This finding points to a contribution beyond fluctuating electromagnetic fields within the van der Waals approach. Recent experiments reported by Saitoh et al. [Phys. Rev. Lett. 105, 236103 (2010)] also found a nontrivial distance dependence of NCF. Motivated by these observations, we propose a mechanism based on the coupling of a cantilever to the relaxation dynamics of surface defects. We assume that the surface defects couple to the cantilever tip via spin-spin coupling and their spin relaxation dynamics gives rise to the backaction terms and modifies both the friction coefficient and the spring constant. We explain the magnitude, as well as the distance dependence of the friction due to these backaction terms. Reasonable agreement is found with the experiments. |
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Authors:
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Jian-Huang She; Alexander V Balatsky |
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Publication Detail:
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Type: Journal Article Date: 2012-03-28 |
Journal Detail:
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Title: Physical review letters Volume: 108 ISSN: 1079-7114 ISO Abbreviation: Phys. Rev. Lett. Publication Date: 2012 Mar |
Date Detail:
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Created Date: 2012-04-30 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401141 Medline TA: Phys Rev Lett Country: United States |
Other Details:
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Languages: eng Pagination: 136101 Citation Subset: IM |
Affiliation:
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Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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