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Tuning Nanoscale Friction by Applying Weak Magnetic Fields to Reorient Adsorbed Oxygen Molecules. CONDENSED MATTER 2018. [DOI: 10.3390/condmat4010001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Sliding friction levels of thin (1–2 monolayers) and thick (~10 monolayers) oxygen films adsorbed on nickel and gold at 47.5 K have been measured by means of a quartz crystal microbalance (QCM) technique. Friction levels for the thin (thick) films on nickel in the presence of a weak magnetic field were observed to be approximately 30% (50%) lower than those recorded in the absence of the external field. Friction levels for thin films on gold were meanwhile observed to be substantially increased in the presence of the field. Magnetically-induced structural reorientation (magnetostriction) and/or realignment of adlayer spins, which respectively reduce structural and magnetic interfacial corrugation and commensurability, appear likely mechanisms underlying the observed field-induced reductions in friction for the nickel samples. Eddy current formation in the gold substrates may account for the increased friction levels in this system. The work demonstrates the role of magnetic effects in model systems that are highly amenable to theoretical studies and modeling.
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Murakami Y, Suematsu H. Magnetic and melting transitions of oxygen monolayers and multilayers physisorped on exfoliated graphite. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:4146-4154. [PMID: 9986317 DOI: 10.1103/physrevb.54.4146] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Gay JM, Suzanne J, Coulomb JP. Wetting, surface melting, and freezing of thin films of methane adsorbed on MgO(100). PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:11346-11351. [PMID: 9993554 DOI: 10.1103/physrevb.41.11346] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Bhethanabotla VR, Steele WA. Computer-simulation study of melting in dense oxygen layers on graphite. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:9480-9487. [PMID: 9993293 DOI: 10.1103/physrevb.41.9480] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Youn HS, Hess GB. Wetting and melting behavior of oxygen films on graphite. PHYSICAL REVIEW LETTERS 1990; 64:443-446. [PMID: 10041981 DOI: 10.1103/physrevlett.64.443] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Kahng J, Ebner C. Melting of multilayer films: Further studies of a Potts lattice-gas model. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:11269-11277. [PMID: 9991692 DOI: 10.1103/physrevb.40.11269] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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