AVS 60th International Symposium and Exhibition
    Tribology Focus Topic Monday Sessions
       Session TR+AS+NS+SS-MoA

Paper TR+AS+NS+SS-MoA4
Electronic Friction at the Atomic Scale: Conduction, Electrostatic and Magnetic Effects

Monday, October 28, 2013, 3:00 pm, Room 203 C

Session: Molecular Origins of Friction
Presenter: Z. Fredricks, North Carolina State University
Authors: Z. Fredricks, North Carolina State University
K.M. Stevens, North Carolina State University
J. Krim, North Carolina State University
Correspondent: Click to Email
In the study of friction at the nanoscale, phononic, electrostatic, conduction electron and magnetic effects all contribute to the dissipation mechanisms [1,2]. Magnetic contributions are increasingly alluded to in current studies, but remain poorly characterized. We report here our observations magnetic friction for sliding adsorbed films on various magnetic films substrates in the presence and absence of an external field. Using a quartz crystal microbalance (QCM), we record the sliding friction of liquid monolayers of nitrogen, a diamagnetic material, as well as liquid oxygen, a paramagnetic material, on nickel alloy and graphene/nickel surfaces. In the prior literature, these systems have been reported to exhibit sensitivity to external fields. The work presented here compares and contrasts fundamental dissipation mechanisms in sliding adsorbed films [3] to studies performed by means of magnetic tip microscopy [1]. [1] I. Altfeder and J. Krim, J. Appl. Phys. (2012), [2] Highland et al., PRL (2006) [3] J. Krim, Advances in Physics, Vol. 61, Iss. 3, 155-323 (2012); Work supported by NSF DMR