title: Upper bound for the magnetic force gradient in graphite.
abstract: In this work we investigate possible ferromagnetic order on the graphite surface by using magnetic force microscopy (MFM). Our data show that the tip-sample interaction along the steps is independent of an external magnetic field. Moreover, by combining kelvin probe force microscopy and MFM, we are able to separate the electrostatic and magnetic interactions along the steps obtaining an upper bound for the magnetic force gradient of 16 μN/m. Our experiments suggest the absence of ferromagnetic signal in graphite at room temperature.
authors.affiliation: Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
authors.forename: David
authors.initials: D
authors.lastname: Martínez-Martín
authors.forename: Miriam
authors.initials: M
authors.lastname: Jaafar
authors.forename: Rubén
authors.initials: R
authors.lastname: Pérez
authors.forename: Julio
authors.initials: J
authors.lastname: Gómez-Herrero
authors.forename: Agustina
authors.initials: A
authors.lastname: Asenjo