title: Ultra compact multitip scanning tunneling microscope with a diameter of 50 mm.
abstract: We present a multitip scanning tunneling microscope (STM) where four independent STM units are integrated on a diameter of 50 mm. The coarse positioning of the tips is done under the control of an optical microscope or scanning electron microscopy in vacuum. The heart of this STM is a new type of piezoelectric coarse approach called KoalaDrive. The compactness of the KoalaDrive allows building a four-tip STM as small as a single-tip STM with a drift of less than 0.2  nm/min at room temperature and lowest resonance frequencies of 2.5  kHz (xy) and 5.5  kHz (z). We present as examples of the performance of the multitip STM four point measurements of silicide nanowires and graphene.
authors.affiliation: Peter Grünberg Institut, Forschungszentrum Jülich, 52425 Jülich, Germany.
authors.forename: Vasily
authors.initials: V
authors.lastname: Cherepanov
authors.forename: Evgeny
authors.initials: E
authors.lastname: Zubkov
authors.forename: Hubertus
authors.initials: H
authors.lastname: Junker
authors.forename: Stefan
authors.initials: S
authors.lastname: Korte
authors.forename: Marcus
authors.initials: M
authors.lastname: Blab
authors.forename: Peter
authors.initials: P
authors.lastname: Coenen
authors.forename: Bert
authors.initials: B
authors.lastname: Voigtländer