title: Nanoscale imaging and control of domain-wall hopping with a nitrogen-vacancy center microscope.
abstract: The control of domain walls in magnetic wires underpins an emerging class of spintronic devices. Propagation of these walls in imperfect media requires defects that pin them to be characterized on the nanoscale. Using a magnetic microscope based on a single nitrogen-vacancy (NV) center in diamond, we report domain-wall imaging on a 1-nanometer-thick ferromagnetic nanowire and directly observe Barkhausen jumps between two pinning sites spaced 50 nanometers apart. We further demonstrate in situ laser control of these jumps, which allows us to drag the domain wall along the wire and map the pinning landscape. Our work demonstrates the potential of NV microscopy to study magnetic nano-objects in complex media, whereas controlling domain walls with laser light may find an application in spintronic devices.
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud and ENS Cachan, UPR CNRS 3321, 91405 Orsay, France. Laboratoire de Photonique Quantique et Moléculaire, ENS Cachan and CNRS, UMR CNRS 8537, 94235 Cachan, France.
authors.forename: J-P
authors.initials: JP
authors.lastname: Tetienne
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud and ENS Cachan, UPR CNRS 3321, 91405 Orsay, France. Laboratoire de Photonique Quantique et Moléculaire, ENS Cachan and CNRS, UMR CNRS 8537, 94235 Cachan, France.
authors.forename: T
authors.initials: T
authors.lastname: Hingant
authors.affiliation: Institut d'Electronique Fondamentale, Université Paris-Sud and CNRS, UMR CNRS 8622, 91405 Orsay, France.
authors.forename: J-V
authors.initials: JV
authors.lastname: Kim
authors.affiliation: Institut d'Electronique Fondamentale, Université Paris-Sud and CNRS, UMR CNRS 8622, 91405 Orsay, France.
authors.forename: L Herrera
authors.initials: LH
authors.lastname: Diez
authors.affiliation: Institut d'Electronique Fondamentale, Université Paris-Sud and CNRS, UMR CNRS 8622, 91405 Orsay, France.
authors.forename: J-P
authors.initials: JP
authors.lastname: Adam
authors.affiliation: Institut d'Electronique Fondamentale, Université Paris-Sud and CNRS, UMR CNRS 8622, 91405 Orsay, France.
authors.forename: K
authors.initials: K
authors.lastname: Garcia
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud and ENS Cachan, UPR CNRS 3321, 91405 Orsay, France.
authors.forename: J-F
authors.initials: JF
authors.lastname: Roch
authors.affiliation: Laboratoire de Physique des Solides, Université Paris-Sud and CNRS, UMR CNRS 8502, 91405 Orsay, France.
authors.forename: S
authors.initials: S
authors.lastname: Rohart
authors.affiliation: Laboratoire de Physique des Solides, Université Paris-Sud and CNRS, UMR CNRS 8502, 91405 Orsay, France.
authors.forename: A
authors.initials: A
authors.lastname: Thiaville
authors.affiliation: Institut d'Electronique Fondamentale, Université Paris-Sud and CNRS, UMR CNRS 8622, 91405 Orsay, France.
authors.forename: D
authors.initials: D
authors.lastname: Ravelosona
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud and ENS Cachan, UPR CNRS 3321, 91405 Orsay, France. Laboratoire de Photonique Quantique et Moléculaire, ENS Cachan and CNRS, UMR CNRS 8537, 94235 Cachan, France. vjacques@ens-cachan.fr.
authors.forename: V
authors.initials: V
authors.lastname: Jacques