Portal de Periódicos da CAPES

Nanoscale imaging and control of domain-wall hopping with a nitrogen-vacancy center microscope

2014; American Association for the Advancement of Science; Volume: 344; Issue: 6190 Linguagem: Inglês

10.1126/science.1250113

1095-9203

Jean‐Philippe Tetienne, T. Hingant, Joo-Von Kim, L. Herrera Diez, Jean‐Paul Adam, K. Garcia, Jean-François Roch, Stanislas Rohart, A. Thiaville, D. Ravelosona, V. Jacques,

Metal and Thin Film Mechanics

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.