Abstract
We report the direct observation of a localized magnetic soliton in a spin-transfer nanocontact using scanning transmission x-ray microscopy. Experiments are conducted on a lithographically defined 150 nm diameter nanocontact to an ultrathin ferromagnetic multilayer with perpendicular magnetic anisotropy. Element-resolved x-ray magnetic circular dichroism images show an abrupt onset of a magnetic soliton excitation localized beneath the nanocontact at a threshold current. However, the amplitude of the excitation at the contact center is far less than that predicted (), showing that the spin dynamics is not described by existing models.
- Received 3 April 2015
DOI:https://doi.org/10.1103/PhysRevLett.115.127205
© 2015 American Physical Society