Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.127205
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Funding
- European Commission [MC-IOF 253214]
- Catalan Government COFUND-FP7
- Spanish Government [MAT2011-23698]
- Knut and Alice Wallenberg Foundation
- U.S. Army Research Office ARO-MURI [W911NF-08-1-0317]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886, DE-AC02-76SF00515]
- [NSF-DMR-1309202]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1309202] Funding Source: National Science Foundation
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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 similar or equal to 25 degrees at the contact center is far less than that predicted (<= 180 degrees), showing that the spin dynamics is not described by existing models.
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