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Investigation of magnetic droplet solitons using x-ray holography with extended references

DOI: 10.1038/s41598-018-29856-y DOI Help

Authors: E. Burgos-parra (University of Exeter) , N. Bukin (University of Exeter) , S. Sani (KTH Royal Institute of Technology) , A. I. Figueroa (Diamond Light Source) , G. Beutier (University Grenoble Alpes, CNRS) , M. Dupraz (University Grenoble Alpes, CNRS) , S. Chung (KTH Royal Institute of Technology; University of Gothenburg; Uppsala University) , P. Dürrenfeld (University of Gothenburg) , Q. Tuan Le (University of Gothenburg; Uppsala University) , S. M. Mohseni (Shahid Beheshti University) , A. Houshang (University of Gothenburg) , S. A. Cavill (University of York) , R. J. Hicken (University of Exeter) , J. Akerman (KTH Royal Institute of Technology; University of Gothenburg) , G. Van Der Laan (Diamond Light Source) , F. Y. Ogrin (University of Exeter)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scientific Reports , VOL 8 , PAGES 11533

State: Published (Approved)
Published: August 2018
Diamond Proposal Number(s): 15277

Open Access Open Access

Abstract: A dissipative magnetic soliton, or magnetic droplet, is a structure that has been predicted to exist within a thin magnetic layer when non-linearity is balanced by dispersion, and a driving force counteracts the inherent damping of the spin precession. Such a soliton can be formed beneath a nano-contact (NC) that delivers a large spin-polarized current density into a magnetic layer with perpendicular magnetic anisotropy. Although the existence of droplets has been confirmed from electrical measurements and by micro-magnetic simulations, only a few attempts have been made to directly observe the magnetic landscape that sustains these structures, and then only for a restricted set of experimental parameter values. In this work we use and x-ray holography technique HERALDO, to image the magnetic structure of the [Co/Ni]x4 multilayer within a NC orthogonal pseudo spin-valve, for different range of magnetic fields and injected electric currents. The magnetic configuration imaged at −33 mA and 0.3 T for devices with 90 nm NC diameter reveals a structure that is within the range of current where the droplet soliton exist based on our electrical measurements and have it is consistent with the expected size of the droplet (∼100 nm diameter) and its spatial position within the sample. We also report the magnetisation configurations observed at lower DC currents in the presence of fields (0–50 mT), where it is expected to observe regimes of the unstable droplet formation.

Journal Keywords: spintronics; holography; nanocontacts

Subject Areas: Physics, Materials, Technique Development


Instruments: I06-Nanoscience , I10-Beamline for Advanced Dichroism

Documents:
s41598-018-29856-y.pdf