Fast current-driven domain walls and small skyrmions in a compensated ferrimagnet
2018
Spintronicsis a research field that aims to understand and control spins on the nanoscale and should enable next-generation data storage and manipulation. One technological and scientific key challenge is to stabilize small spin textures and to move them efficiently with high velocities. For a long time, research focused on ferromagnetic materials, but ferromagnets show fundamental limits for speed and size. Here, we circumvent these limits using compensated
ferrimagnets. Using
ferrimagneticPt/Gd44Co56/TaOx films with a sizeable Dzyaloshinskii–Moriya interaction, we realize a current-driven domain wall motion with a speed of 1.3 km s–1 near the angular momentum compensation temperature (TA) and room-temperature-stable
skyrmionswith minimum diameters close to 10 nm near the
magneticcompensation
temperature(TM). Both the size and dynamics of the
ferrimagnetare in excellent agreement with a simplified effective ferromagnet theory. Our work shows that high-speed, high-density
spintronicsdevices based on current-driven spin textures can be realized using materials in which TA and TM are close together.
Keywords:
-
Correction
-
Source
-
Cite
-
Save
61
References
307
Citations
NaN
KQI