lefty1117
Member
Look I'll break it down for you as simply as I can:
A promising approach is to encode bits of information using nanoscale spin textures, such as chiral domain walls or skyrmions that can be translated by currents across racetrack-like wire devices. One technological and scientific challenge is to stabilize small spin textures and to move them efficiently with high velocities, which is critical for dense, fast memory. For the past decade, work has focused on using ferromagnetic heterostructures to host chiral spin textures. However, ferromagnets have fundamental limitations that inhibit further progress: large stray fields limit bit sizes and precessional dynamics limit operating speeds.
By using ferrimagnets, the fundamental limits of ferromagnets can be overcome, realizing order-of-magnitude improvements in both size and speed. Using metallic, ferrimagnetic Pt/Gd₄₄Co₅₆/TaOx films with a sizeable Dzyaloshinskii-Moriya interaction (DMI), we realize a current-driven domain wall motion of 1.3 km s⁻¹ near the angular momentum compensation temperature and room-temperature-stable skyrmions with diameters close to 10 nm near the magnetic compensation temperature.
And so by utilizing the ultra-low damping nature of Bi-YIG and an in-plane field, we can drive domain walls in GSGG/Bi-YIG/Pt at near relativistic velocities exceeding 4.0 km s-1, where the domain wall velocity is no longer limited by a velocity plateau defined by the in-plane field, but the magnon group velocity in Bi-YIG. These results show that multi-sublattice ferrimagnetic films are a promising materials system for next-generation data storage, paving a path forward for the field of spintronics.
Hope that clears it up. /thread
A promising approach is to encode bits of information using nanoscale spin textures, such as chiral domain walls or skyrmions that can be translated by currents across racetrack-like wire devices. One technological and scientific challenge is to stabilize small spin textures and to move them efficiently with high velocities, which is critical for dense, fast memory. For the past decade, work has focused on using ferromagnetic heterostructures to host chiral spin textures. However, ferromagnets have fundamental limitations that inhibit further progress: large stray fields limit bit sizes and precessional dynamics limit operating speeds.
By using ferrimagnets, the fundamental limits of ferromagnets can be overcome, realizing order-of-magnitude improvements in both size and speed. Using metallic, ferrimagnetic Pt/Gd₄₄Co₅₆/TaOx films with a sizeable Dzyaloshinskii-Moriya interaction (DMI), we realize a current-driven domain wall motion of 1.3 km s⁻¹ near the angular momentum compensation temperature and room-temperature-stable skyrmions with diameters close to 10 nm near the magnetic compensation temperature.
And so by utilizing the ultra-low damping nature of Bi-YIG and an in-plane field, we can drive domain walls in GSGG/Bi-YIG/Pt at near relativistic velocities exceeding 4.0 km s-1, where the domain wall velocity is no longer limited by a velocity plateau defined by the in-plane field, but the magnon group velocity in Bi-YIG. These results show that multi-sublattice ferrimagnetic films are a promising materials system for next-generation data storage, paving a path forward for the field of spintronics.
Hope that clears it up. /thread
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