2018/03/27 by Jinting Hang, Christian Hahn, Nahuel Statuto +2 · 19 citations
Computer Science · Engineering · Physics and Astronomy · #Advanced Data Storage Technologies #Anisotropy #Annihilation #Characterization and Applications of Magnetic Nanoparticles #Condensed matter physics #Ferromagnetism #Laser #Magnetic field #Magnetic properties of thin films #Magnetization #Magnon #Materials science #Microsecond #Nanosecond #Optics #Permalloy #Physics #Quantum mechanics #cond-mat.mes-hall
paper · pdf · doi:10.1038/s41598-018-25134-z
published in Scientific Reports 8(1), 6847 (Nature Portfolio) · 12 pages, 4 figures
arxiv created 2018/03/27 · openalex publication_date 2018/04/25 · arxiv updated 2018/05/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Magnetic droplet solitons were first predicted to occur in materials with uniaxial magnetic anisotropy due to a long-range attractive interaction between elementary magnetic excitations, magnons. A non-equilibrium magnon population provided by a spin-polarized current in nanocontacts enables their creation and there is now clear experimental evidence for their formation, including direct images obtained with scanning x-ray transmission microscopy. Interest in magnetic droplets is associated with their unique magnetic dynamics that can lead to new types of high frequency nanometer scale oscillators of interest for information processing, including in neuromorphic computing. However, there are no direct measurements of the time required to nucleate droplet solitons or their lifetime-experiments to date only probe their steady-state characteristics, their response to dc spin-currents. Here we determine the timescales for droplet annihilation and generation using current pulses. Annihilation occurs in a few nanoseconds while generation can take several nanoseconds to a microsecond depending on the pulse amplitude. Micromagnetic simulations show that there is an incubation time for droplet generation that depends sensitively on the initial magnetic state of the nanocontact. An understanding of these processes is essential to utilizing the unique characteristics of magnetic droplet solitons oscillators, including their high frequency, tunable and hysteretic response.