Phys.org September 26, 2023 Commonly observed in thin systems as two-dimensional sheets, in three dimensions skyrmions form tubes that are thought to nucleate and annihilate along their depth on points of vanishing magnetization. However, a lack of techniques that can probe the bulk of the material has made it difficult to perform experimental visualizations of skyrmion lattices and their stabilization through defects. An international team of researchers ( Canada, USA – NIST, SUNY Buffalo, Germany) provided three-dimensional visualizations of a bulk Co8Zn8Mn4 skyrmion lattice through a tomographic algorithm applied to multiprojection small-angle neutron scattering measurements. Reconstructions of the sample showed […]
Tag Archives: Magnetic skyrmions
Magnetic whirls pave the way for energy-efficient computing
Phys.org September 11, 2023 Magnetic skyrmions have garnered considerable interest due to a variety of electromagnetic responses that are governed by the topology. The topology that creates a microscopic gyro tropic force also causes detrimental effects, such as the skyrmion Hall effect, which is a well-studied phenomenon highlighting the influence of topology on the deterministic dynamics and drift motion. Furthermore, the gyrotropic force is anticipated to have a substantial impact on stochastic diffusive motion; however, the predicted repercussions have yet to be demonstrated, even qualitatively. An international team of researchers (Germany, Japan, Sweden, Czech Republic) demonstrated enhanced thermally activated diffusive […]
Magnetic skyrmions: Two methods for creating them and guiding their motion
Phys.org September 7, 2022 Magnetic skyrmions are envisioned as information carriers in future information technology. Skyrmions in thin magnetic films may act as an ideal test bed to study the dynamics of topologically non-trivial magnetic quasi-particles. To study the skyrmions reliable generation of the magnetic skyrmion at controlled positions is required. An international team of researchers (Germany, the Netherlands) developed full nanometer-scale control of the skyrmion generation by two independent approaches employing He+-ion irradiation or using backside reflective masks. The influence of nanopatterned backside aluminum masks on the optical excitation was studied in two sample geometries with varying layer sequence […]
Unlocking the recipe for designer magnetic particles for next generation computing technologies
Phys.org August 4, 2022 Recently ensembles of chiral spin textures, consisting of skyrmions and magnetic stripes, are shown to possess rich interactions with potential for device applications. However, several fundamental aspects of chiral spin texture phenomenology remain to be elucidated, including their domain wall (DW) structure, thermodynamic stability, and morphological transitions. An international team of researchers (Singapore, USA – Lawrence Berkeley National Laboratory) has shown the evolution of these textural characteristics unveiled on a tunable multilayer platform using a combination of full-field electron and soft X-ray microscopies with numerical simulations. They demonstrated the increasing chiral interactions, the emergence of Néel […]
Researchers create exotic magnetic structures with laser light
Phys.org April 25, 2022 To interface skyrmionics with electronic devices requires efficient and reliable ways of creating and destroying such excitations. An international team of researchers (Germany, USA – Flatiron Institute, Sweden) unravel the microscopic mechanism behind ultrafast skyrmion generation by femtosecond laser pulses in transition metal thin films. They employed a theoretical approach based on a two-band electronic model and showed that by exciting the itinerant electronic subsystem with a femtosecond laser ultrafast skyrmion nucleation can occur on a 100 fs timescale. By combining numerical simulations with an analytical treatment, they identified the coupling between electronic currents and the […]
The first high-speed straight motion of magnetic skyrmions at room temperature demonstrated
Phys.org November 19, 2019 The magnetic skyrmion can be driven by low current density and has a potential to be stabilized in nanoscale offering new directions of spintronics. However, there remain some fundamental issues in widely studied ferromagnetic systems which include a difficulty to realize stable ultra-small skyrmions at room temperature, presence of the skyrmion Hall effect, and limitation of velocity owing to the topological charge. Researchers in Japan have shown that skyrmion bubbles in a synthetic antiferromagnetic coupled multilayer are free from the above issues. Additive Dzyaloshinskii-Moriya interaction and spin-orbit torque (SOT) of the tailored stack allow stable skyrmion […]