Nanowerk August 22, 2023 In topological materials the interaction between the bulk state and edge states can be tuned to manipulate edge transport behavior, especially in topological crystalline insulators (TCI) which have multiple degrees of topological protection. This can open opportunities for novel electronic and spintronic applications. Researchers in Australia investigated how bulk-edge interactions can influence the edge transport in planar bismuthene, a TCI with metallic edge states protected by in-plane mirror symmetry. By exploring the impact of various perturbation effects, such as device size, substrate potentials, and applied transverse electric field, they examined the evolution of the electronic structure […]
Tag Archives: Spintronic devices
Approaching the terahertz regime
Science Daily January 19, 2023 Tunnelling magnetoresistance (TMR) is considered to be proportional to spin polarization at the interface and has been studied primarily in ferromagnets. An international team of researchers (Japan, Canada) observed TMR in an all-antiferromagnetic tunnel junction consisting of Mn3Sn/MgO/Mn3Sn. They made measurements using a Fe/MgO/Mn3Sn MTJ and showed that the sign and direction of anisotropic longitudinal spin-polarized current in the antiferromagnet can be controlled by octupole direction. They measured a TMR ratio of around 2% at room temperature, which arises between the parallel and antiparallel configurations of the cluster magnetic octupoles in the chiral antiferromagnetic state. […]
The discovery of interfacial ferromagnetism in 2D antiferromagnet heterostructures
Nanowerk December 27, 2022 Combining two different magnetic orders and investigating the magnetic proximity at the interface remains largely unexplored. An international team of researchers (Japan, USA – Purdue University, research org, Pennsylvania State University, Denmark, China) studied the heterostructures of layered antiferromagnets, CrI3 and CrCl3 to characterize the magnetic behaviors down to a few atomic layers. They observed an emergent interfacial ferromagnetism when bringing these two antiferromagnets together, with an even higher critical temperature than both the constituent materials. They demonstrated that an out-of-plane magnetic order was established in the CrCl3 layer proximal to CrI3. The interfacial magnetism showed […]
Physicists have developed a new photonic system with electrically tuned topological features
Phys.org October 14, 2022 In optoelectronics momentum and polarization degrees of freedom of light are interwoven and interfaced with electronics. However, manipulating photons through electrical means is a daunting task given their charge neutrality. An international team of researchers (Poland, Iceland, Italy) has developed electrically tunable microcavity exciton-polariton resonances in a Rashba-Dresselhaus spin-orbit coupling field. They showed that different spin-orbit coupling fields and the reduced cavity symmetry led to tunable formation of the Berry curvature, the hallmark of quantum geometrical effects. They implemented an architecture of a photonic structure with a two-dimensional perovskite layer incorporated into a microcavity filled with […]
Breakthrough for efficient and high-speed spintronic devices
Science Daily April 25, 2022 How the spin evolves in the nanoworld on extremely short time scales, in one millionth of one billionth of a second, has remained largely mysterious. An international team of researchers (Austria, Canada, Germany, Switzerland, France, China) used a tabletop ultrafast soft X-ray microscope based on a high-energy Ytterbium laser to spatio-temporally resolve the spin dynamics inside rare earth materials. They recorded a series of snapshot images of the nanoscale rare earth magnetic structures providing rich information on the magnetic properties that are as accurate as those obtained using large-scale X-ray facilities. According to the researchers […]