Researchers find potential solution to overheating mobile phones  November 29, 2019 Widespread applications of magnetic devices require an efficient means to manipulate the local magnetization. An international team of researchers (Singapore, South Korea) has experimentally demonstrated an alternative approach based on magnon currents and achieved magnon-torque–induced magnetization switching in Bi2Se3/antiferromagnetic insulator NiO/ferromagnet devices at room temperature. The magnon currents carry spin angular momentum efficiently without involving moving electrons through a 25-nanometer-thick NiO layer. The magnon torque is sufficient to control the magnetization. This research, which is relevant to the energy-efficient control of spintronic devices, will invigorate magnon-based memory and logic devices…read more. TECHNICAL ARTICLE 

Magnonic devices can replace electronics without much noise  March 4, 2019 Researchers at UC Riverside created a chip that generated spin wave between transmitting and receiving antennae. They showed that the low-frequency noise of magnonic devices is dominated by the random telegraph signal noise rather than 1/f noise. It was also found that the noise level of surface magnons depends strongly on the power level, increasing sharply at the on-set of nonlinear dissipation. The presence of the random telegraph signal noise suggests that the current fluctuations involve random discrete macro events caused by an individual macro-scale fluctuator. The findings may help in developing the next generation of […]