Nonreciprocal collective magnetostatic wave modes in geometrically asymmetric bilayer structure with nonmagnetic spacer.

Nonreciprocity, inequivalence in amplitudes and frequencies of spin waves propagating in opposite directions, is a key property underlying functionality in prospective magnonic devices. Here we demonstrate experimentally and theoretically a simple approach to induce frequency nonreciprocity in a magnetostatically coupled ferromagnetic bilayer structure with a nonmagnetic spacer by its geometrical asymmetry. Using Brillouin light scattering, we show the formation of two collective spin wave modes in FeGa/Cu/FeGa structure with different thicknesses of ferromagnetic layers.

[Treatment of complications following esophageal electrochemical burns by batteries in children].

Objective: To determine the optimal treatment of patients with complications of esophageal electrochemical burns by batteries.

Material And Methods: There were 75 children with esophageal electrochemical burns by batteries between 2010 and 2019. All children underwent X-ray of the cervical spine, chest and abdomen, esophagoscopy with removal of the battery, tracheoscopy.

Author Correction: Chronicles of nature calendar, a long-term and large-scale multitaxon database on phenology.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Chronicles of nature calendar, a long-term and large-scale multitaxon database on phenology.

We present an extensive, large-scale, long-term and multitaxon database on phenological and climatic variation, involving 506,186 observation dates acquired in 471 localities in Russian Federation, Ukraine, Uzbekistan, Belarus and Kyrgyzstan. The data cover the period 1890-2018, with 96% of the data being from 1960 onwards. The database is rich in plants, birds and climatic events, but also includes insects, amphibians, reptiles and fungi.