反铁磁板中自旋行波的电磁辐射。精确解
Electromagnetic radiation of the travelling spin wave propagating in an antiferromagnetic plate. Exact solution
摘要：
本文给出了自旋波在反铁磁（AFM）平板中传播时辐射问题的精确解，考虑了反铁磁矢量面内振荡的自旋波。在这种情况下，磁化矢量垂直于AFM板振荡，并且像行波一样取决于时间和平面坐标。该模型可以获得赫兹矢量的精确解析表达式，从而也可以获得推迟势和场强。结果表明，所得到的表达式描述了由行波引起的切伦科夫辐射。如果相速度超过光速，则辐射的电磁波是TEM类型。否则，电场和磁场值在垂直于板的方向上呈指数减小。并对能量损失进行了评估。
英文摘要：
The exact solution of radiation problem of a spin wave travelling in an antiferromagnetic (AFM) plate was found. The spin wave with in-plane oscillations of antiferromagnetism vector was considered. In this case the magnetization vector is oscillating being perpendicular to the AFM plate and depends on time and plane coordinates as travelling wave does. This model allows to obtain exact analytical expression for Hertzian vector and, consequently, the retarded potentials and field strengths as well. It is shown that expressions obtained describe Cherenkov radiation caused by the travelling wave. The radiated electromagnetic wave is the TEM type if a phase velocity exceeds the speed of light. Otherwise electric and magnetic field values exponentially decrease in the direction normal to the plate. The energy losses were evaluated also.
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