Сейчас наиболее перспективными считают материалы, в которых одновременно с изменением магнитного состояния происходит структурное изменение, или просто резкое изменение объема.
Now consider the most promising materials simultaneously with the change in the magnetic state occurs a structural change, or simply a sharp change in volume.
Now consider the most promising materials in which simultaneously with the change of magnetic state occurs structural changes, or dramatic change in volume.
now consider the most promising materials in which the magnetic condition occurs simultaneously with the change of structural change, or just a change of volume.