Chen Wu is an Associate Professor of the School of Materials Science and Engineering at Zhejiang University. She has completed D.Phil. and post-doctorate research in Materials Science at the University of Oxford. Her research interest lies in the design, fabrication and manipulation of magnetic composites and their wide frequency applications. Jiaying Jin is an Associate Professor of the School of Materials Science and Engineering at Zhejiang University. Her main research interest is the magnetism and permanent magnetic materials.