Magnetic behaviors of HTS bulk components in hybrid magnetic circuit

Melt texturing large-grain HTS material has evolved in the last few years into a technology capable of producing large quantities of high-performance superconducting bulk materials. Such materials are used for developing novel engineering devices. In order to clarify magnetic behaviors of HTS bulks in a magnetic circuit, magnetization, magnetic relaxation and the levitation force were measured for the HTS combined bulks with and without soft iron. Experimental observations and theoretical analyzes indicate that the induced proximity current would modify flux diffusion and the screening-current distribution inside, resulting in the change of magnetic behaviors such as the trapped field and the levitation force. Well-designed soft-iron layers would be helpful to enhance the magnetic stability and strengthen the HTS combined bulks. An alternative method is provided to optimize flux configurations in HTS electromagnetic devices.