Effect of Premagnetization on Self-Stable Force Characteristics in a Space Superconducting Interface Structure

Under the condition of field-cooling magnetization, the superconductor can trap magnetic flux and form a self-stabilizing state within it because of the flux-pinning effect. In most cases, the superconductor interacts with a magnet that is also used to magnetize the superconductor, and then, some self-stabilizing structure such as the magnet–superconductor suspension is achieved for application. However, in some actual applications, such as the space superconducting interface, the superconductor has to be magnetized by some background magnets and then interacts with other magnets, which is called premagnetization; hence, the self-stability between the magnetized superconductor and the interacting magnet should be different. To investigate self-stabilizing properties after premagnetization, an experiment is designed to study quasi-static force characteristics between a permanent magnet and an YBCO superconductor magnetized by a superconducting coil. Through comparing the experimental results in different premagnetization conditions, we found that the force characteristics in these conditions are obviously different because of the difference of the magnetic field distribution in the magnetized superconductor. These force properties can be affected by changing the magnetization current and the position of the superconducting coil. With reasonable adjustments, the on-site premagnetization can realize strong self-stabilizing characteristics for the space interface.