Magnetic apparatus for MRIMRT probes and methods for construction thereof are disclosed. The structure may be locked in a position determined by the inner dimensions of the well in which it is deployed. An electric field is applied to the liquid crystal layer exhibiting a blue phase by using the pixel electrode that has an inclination and the electrode corresponding to the pixel electrode, which also has an inclination. The slide block includes a second engaging hook for engaging the second engaging groove, and a press portion exposed through the through hole and pressible to enable the second engaging hook to disengage from the second engaging groove.