Fastener device for fastening a panel to a structure, and an aircraft

A fastener device for fastening a panel to a structure, the fastener device being provided with at least one reversible fastener assembly including a movable stud suitable for being fastened to the panel and a stationary stud suitable for being fastened to the structure, the movable stud including first magnetization means co-operating with second magnetization means of the stationary stud, at least one of the first and second magnetization means including a magnet, wherein one magnetization means is carried by a ball joint of the associated stud, each magnetization means being connected to movement means that move the magnetization means from an engagement position to a disengagement position in translation and in reversible manner, a movement means named “first movement means” of the movable stud moving the first magnetization means in translation in a plane, and a movement means named “second movement means” of the stationary stud moving the second magnetization means in translation along a longitudinal axis of the stationary stud that is substantially orthogonal to the plane, the first and second magnetization means being strongly magnetically attracted to each other when they are facing and each is in the engagement position, and being magnetically attracted only slightly or not at all when at least one magnetization means is in the disengagement position.