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 stud named “movable stud” suitable for being fastened to the panel and a stud named “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 at least one magnetization means is carried by a ball joint of the associated stud, each magnetization means being constrained to move in translation with movement means so as to be moved in translation in reversible manner along a longitudinal axis of the associated stud from an engagement position to a disengagement position, the longitudinal axis of the movable stud being referred to as the “first longitudinal axis” and being substantially parallel to the longitudinal axis of the stationary stud, referred to as the “second longitudinal axis”, the 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.