A method of operating a magnetic memory device including an MTJ structure, a first conductive line, a second conductive line, and a switching device, the MTJ structure having a cylindrical shape, a conductive layer at a center, an insulating layer co-axially formed around the conductive layer, and a material layer having a plurality of magnetic layers that are formed around the insulating layer in a co-axial relationship with the conductive layer, the method comprising:
- applying a current to one of the first and second conductive lines after floating another one of the first and second conductive lines.