Magnetic memory devices include a magnetoresistive cell including a free layer having a variable magnetization direction and a pinned layer having a fixed magnetization direction, a bit line on the magnetoresistive cell and including a spin Hall effect material layer exhibiting a spin Hall effect and contacting the free layer; and a lower electrode under the magnetoresistive cell. Further, the apparatus of the present invention solves problems ascribable to patches used to sense image density. The power converter also includes a controller circuit coupled to the energy transfer element and the input of the power converter to regulate the output of the power converter. The second portion extends or protracts from the first portion to allow the stent to deploy in a bifurcated vessel.