Patent ID: 8598957

Claim:
An oscillator, comprising: a base free layer having a variable magnetization direction; a plurality of oscillation units on the base free layer; a current source commonly connected to a plurality of regions of the base free layer, which correspond to the plurality of the oscillation units, respectively; a capacitor connected to a wiring that connects the current source and the base free layer; and a spectrum analyzer connected to the capacitor, wherein the oscillation units each include, a free layer element contacting a first surface of the base free layer and having a width less than a width of the base free layer, a pinned layer element separated from the free layer element and having a fixed magnetization direction, and separation layer element between the free layer element and the pinned layer element, wherein the first surface of the base free layer has a width greater than the width of the free layer element so that a portion of the first surface of the base free layer around the free layer element is not covered by the free layer element.