Tuneable spin torque device for generating an oscillating signal and method for tuning

Are the equipment and the method for controlling magnetization of a magnetic element by ultra high-speed, and equipment (100) A surface-acoustic-waves generating means (102), It has the transport layer (104) typically prepared in the above-mentioned SAW generating means (102) structurally functionally and partially, and at least one ferromagnetic element (106). Surface acoustic waves spread the inside of the transport layer (104) which consists of piezoelectric material typically, after being generated. Thereby, distortion occurs in the ferromagnetic element (106) in contact with a transport layer (104) and a transport layer (104). This distortion generates an effective field in a ferromagnetic element (106) by magnetoelastic coupling. When surface acoustic waves have the frequency close to substance in ferromagnetic resonance (FMR) frequency, a ferromagnetic element (106) is fully absorbed and the magnetization state of an element is controlled by FMR frequency. Equipment is used for RF magnetism resonator, a sensor, a camera, etc. A corresponding method is used for ultra high-speed read-out and change in a magnetic element and a magnetic logic element.