Patent ID: 7764136

Claim:
A strip line integrated microwave generating element comprising: (1) a strip line having a signal electrode and a ground electrode, and (2) the microwave generating element having a magnetic tunnel junction structure which comprises a magnetization fixed layer formed of a ferromagnetic material; a MgO tunnel barrier layer; and a magnetization free layer formed of a ferromagnetic material, the microwave generating element being smaller than the electrodes and being mounted on a part of the signal electrode or the ground electrode, the magnetization fixed layer of the microwave generating element being in contact with either one of the signal electrode and the ground electrode while the magnetization free layer of the element being in contact with the other, MR ratio of the microwave generating element being of 100% or more, a resistance value of the microwave generating element being from 50Ω to 300Ω, the resistance of the microwave generating element matching with an impedance of the strip line, and a size of the microwave generating element being such that the magnetization free layer can form a single magnetic domain and being 200 nm square or smaller in cross-sectional area in a layer plan direction.