Ferrite microwave detector

In treating the behavior of the magnetic moments of unbalanced electron spins in ferromagnetic materials under the action of an r-f field, second order terms in the alternating components are usually neglected. It is here shown that retention of certain second order terms for one component of the magnetization predicts the possibility of using ferrites to detect an amplitude modulated microwave signal. The demodulated envelope could be used to magnetostrict a long thin ferrite rod, the vibration of which can be observed by means of a polarized BaTio3ceramic rod. The results obtained with an experimental model of this device indicate verification of the theory. factors which are expected to improve performence are discussed.