INVESTIGATION OF DEPENDENCE OF MICROWAVE HARMONIC GENERATION UPON NON-LINEARITIES IN FERRIMAGNETIC MATERIALS.
Abstract
Two aspects of the non-linear response of ferromagnetically coupled spin systems to microwaves were studied. Small signal non-linearities in spherical samples are shown to be very sensitive to the internal anisotropy fields. General expressions for the harmonic response of the magnetization are derived and shown to agree with the experimental observation of yttrium iron garnet spheres. At signal levels above the onset of spin wave excitation, unstable response of the spin system is observed. Experimental observations indicate that this instability, which is usually periodic, is associated with changes in the value of macroscopic magnetization M. The implications of this are discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 15, 1961
- Accession Number
- AD0267882
Entities
People
- Gabriel F. Herrmann
- Robert M. Hill
- Robert S. Bergman