Parallel Pumping in Ferromagnetic Resonance Transmission?

Abstract

so that the conductivity o(oo) can be expressed as aM = a(0)/[l+uoT(a>)](6) 1/T(U)) is found to be of the form of Eq. (4) with T'^O)) given approximately by r ml (u))^\B(Hu)/nk) 2~0 .94xiO 10 sec" 1 (7)at 891 GHz . The observed enhancement of the relaxation rate at 891 GHz (with consideration of nonlocal effects) is about 60% greater than predicted by Eq. (7). The significance of the discrepancy is questionable because of the crudeness of the model calculation. However, such a deviation is of interest as it would suggest a phonon-mediated (BCS) electron-electron coupling in which A fe is energy dependent. The authors thank R. E. Prange, J. F. Koch, and S. M. Bhagat for many helpful discussions, as well as Scott Brownstein and Clyde Bradley for valuable assistance in the laser design and construction. 1 P. Goy and G. Weisbuch, Phys. Rev. Lett. £5, 225 (1970). 2 V. S. Edel'man and S. M. Cheremisin, Pis'ma Zh.A distinctive and strong microwave magnetic transmission resonance mode is reported in ferromagnetic Gd, Fe, and Ni when the static magnetic field is parallel both to the sample foil surface and to the microwave magnetic field. Some evidence exists to show that this may involve sensitive detection of two-magnon processes as in parallel pumping.