Title :
Submillimeter backward-wave oscillator spectroscopy of the rare-earth orthoferrites
Author :
Kozlov, G.V. ; Lebedev, S.P. ; Mukhin, A.A. ; Prokhorov, A.S. ; Fedorov, L.V. ; Balbashov, A.M. ; Parsegov, I.Yu.
Author_Institution :
Inst. of Gen. Phys., Acad. of Sci., Moscow, Russia
fDate :
11/1/1993 12:00:00 AM
Abstract :
The complex dielectric permittivity and the complex magnetic permeability of the orthoferrites RFeO3 (R=Y, Tm, Dy, Gd, Ho, Er, Tb) and Y1-xLuxFeO3 have been investigated at submillimeter wavelengths v=100-1000 GHz. The parameters of the two antiferromagnetic resonance modes (resonance frequencies, linewidths, and mode contributions to the static permeability) have been obtained. The authors observed the electronic transitions inside the TM3+, Er3+, Ho3+ ground multiplets and found a strong influence of this excitation on the AFMR mode behavior. A permittivity increase (up to 30%) in TmFeO3 resulting from the electrodipolar transitions in Tm3+ was observed
Keywords :
antiferromagnetic properties of substances; antiferromagnetic resonance; ferrites; magnetic permeability; permittivity; rare earth compounds; spin dynamics; weak ferromagnetism; 100 to 1000 GHz; DyFeO3; ErFeO3; GdFeO3; HoFeO3; TbFeO3; TmFeO3; Y1-xLuxFeO3; YFeO3; antiferromagnetic resonance modes; backward-wave oscillator spectroscopy; complex dielectric permittivity; complex magnetic permeability; electrodipolar transitions; electronic transitions; ground multiplets; linewidths; mode contributions; rare-earth orthoferrites; resonance frequencies; spin dynamics; spin reorientation phase transitions; static permeability; submillimeter wavelengths; weak ferromagnets; Absorption; Crystals; Dielectrics; Frequency measurement; Interference; Magnetic resonance; Optical receivers; Oscillators; Permeability; Spectroscopy;
Journal_Title :
Magnetics, IEEE Transactions on
