Theory of Magnetic Excitations in Random Antiferromagnets. I. Antiferromagnetic Resonance
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A theory for obtaining the dynamic susceptibility z(co, H) of rancl[om magnetsis developed by using distribution fuuactiouas and applied to analyses; of the anti-ferromagnetic resonance of dilute magnets and mixtures of two magnetic ions.It is shown that z ' (w, 0) of the dilute magnet with small anisotropy exhibitsa 'single resonant peak which decreases ita frequency with concentration of nag-netic ions, while .that with large anisotropy exhibits some peaks vzhich do notdecrease in frequency but change their intensities with decreasing c<>ncentration.On the other hatad, z ' (a, 0) of the mixture generally exhibits twc>peaks withstructure. Our results are found to be qualitatively in good agr'eement withrecent experimental dxta for T.S.=.F. and KbzT,53-.F,z, where 7'=Mn or Coand .S'=Z11,' Mg, Co or Ni.
- 社団法人日本物理学会の論文
- 1980-07-15
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