Exciton-magnon effects in the optical spectrum of MnF2
Exciton and magnon absorption, emission spectra, and fluorescence of antiferromagnetic manganese fluoride
Greene, R. L.↗
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Temperature-dependent magnon-energy theory of FeF2 and MnF2
Magnon energy theory for temperature dependence of ferrous and magnesium fluorides antiferromagnetic- resonance frequency, sublattice magnetization and magnetic specific heat
Nagai, O.↗
Effects of size, shape, and frequency on the antiferromagnetic resonance linewidth of MnF2
Antiferromagnetic resonance measurement in manganese difluoride as function of microwave frequency, sample size and shape
Obrien, K. C.↗
Effects of size, shape, and frequency on the antiferromagnetic resonance linewidth of MnF
The research concerning the properties and application of solid state materials at submillimeter frequencies is summarized. Work reported includes: far infrared Fourier spectroscopy; studies of the antiferromagnetic resonance line in MnF2 at millimeter wavelengths; numerical solution of the equations of motion of a general two-sublattice antiferromagnet; study of antiferromagnetic resonance line in NiO powder; and resonance investigations of several indium thisospinels at millimeter wavelengths.
Obrien, K. C.↗
Surface sensitive photoemission EXAFS: A new structural tool
A new technique for surface EXAFS has been developed. In this technique the absorption fine structure is observed by monitoring the photoelectrons emitted from core levels as a function of photon energy. The surface sensitivity is achieved by detecting elastic photoelectrons that escape to the vacuum from a few atomic layers near the surface. EXAFS from Mn 3p and F2s outer core levels in MnF2 were measured, the results were compared with transmission EXAFS from Mn ls core level and good agreement was found. This development is significant because: (1) almost all elements have suitable core levels of low binding energy; (2) since photopeaks from adjacent core levels do not cross as the photon energy is varied, the limitations imposed on other surface EXAFS techniques by this interference is removed. Auger electrons, which have fixed kinetic energies and so can cross photopeaks, will generally have low energies if they originate from outer core levels and be unlikely to appear in the EXAFS region of kinetic energies, i.e., in excess of about 50 eV; (3) VUV light is used, which greatly extends the usable range of photon energies; (4) more than one element in a solid may be studied with the same monochromator. The experiments were carried out on the VUV beam line U14A at NSLS.
Choudhary, K. M.↗