Accession Number : AD0674865

Title :   MULTI-MAGNON ABSORPTION IN MNF2.1. THE FAR INFRARED SPECTRUM.

Descriptive Note : Technical rept.,

Corporate Author : MCGILL UNIV LONGUEUIL (QUEBEC) MAGNET LAB

Personal Author(s) : Shapiro,Marvin M. ; Stevenson,Richard

Report Date : 21 JUN 1968

Pagination or Media Count : 28

Abstract : The far infrared absorption spectrum of a thin crystal of MnF2 at 4.2K and 80K was observed in the region 40/cm to 360/cm. The spectrum consists of many sharp lines superimposed on a broad background of phonon origin. The sharp lines are interpreted as being due to processes in which multi-magnons are created, sometimes accompanied by either the creation or absorption of standing elastic waves. At 4.2K, up to 6 magnons are created simultaneously. At 80K, multi-magnons are created in the ordered surface layers of the crystal with energies nearly identical to those of the 4.2K magnons. Weak bulk multi-magnons are also observed at 80K with appropriate lower energies. (Author)

Descriptors :   (*MAGNETIC MATERIALS, ABSORPTION SPECTRA), (*MANGANESE COMPOUNDS, *INFRARED SPECTROSCOPY), FLUORIDES, PHONONS, MECHANICAL WAVES, CRYSTAL LATTICES, MAGNETIC MOMENTS, SPINNING(MOTION), CANADA

Subject Categories : Electricity and Magnetism
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE